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3. Recovery of dialysis patients with COVID-19: health outcomes 3 months after diagnosis in ERACODA

Author

Hemmelder, M. H., Noordzij, M., Vart, P., Hilbrands, L. B., Jager, K. J., Abrahams, A. C., Arroyo, D., Battaglia, Y., Ekart, R., Mallamaci, F., Malloney, S. -R., Oliveira, J., Rydzewski, A., Sridharan, S., Vogt, L., Duivenvoorden, R., Gansevoort, R. T., Franssen, C. F. M., van der Net, J. B., Essig, M., du Buf-Vereijken, P. W. G., van Ginneken, B., Maas, N., van Jaarsveld, B. C., Bemelman, F. J., Klingenberg-Salahova, F., Heenan-Vos, F., Vervloet, M. G., Nurmohamed, A., Abramowicz, D., Verhofstede, S., Maoujoud, O., Malfait, T., Fialova, J., Melilli, E., Fava, A., Cruzado, J. M., Perez, N. M., Lips, J., Krepel, H., Adilovic, H., Hengst, M., Konings, C. J. A. M., Braconnier, P., Weis, D., Gellert, R., Alferes, D. G., Radulescu, D., Zakharova, E. V., Ambuehl, P. M., Guidotti, R., Walker, A., Lepeytre, F., Rabate, C., Rostoker, G., Marques, S., Azasevac, T., Majstorovic, G. S., Katicic, D., Dam, M. T., Kruger, T., Brzosko, S., Liakopoulos, V., Zanen, A. L., Logtenberg, S. J. J., Fricke, L., Kuryata, O., Slebe, J. J. P., Abd ElHafeez, S., Kemlin, D., van de Wetering, J., Reinders, M. E. J., Hesselink, D. A., van Gestel, J. K., Eiselt, J., Kielberger, L., El-Wakil, H. S., Verhoeven, M. A. M., Logan, I., Canal, C., Facundo, C., Ramos, A. M., Debska-Slizien, A., Veldhuizen, N. M. H., Tigka, E., Polyzou Konsta, M. A., Panagoutsos, S., Postorino, A., Cambareri, F., Matceac, I., Nistor, I., Covic, A., Groeneveld, J. H. M., Jousma, J., Diekmann, F., Oppenheimer, F., Blasco, M., Pereira, T. A., dos Santos Junior, A. C. S., Arias-Cabrales, C., Crespo, M., Llinas-Mallol, L., Buxeda, A., Tarrega, C. B., Redondo-Pachon, D., Arenas Jimenez, M. D., Mendoza-Valderrey, A., Martins, A. C., Mateus, C., Alvila, G., Laranjinha, I., Hofstra, J. M., Siezenga, M. A., Franco, A., Castellano, S., Rodriguez-Ferrero, M. L., Manzanos, S. B., Haridian Sosa Barrios, R., Lemahieu, W., Bartelet, K., Dirim, A. B., Demir, E., Sever, M. S., Turkmen, A., Safak, S., Hollander, D. A. M. J., Kerckhoffs, A., Buttner, S., de Vries, A. P. J., Meziyerh, S., van der Helm, D., Mallat, M., Bouwsma, H., Petruliene, K., Verberk, I., van der Sande, F. M., Christiaans, M. H. L., Mohankumar, N., Luca, M. D., Tuglular, S. Z., Kramer, A., Beerenhout, C., Luik, P. T., Kerschbaum, J., Tiefenthaler, M., Watschinger, B., Adema, A. Y., Stepanov, V. A., Zulkarnaev, A. B., Turkmen, K., Gandolfini, I., Maggiore, U., Fliedner, A., Asberg, A., Mjoen, G., Miyasato, H., de Fijter, C. W. H., Mongera, N., Pini, S., de Biase, C., van de Logt, A. E., Maas, R., Lebedeva, O., Lopez, V., Reichert, L. J. M., Verhave, J., Titov, D., Parshina, E. V., Zanoli, L., Marcantoni, C., van Kempen, G., van Gils-Verrij, L. E. A., Harty, J. C., Meurs, M., Myslak, M., Lentini, P., den Deurwaarder, E., Stendahl, M., Rahimzadeh, H., Schouten, M., Rychlik, I., Cabezas-Reina, C. J., Roca, A. M., Nauta, F., Sahin, I., Goffin, E., Kanaan, N., Labriola, L., Devresse, A., Diaz-Mareque, A., Coca, A., de Arriba, G., Meijers, B. K. I., Naesens, M., Kuypers, D., Desschans, B., Tonnerlier, A., Wissing, K. M., Dedinska, I., Pessolano, G., Malik, S., Dounousi, E., Papachristou, E., Berger, S. P., Meijer, E., Sanders, J. S. F., Ozyilmaz, A., Ponikvar, J. B., Pernat, A. M., Kovac, D., Arnol, M., Molenaar, F. M., van Zuilen, A. D., Meijvis, S. C. A., Dolmans, H., Tantisattamo, E., Esposito, P., Krzesinski, J. -M., Barahira, J. D., Gallieni, M., Martin-Moreno, P. L., Guglielmetti, G., Guzzo, G., Toapanta, N., Soler, M. J., Luik, A. J., van Kuijk, W. H. M., Stikkelbroeck, L. W. H., Hermans, M. M. H., Rimsevicius, L., Righetti, M., Islam, M., Heitink-Ter Braak, N., Nephrology, ACS - Microcirculation, ACS - Diabetes & metabolism, UCL - SSS/IREC/NEFR - Pôle de Néphrologie, UCL - (SLuc) Service de néphrologie, Clinical sciences, Faculteit Medische Wetenschappen/UMCG, Groningen Kidney Center (GKC), Cardiovascular Centre (CVC), Groningen Institute for Organ Transplantation (GIOT), Interne Geneeskunde, RS: Carim - V02 Hypertension and target organ damage, Medical Informatics, APH - Aging & Later Life, APH - Quality of Care, APH - Global Health, ACS - Pulmonary hypertension & thrombosis, APH - Health Behaviors & Chronic Diseases, and Internal Medicine

Subjects
Male, Outcome Assessment, survival, mental health status, COVID-19 Testing, SDG 3 - Good Health and Well-being, Renal Dialysis, functional health status, Outcome Assessment, Health Care, 80 and over, Humans, KIDNEY-TRANSPLANT, AcademicSubjects/MED00340, Aged, Aged, 80 and over, Transplantation, SARS-CoV-2, MORTALITY, COVID-19, Middle Aged, Health Care, Intensive Care Units, Renal disorders Radboud Institute for Molecular Life Sciences [Radboudumc 11], Nephrology, dialysis, Original Article, Female, Renal disorders Radboud Institute for Health Sciences [Radboudumc 11]
Abstract

Background Coronavirus disease 2019 (COVID-19)-related short-term mortality is high in dialysis patients, but longer-term outcomes are largely unknown. We therefore assessed patient recovery in a large cohort of dialysis patients 3 months after their COVID-19 diagnosis. Methods We analyzed data on dialysis patients diagnosed with COVID-19 from 1 February 2020 to 31 March 2021 from the European Renal Association COVID-19 Database (ERACODA). The outcomes studied were patient survival, residence and functional and mental health status (estimated by their treating physician) 3 months after COVID-19 diagnosis. Complete follow-up data were available for 854 surviving patients. Patient characteristics associated with recovery were analyzed using logistic regression. Results In 2449 hemodialysis patients (mean ± SD age 67.5 ± 14.4 years, 62% male), survival probabilities at 3 months after COVID-19 diagnosis were 90% for nonhospitalized patients (n = 1087), 73% for patients admitted to the hospital but not to an intensive care unit (ICU) (n = 1165) and 40% for those admitted to an ICU (n = 197). Patient survival hardly decreased between 28 days and 3 months after COVID-19 diagnosis. At 3 months, 87% functioned at their pre-existent functional and 94% at their pre-existent mental level. Only few of the surviving patients were still admitted to the hospital (0.8–6.3%) or a nursing home (∼5%). A higher age and frailty score at presentation and ICU admission were associated with worse functional outcome. Conclusions Mortality between 28 days and 3 months after COVID-19 diagnosis was low and the majority of patients who survived COVID-19 recovered to their pre-existent functional and mental health level at 3 months after diagnosis.

Published
2022

4. Clinical triage of patients on kidney replacement therapy presenting with COVID-19: An ERACODA registry analysis

Author

Mitra, S., Jayanti, A., Vart, P., Coca, A., Gallieni, M., Ovrehus, M. A., Midtvedt, K., Abd Elhafeez, S., Gandolfini, I., Buttner, S., Franssen, C. F. M., Hemmelder, M. H., Van Der Net, J. B., Essig, M., Du Buf-Vereijken, P. W. G., Van Ginneken, B., Maas, N., Vogt, L., Van Jaarsveld, B. C., Jager, K. J., Bemelman, F. J., Klingenberg-Salahova, F., Heenan-Vos, F., Vervloet, M. G., Nurmohamed, A., Abramowicz, D., Verhofstede, S., Maoujoud, O., Malfait, T., Fialova, J., Melilli, E., Fava, A., Cruzado, J. M., Perez, N. M., Lips, J., Krepel, H., Adilovic, H., Hengst, M., Rydzewski, A., Gellert, R., Oliveira, J., Alferes, D. G., Zakharova, E. V., Ambuehl, P. M., Walker, A., Winzeler, R., Lepeytre, F., Rabate, C., Rostoker, G., Marques, S., Azasevac, T., Katicic, D., Dam, M. T., Kruger, T., Brzosko, S., Zanen, A. L., Logtenberg, S. J. J., Fricke, L., Slebe, J. J. P., Kemlin, D., Van De Wetering, J., Reinders, M. E. J., Eiselt, J., Kielberger, L., El-Wakil, H. S., Verhoeven, M. A. M., Canal, C., Facundo, C., Ramos, A. M., Debska-Slizien, A., Veldhuizen, N. M. H., Tigka, E., Konsta, M. A. P., Panagoutsos, S., Mallamaci, F., Postorino, A., Cambareri, F., Covic, A., Matceac, I., Nistor, I., Cordos, M., Groeneveld, J. H. M., Jousma, J., Marjolijn Van Buren, Diekmann, F., Tiago Assis Pereira, Santos, A. C. S., Arias-Cabrales, C., Crespo, M., Llinas-Mallol, L., Buxeda, A., Tarrega, C. B., Redondo-Pachon, D., Jimenez, M. D. A., Hofstra, J. M., Franco, A., Arroyo, D., Rodriguez-Ferrero, M. L., Manzanos, S. B., Barrios, R. H. S., Avila, G., Laranjinha, I., Mateus, C., Lemahieu, W., Bartelet, K., Dirim, A. B., Sever, M. S., Demir, E., Safak, S., Turkmen, A., Hollander, D. A. M. J., De Vries, A. P. J., Meziyerh, S., Van Der Helm, D., Mallat, M., Bouwsma, H., Sridharan, S., Petruliene, K., Maloney, S. -R., Verberk, I., Van Der Sande, F. M., Christiaans, M. H. L., Mohankumar, N., Di Luca, M., Tuglular, S. Z., Kramer, A., Beerenhout, C., Luik, P. T., Kerschbaum, J., Tiefenthaler, M., Watschinger, B., Adema, A. Y., Stepanov, V. A., Zulkarnaev, A. B., Turkmen, K., Fliedner, A., Asberg, A., Mjoen, G., Miyasato, H., De Fijter, C. W. H., Mongera, N., Pini, S., De Biase, C., Duivenvoorden, R., Hilbrands, L., Kerckhoffs, A., Van De Logt, A. -E., Maas, R., Lebedeva, O., Lopez, V., Verhave, J., Reichert, L. J. M., Titov, D., Parshina, E. V., Zanoli, L., Marcantoni, C., Van Gils-Verrij, L. E. A., Harty, J. C., Meurs, M., Myslak, M., Battaglia, Y., Lentini, P., Den Deurwaarder, E., Stendahl, M., Rahimzadeh, H., Schouten, M., Rychlik, I., Cabezas-Reina, C. J., Roca, A. M., Nauta, F., Goffin, E., Kanaan, N., Labriola, L., Devresse, A., Diaz-Mareque, A., Meijers, B. K. I., Naesens, M., Kuypers, D., Desschans, B., Tonnelier, A., Wissing, K. M., De Arriba, G., Dedinska, I., Pessolano, G., Maggiore, U., Malik, S., Papachristou, E., Gansevoort, R. T., Noordzij, M., Berger, S. P., Meijer, E., Ozyilmaz, A., Sanders, J. S. F., Ponikvar, J. B., Arnol, M., Pernat, A. M., Kovac, D., Ekart, R., Abrahams, A. C., Molenaar, F. M., Van Zuilen, A. D., Meijvis, S. C. A., Dolmans, H., Tantisattamo, E., Esposito, P., Krzesinski, J. -M., Barahira, J. D., Sabiu, G., Martin-Moreno, P. L., Guglielmetti, G., Guzzo, G., Toapanta, N., Soler, M. J., Luik, A. J., Van Kuijk, W. H. M., Stikkelbroeck, L. W. H., Hermans, M. M. H., Rimsevicius, L., Righetti, M., Islam, M., Braak, N. H. -T., Nephrology, UCL - SSS/IREC/NEFR - Pôle de Néphrologie, UCL - (SLuc) Service de néphrologie, Interne Geneeskunde, RS: Carim - V02 Hypertension and target organ damage, Groningen Kidney Center (GKC), ACS - Diabetes & metabolism, AII - Inflammatory diseases, AII - Infectious diseases, Internal Medicine, and Clinical sciences

Subjects
kidney, medicine.medical_specialty, Coronavirus disease 2019 (COVID-19), medicine.medical_treatment, Pulmonary insufficiency, infectious diseases, Kidney, Second presentation, Interquartile range, Internal medicine, medicine, Humans, Registries, Mortality, AcademicSubjects/MED00340, Dialysis, Aged, Transplantation, second presentation, business.industry, SARS-CoV-2, COVID-19, medicine.disease, mortality, Triage, Hospitalization, Renal Replacement Therapy, Renal disorders Radboud Institute for Molecular Life Sciences [Radboudumc 11], Nephrology, Oxygen Saturation, dialysis, Original Article, Hemodialysis, Renal disorders Radboud Institute for Health Sciences [Radboudumc 11], Presentation (obstetrics), business, transplantation
Abstract

Background Patients on kidney replacement therapy (KRT) are at very high risk of coronavirus disease 2019 (COVID-19). The triage pathway for KRT patients presenting to hospitals with varying severity of COVID-19 illness remains ill-defined. We studied the clinical characteristics of patients at initial and subsequent hospital presentations and the impact on patient outcomes. Methods The European Renal Association COVID-19 Database (ERACODA) was analysed for clinical and laboratory features of 1423 KRT patients with COVID-19 either hospitalized or non-hospitalized at initial triage and those re-presenting a second time. Predictors of outcomes (hospitalization, 28-day mortality) were then determined for all those not hospitalized at initial triage. Results Among 1423 KRT patients with COVID-19 [haemodialysis (HD), n = 1017; transplant, n = 406), 25% (n = 355) were not hospitalized at first presentation due to mild illness (30% HD, 13% transplant). Of the non-hospitalized patients, only 10% (n = 36) re-presented a second time, with a 5-day median interval between the two presentations (interquartile range 2–7 days). Patients who re-presented had worsening respiratory symptoms, a decrease in oxygen saturation (97% versus 90%) and an increase in C-reactive protein (26 versus 73 mg/L) and were older (72 vs 63 years) compared with those who did not return a second time. The 28-day mortality between early admission (at first presentation) and deferred admission (at second presentation) was not significantly different (29% versus 25%; P = 0.6). Older age, prior smoking history, higher clinical frailty score and self-reported shortness of breath at first presentation were identified as risk predictors of mortality when re-presenting after discharge at initial triage. Conclusions This study provides evidence that KRT patients with COVID-19 and mild illness can be managed effectively with supported outpatient care and with vigilance of respiratory symptoms, especially in those with risk factors for poor outcomes. Our findings support a risk-stratified clinical approach to admissions and discharges of KRT patients presenting with COVID-19 to aid clinical triage and optimize resource utilization during the ongoing pandemic.

Published
2021

11. Study of an Isolated Substorm with ISTP Data

Author

Lui, A. T. Y., primary, Williams, D. J., additional, Mcentire, R. W., additional, Ohtani, S., additional, Zanetti, L. J., additional, Bristow, W. A., additional, Greenwald, R. A., additional, Newell, P. T., additional, Christen, S. P., additional, Mukai, T., additional, Tsurada, K., additional, Yamamoto, T., additional, Kokubun, S., additional, Matsumoto, H., additional, Kojima, H., additional, Murata, T., additional, Fairfield, D. H., additional, Lepping, R. P., additional, Samson, J. C., additional, Rostoker, G., additional, Reeves, G. D., additional, Rodger, A. L., additional, and Singer, H. J., additional

Published
2013
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22. Investigation of a substorm following an extended interval of northward interplanetary magnetic field

Author

Lui, A.T. Y., primary, Williams, D.J., additional, McEntire, R.W., additional, Ohtani, S., additional, Zanetti, L.J., additional, Bristow, W.A., additional, Greenwald, R.A., additional, Newell, P.T., additional, Christon, S.P., additional, Mukai, T., additional, Tsuruda, K., additional, Yamamoto, T., additional, Kokubun, S., additional, Matsumoto, H., additional, Kojima, H., additional, Murata, T., additional, Fairfield, D.H., additional, Lepping, R.P., additional, Samson, J.C., additional, Rostoker, G., additional, and Reeves, G.D., additional

Published
1998
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25. GEOTAIL, POLAR, WIND, CANOPUS, and ISTP Associated Geosynchronous Satellite Observations of Plasma Wave Emissions and Related Magnetospheric Phenomena during Substorms

Author

Anderson, R. R., primary, Gurnett, D. A., additional, Frank, L. A., additional, Sigwarth, J. B., additional, Matsumoto, H., additional, Hashimoto, K., additional, Kojima, H., additional, Kasaba, Y., additional, Kaiser, M. L., additional, Rostoker, G., additional, Bougeret, J.-L., additional, Steinberg, J.-L., additional, Nagano, I., additional, Murata, T., additional, Singer, H. J., additional, Onsager, T. G., additional, and Thomsen, M. F., additional

Published
1998
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26. A CME Loop and the January 10, 1997 First Substorm

Author

Tsurutani, B. T., primary, Arballo, J. K., additional, Lakhina, G. S., additional, Ho, C. M., additional, Ajello, J. M., additional, Pickett, J. S., additional, Gurnett, D. A., additional, Lepping, R. P., additional, Peterson, W. K., additional, Rostoker, G., additional, Kamide, Y., additional, and Kokubun, S., additional

Published
1998
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29. Auroral zone dayside precipitation during magnetic storm initial phases

Author

Berdichevsky, D, Lepping, R, Hughes, T, Rostoker, G, Yang, H, Araki, T, Pickett, J, Vasyliunas, V, Lakhina, G, Gonzalez, W, Arballo, J, Zhou, X, and Tsurutani, B

Abstract

Significant charged-particle precipitation occurs in the dayside auroral zone during and after interplanetary shock impingements on the Earth's magnetosphere.

Published
2001

30. Effects of substorms on the stormtime ring current index Dst

Author

Rostoker, G.

Abstract

There has been some discussion in recent times regarding whether or not substorm expansive phase activity plays any role of importance in the formation of the stormtime ring current. I explore this question using the Kp index as a proxy for substorm expansive phase activity and the Dst index as a proxy for symmetric ring current strength. I find that increases in Dst are mildly related to the strength of substorm expansive phase activity during the development of the storm main phase. More surprisingly, I find that the strength of Dst during the storm recovery phase is positively correlated with the strength of substorm expansive phase activity. This result has an important bearing on the question of how much the Dst index reflects activity other than that of the stormtime symmetric ring current strength for which it is supposed to be a proxy.Key words: Ionosphere (electric fields and currents) - Magnetospheric physics (current systems; storms and substorms)

Published
2018

34. The January 10, 1997 Auroral Hot Spot, Horseshoe Aurora and First Substorm: A CME Loop?

Author

Tsurutani, B. T, Arballo, J. K, Lakhina, G. S, Ho, C. M, Ajello, J, Pickett, J. S, Gurnett, D. A, Lepping, R. P, Peterson, W. K, Rostoker, G, Kamide, Y, and Kokubun, S

Subjects
Geophysics
Abstract

The purpose of this paper is to study an interplanetary Bs feature ahead of a magnetic cloud and its related auroral and magnetospheric responses.

Published
1998

35. Current Understanding of Magnetic Storms: Storm/Substorm Relationships

Author

Tsurutani, B. T, Singer, H. J, Sharma, A. S, Rostoker, G, Reeves, E. D. G, Phillips, J. L, McPherron, R. L, Joselyn, J. A, Grande, M, Gonzalez, W. D, Daglis, I. A, Baumjohann, W, Kamide, Y, and Vasyliunas, V. M

Abstract

This paper attempts to summarize the current understanding of the storm/substorm relationship by clearing up a considerabel amount of controversy and addressing the question of how solar wind energy is deposited into the constituent elements that are critical to magnetospheric and ionospheric processes.

Published
1997

37. What is a geomagnetic storm?

Author

Gonzalez, W. D, Joselyn, J. A, Kamide, Y, Kroehl, H. W, Rostoker, G, Tsurutani, B. T, and Vasyliunas, V. M

Subjects
Geophysics
Abstract

After a brief review of magnetospheric and interplanetary phenomena for intervals with enhanced solar wind-magnetosphere interaction, an attempt is made to define a geomagnetic storm as an interval of time when a sufficiently intense and long-lasting interplanetary convection electric field leads, through a substantial energization in the magnetosphere-ionosphere system, to an intensified ring current sufficiently strong to exceed some key threshold of the quantifying storm time Dst index. The associated storm/substorm relationship problem is also reviewed. Although the physics of this relationship does not seem to be fully understood at this time, basic and fairly well established mechanisms of this relationship are presented and discussed. Finally, toward the advancement of geomagnetic storm research, some recommendations are given concerning future improvements in monitoring existing geomagnetic indices as well as the solar wind near Earth.

Published
1994
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38. A new era in magnetospheric research

Author

Akasofu, S.-I, Stenbaek-Nielsen, H. C, Hallinan, T. J, Rostoker, G, and Baker, D. N

Subjects
Geophysics
Abstract

Accounts are given of the development status and prospective efficacy of the Geoscience Environmental Data Display, the Space Environment Laboratory Data Acquisition and Display System, and the Geospace Environment Modeling program, which are all concerned with the 3D definition of the earth's magnetosphere. Attention is given to current and prospective improvements in the integration of all these data-gathering systems.

Published
1992

39. Regions of negative Bz in the Tsyganenko 1989 model neutral sheet

Author

Donovan, E. F, Rostoker, G, and Huang, C. Y

Subjects
Geophysics
Abstract

A disturbing feature of the Tsyganenko (1989) model magnetic field, namely the occurrence of negative Bz in the model neutral sheet is pointed out. On the basis of observations of Bz in the neutral sheet it is concluded that this is an artifact of the model and not a real effect. This feature of the model should be considered when the model is used either to infer mappings from the ionosphere to the vicinity of the neutral sheet or as a tool in theoretical studies. It is proposed that in the development of future models, it would be useful for the distribution of Bz in the neutral sheet to be imposed as a constraint on the model.

Published
1992

40. Nonadiabatic heating of the central plasma sheet at substorm onset

Author

Huang, C. Y, Frank, L. A, Rostoker, G, Fennell, J, and Mitchell, D. G

Subjects
Geophysics
Abstract

Heating events in the plasma sheet boundary layer and central plasma sheet are found to occur at the onset of expansive phase activity. The main effect is a dramatic increase in plasma temperature, coincident with a partial dipolarization of the magnetic field. Fluxes of energetic particles increase without dispersion during these events which occur at all radial distances up to 23 RE, the apogee of the ISEE spacecraft. A major difference between these heating events and those observed at geosynchronous distances lies in the heating mechanism which is nonadiabatic beyond 10 RE but may be adiabatic closer to earth. The energy required to account for the increase in plasma thermal energy is comparable with that required for Joule heating of the ionosphere. The plasma sheet must be considered as a major sink in the energy balance of a substorm. Lobe magnetic pressures during these events are estimated. Change in lobe pressure are generally not correlated with onsets or intensifications of expansive phase activity.

Published
1992

42. Plasma waves observed during cusp energetic particle events and their correlation with Polar and akebono satellite and ground data

Author

Pickett, J.S., Gurnett, D.A., Menietti, J.D., LeDocq, M.J., Scudder, J.D., Frank, L.A., Sigwarth, J.B., Ackerson, K.L., Morgan, D.D., Franz, J.R., Kintner, P.M., Tsurutani, B.T., Ho, C.M., Chen, J., Fritz, T.A., Russell, C.T., Peterson, W.K., Kasahara, Y., Kimura, I., Watanabe, S., Arkos, G.G., Rostoker, G., Kokubun, S., Fukunishi, H., Pfaff, R.F., Mozer, F.S., Hsieh, S.-Y., Mukai, T., and Chandler, M.O.

Published
1999
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45. Field line resonances as a trigger and a tracer for substorm onset

Author

Rae, I. Jonathan, Murphy, K.R., Watt, CE.J., Rostoker, G., Rankin, R., Mann, I. R., Hodgson, C. R., Frey, H. U., Degeling, A. W., and Forsyth, C.

Abstract

In this paper, we show that periodic auroral arc structures are seen at the location of one particular auroral substorm onset for the 15 min preceding onset, suggesting that field line resonances should be considered a strong candidate for triggering substorm onset. Irrespective of whether this field line resonance is coincidentally or causally linked to this substorm onset, the characteristics of the field line resonance can be used to remote sense the characteristics of the geomagnetic field line that supports substorm onset. In this instance, the eigenfrequency of this resonance is around 12 mHz. Interestingly, however, there is no evidence of this field line resonance in a seven satellite major Time History of Events and Macroscale Interactions during Substorms (THEMIS)-GOES conjunction, ranging from geosynchronous orbit to ~30 RE. However, using space-based cross-phase measurements of the local field line eigenfrequency at the inner THEMIS locations, we find that the local field line eigenfrequency is 6–10 mHz. Hence, we can reliably say that this 12 mHz Field Line Resonance (FLR) must lie inside of THEMIS locations. Our conclusion is that a high-m field line resonance can both represent a strong candidate for a trigger for substorm onset, as first proposed by Samson et al. (1992), and that its characteristics can provide invaluable information as to where substorm onset occurs in the magnetosphere.

Published
2014

46. Surface waves on the dawn magnetopause: Connection with ground PC 5 pulsations

Author

Rostoker, G., Kokubun, S., Kawano, H., Mukai, Toshifumi, Saito, Yoshifumi, Tsuruda, Koichiro, and Yamamoto, Tatsundo

Subjects
Physics, Atmospheric Science, Aerospace Engineering, Magnetosphere, Astronomy and Astrophysics, Astrophysics, Atmospheric sciences, Instability, Magnetic field, Geophysics, Magnetosheath, Amplitude, Space and Planetary Science, Surface wave, Physics::Space Physics, General Earth and Planetary Sciences, Magnetopause, Astrophysics::Earth and Planetary Astrophysics, Excitation
Abstract

Observations of the Geotail spacecraft show that ion flow oscillations in the Pc 5 frequency range are fairly common at the equatorial region in the dawn magnetosphere (−5 ≤ X GSM ≤ 5). The amplitudes of these oscillations sometimes exceed 250 km/s. We examined in detail several events associated with temporal magnetopause crossings during the course of oscillations. It is found that plasma flow oscillations near the magnetopause correspond closely with magnetic field pulsations at latitudes of 70 – 75 degrees on the ground, although the form of the flow oscillation is spiky rather than sinusoidal. The boundary normal inclines sunward (tailward), when the spacecraft enters the magnetosheath (magnetosphere). Most of magnetopause crossings analyzed are cases with high magnetic shears (Bz in the magnetopause was negative in most cases). Outward and sunward flows, whose magnitudes are greater than those in the magnetosheath, were observed in the magnetosphere after inbound crossings, while inward and tailward flows were detected before outbound crossings. These characteristics are not necessarily consistent with the excitation of surface waves by the Kelvin-Helmholtz instability. A high-speed flow with the sunward and outward component was also observed in the magnetosphere after the inbound crossing with high magnetic shear in an isolated and temporal magnetopause crossing event drivent by a pressure pulse.

Published
2000

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