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Your search keyword '"Drake, J. F."' showing total 44 results
Start Over Author "Drake, J. F." Journal geophysical research letters
44 results on '"Drake, J. F."'

1. Parker Solar Probe Observations of Solar Wind Energetic Proton Beams Produced by Magnetic Reconnection in the Near‐Sun Heliospheric Current Sheet

Author

Phan, T. D., primary, Verniero, J. L., additional, Larson, D., additional, Lavraud, B., additional, Drake, J. F., additional, Øieroset, M., additional, Eastwood, J. P., additional, Bale, S. D., additional, Livi, R., additional, Halekas, J. S., additional, Whittlesey, P. L., additional, Rahmati, A., additional, Stansby, D., additional, Pulupa, M., additional, MacDowall, R. J., additional, Szabo, P. A., additional, Koval, A., additional, Desai, M., additional, Fuselier, S. A., additional, Velli, M., additional, Hesse, M., additional, Pyakurel, P. S., additional, Maheshwari, K., additional, Kasper, J. C., additional, Stevens, J. M., additional, Case, A. W., additional, and Raouafi, N. E., additional

Published
2022
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2. MMS Observations of Large Guide Field Symmetric Reconnection Between Colliding Reconnection Jets at the Center of a Magnetic Flux Rope at the Magnetopause

Author

Oieroset, M, Phan, T. D, Haggerty, C, Shay, M. A, Eastwood, J. P, Gershman, D. J, Drake, J. F, Fujimoto, M, Ergun, R. E, Mozer, F. S, Dorelli, J. C, Giles, B. L, Moore, T. E, and Paterson, W

Subjects
Geophysics
Abstract

We report evidence for reconnection between colliding reconnection jets in a compressed current sheet at the center of a magnetic flux rope at Earth's magnetopause. The reconnection involved nearly symmetric Inflow boundary conditions with a strong guide field of two. The thin (2.5 ion-skin depth (d(sub i) width) current sheet (at approximately 12 d(sub i) downstream of the X line) was well resolved by MMS, which revealed large asymmetries in plasma and field structures in the exhaust. Ion perpendicular heating, electron parallel heating, and density compression occurred on one side of the exhaust, while ion parallel heating and density depression were shifted to the other side. The normal electric field and double out-of-plane (bifurcated) currents spanned almost the entire exhaust. These observations are in good agreement with a kinetic simulation for similar boundary conditions, demonstrating in new detail that the structure of large guide field symmetric reconnection is distinctly different from antiparallel reconnection.

Published
2016
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3. Reconnection With Magnetic Flux Pileup at the Interface of Converging Jets at the Magnetopause

Author

Oieroset, M., Phan, T. D., Drake, J. F., Eastwood, J. P., Fuselier, S. A., Strangeway, R. J., Haggerty, C., Shay, M. A., Wang, S., Chen, L.‐J., Kacem, I., Lavraud, B., Angelopoulos, V., Burch, J. L., Torbert, R. B., Ergun, R. E., Khotyaintsev, Y., Lindqvist, P. A., Gershman, D. J., Giles, B. L., Pollock, C., Moore, T. E., Russell, C. T., Avanov, L. A., Paterson, W., Oka, Mitsuo, Saito, Yoshifumi, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Science and Technology Facilities Council (STFC)

Subjects
010504 meteorology & atmospheric sciences, Field (physics), Astrophysics::High Energy Astrophysical Phenomena, Flux, SHEAR EVIDENCE, 010502 geochemistry & geophysics, 01 natural sciences, PLASMA BETA, Current sheet, DEPENDENCE, Physics::Plasma Physics, MD Multidisciplinary, TOPOLOGY, Meteorology & Atmospheric Sciences, Astrophysics::Solar and Stellar Astrophysics, Geosciences, Multidisciplinary, FIELD, 0105 earth and related environmental sciences, Science & Technology, Geology, Magnetic flux, Computational physics, MMS OBSERVATIONS, Geophysics, [SDU]Sciences of the Universe [physics], Physical Sciences, Physics::Space Physics, General Earth and Planetary Sciences, Magnetopause
Abstract

著者人数: 27名, Accepted: 2019-01-15, 資料番号: SA1180269000

Published
2019
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4. Electron Inflow Velocities and Reconnection Rates at Earth's Magnetopause and Magnetosheath

Author

Burch, J. L., primary, Webster, J. M., additional, Hesse, M., additional, Genestreti, K. J., additional, Denton, R. E., additional, Phan, T. D., additional, Hasegawa, H., additional, Cassak, P. A., additional, Torbert, R. B., additional, Giles, B. L., additional, Gershman, D. J., additional, Ergun, R. E., additional, Russell, C. T., additional, Strangeway, R. J., additional, Le Contel, O., additional, Pritchard, K. R., additional, Marshall, A. T., additional, Hwang, K.‐J., additional, Dokgo, K., additional, Fuselier, S. A., additional, Chen, L.‐J., additional, Wang, S., additional, Swisdak, M., additional, Drake, J. F., additional, Argall, M. R., additional, Trattner, K. J., additional, Yamada, M., additional, and Paschmann, G., additional

Published
2020
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5. Kinetic signatures of the region surrounding the X line in asymmetric (magnetopause) reconnection

Author

Shay, M. A., Phan, T. D., Haggerty, C. C., Drake, J. F., Malakit, K., Cassak, P. A., Swisdak, M., and Fujimoto, Masaki

Subjects
Physics, 010504 meteorology & atmospheric sciences, Field (physics), Magnetosphere, FOS: Physical sciences, Magnetic reconnection, 01 natural sciences, Space Physics (physics.space-ph), Geomagnetic reversal, Magnetic field, Computational physics, Geophysics, Magnetosheath, Physics - Space Physics, Electric field, 0103 physical sciences, Physics::Space Physics, General Earth and Planetary Sciences, Magnetopause, 010306 general physics, 0105 earth and related environmental sciences
Abstract

Kinetic particle-in-cell simulations are used to identify signatures of the electron diffusion region (EDR) and its surroundings during asymmetric magnetic reconnection. A "shoulder" in the sunward pointing normal electric field (EN > 0) at the reconnection magnetic field reversal is a good indicator of the EDR, and is caused by magnetosheath electron meandering orbits in the vicinity of the x-line. Earthward of the X-line, electrons accelerated by EN form strong currents and crescent-shaped distribution functions in the plane perpendicular to B. Just downstream of the X-line, parallel electric fields create field-aligned crescent electron distribution functions. In the immediate upstream magnetosheath, magnetic field strength, plasma density, and perpendicular electron temperatures are lower than the asymptotic state. In the magnetosphere inflow region, magnetosheath ions intrude resulting in an Earthward pointing electric field and parallel heating of magnetospheric particles. Many of the above properties persist with a guide field of at least unity., Submitted to Geophysical Research Letters

Published
2016

6. Transition to whistler mediated magnetic reconnection

Author

Mandt, M. E, Denton, R. E, and Drake, J. F

Subjects
Geophysics
Abstract

The transition in the magnetic reconnection rate from the resistive magnetohydrodynamic (MHD) regime where the Alfen wave controls reconnection to a regime in which the ions become unmagnetized and the whistler wave mediates reconnection is explored with 2-D hybrid simulations. In the whistler regime the electrons carry the currents while the ions provide a neutralizing background. A simple physical picture is presented illustrating the role of the whistler mediated reconnection is calculated analytically. The development of an out-of-plane component of the magnetic field is an observable signature of whistler driven reconnection.

Published
1994
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8. Magnetic blowout during collisionless reconnection

Author

Drake, J. F and Burkhart, G. R

Subjects
Geophysics
Abstract

Analytic calculations and simulations of the steady-state structure of the dissipation region during collisionless reconnection are described. Ions are treated as particles and electrons as a dissipative fluid. A limiting reconnection rate results as the ions 'blowout' the magnetic field in the dissipation area. The implications for comprehending substorm dynamics are discussed.

Published
1992

9. Three-dimensional simulation study of ionospheric plasma clouds

Author

Zalesak, S. T, Drake, J. F, and Huba, J. D

Subjects
Geophysics
Abstract

The results of fully three-dimensional numerical simulations of ionospheric plasma cloud evolution are presented. The evolution of the plasma cloud considered by Drake and Huba (1987) in the limit of vanishingly small ion compressibility is discussed. Simulations support the results of the analytical theory: finite plasma temperature, combined with fully three-dimensional plasma dynamics, is a stabilizing influence on plasma cloud evolution. This stability is associated with sheared azimuthal ion flows in the vicinity of the cloud surface. Cloud evolution using realistic values of ion compressibility show that the cloud rapidly diffuses to a state in which the sheared azimuthal flow is substantially reduced; subsequently, the cloud becomes unstable and structures.

Published
1990

11. Guide Field Reconnection: Exhaust Structure and Heating

Author

Eastwood, J. P., primary, Mistry, R., additional, Phan, T. D., additional, Schwartz, S. J., additional, Ergun, R. E., additional, Drake, J. F., additional, Øieroset, M., additional, Stawarz, J. E., additional, Goldman, M. V., additional, Haggerty, C., additional, Shay, M. A., additional, Burch, J. L., additional, Gershman, D. J., additional, Giles, B. L., additional, Lindqvist, P. A., additional, Torbert, R. B., additional, Strangeway, R. J., additional, and Russell, C. T., additional

Published
2018
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13. Electron Bulk Heating in Magnetic Reconnection at Earth's Magnetopause: Dependence on the Inflow Alfven Speed and Magnetic Shear

Author

Phan, T. D., Shay, M. A., Gosling, J. T., Drake, J. F., Paschmann, G., Oieroset, M., Eastwood, J. P., Angelopoulos, V., and Fujimoto, Masaki

Subjects
Physics, Magnetic energy, Magnetic reconnection, Geophysics, Electron, Inflow, Computational physics, Magnetic field, Solar wind, Magnetosheath, Physics::Space Physics, General Earth and Planetary Sciences, Magnetopause
Abstract

Accepted: 2013-08-28, 資料番号: SA1004594000

Published
2013

15. Localized Oscillatory Energy Conversion in Magnetopause Reconnection

Author

Burch, J. L., primary, Ergun, R. E., additional, Cassak, P. A., additional, Webster, J. M., additional, Torbert, R. B., additional, Giles, B. L., additional, Dorelli, J. C., additional, Rager, A. C., additional, Hwang, K.‐J., additional, Phan, T. D., additional, Genestreti, K. J., additional, Allen, R. C., additional, Chen, L.‐J., additional, Wang, S., additional, Gershman, D., additional, Le Contel, O., additional, Russell, C. T., additional, Strangeway, R. J., additional, Wilder, F. D., additional, Graham, D. B., additional, Hesse, M., additional, Drake, J. F., additional, Swisdak, M., additional, Price, L. M., additional, Shay, M. A., additional, Lindqvist, P.‐A., additional, Pollock, C. J., additional, Denton, R. E., additional, and Newman, D. L., additional

Published
2018
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16. Drift waves, intense parallel electric fields, and turbulence associated with asymmetric magnetic reconnection at the magnetopause

Author

Ergun, R. E., primary, Chen, L.-J., additional, Wilder, F. D., additional, Ahmadi, N., additional, Eriksson, S., additional, Usanova, M. E., additional, Goodrich, K. A., additional, Holmes, J. C., additional, Sturner, A. P., additional, Malaspina, D. M., additional, Newman, D. L., additional, Torbert, R. B., additional, Argall, M. R., additional, Lindqvist, P.-A., additional, Burch, J. L., additional, Webster, J. M., additional, Drake, J. F., additional, Price, L., additional, Cassak, P. A., additional, Swisdak, M., additional, Shay, M. A., additional, Graham, D. B., additional, Strangeway, R. J., additional, Russell, C. T., additional, Giles, B. L., additional, Dorelli, J. C., additional, Gershman, D., additional, Avanov, L., additional, Hesse, M., additional, Lavraud, B., additional, Le Contel, O., additional, Retino, A., additional, Phan, T. D., additional, Goldman, M. V., additional, Stawarz, J. E., additional, Schwartz, S. J., additional, Eastwood, J. P., additional, Hwang, K.-J., additional, Nakamura, R., additional, and Wang, S., additional

Published
2017
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17. MMS observations of electron‐scale filamentary currents in the reconnection exhaust and near the X line

Author

Phan, T. D., primary, Eastwood, J. P., additional, Cassak, P. A., additional, Øieroset, M., additional, Gosling, J. T., additional, Gershman, D. J., additional, Mozer, F. S., additional, Shay, M. A., additional, Fujimoto, M., additional, Daughton, W., additional, Drake, J. F., additional, Burch, J. L., additional, Torbert, R. B., additional, Ergun, R. E., additional, Chen, L. J., additional, Wang, S., additional, Pollock, C., additional, Dorelli, J. C., additional, Lavraud, B., additional, Giles, B. L., additional, Moore, T. E., additional, Saito, Y., additional, Avanov, L. A., additional, Paterson, W., additional, Strangeway, R. J., additional, Russell, C. T., additional, Khotyaintsev, Y., additional, Lindqvist, P. A., additional, Oka, M., additional, and Wilder, F. D., additional

Published
2016
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28. UV stellar occultation measurements of nighttime equatorial ozone

Author

Riegler, G. R, Liu, S. C, Wasser, B, Atreya, S. K, Donahue, T. M, and Drake, J. F

Subjects
Geophysics
Abstract

The ultraviolet spectrometer-telescope on Copernicus was used for stellar occultation measurements of atmospheric ozone. Two sets of observations of the target star Beta-Cen were carried out on 26 July 1975 and 13-14 June 1976 at wavelengths from 2550 A to 3100 A. After unfolding of the data, ozone density profiles near the equator within 3 hours of local midnight were obtained at altitudes from 47 to 114 km. A secondary maximum at 97 km has been observed in both sets of data. The ozone density between 47 and 75 km is a factor of 2 to 3 times as large as current models predict. At the lower boundary, about half the ozone destruction should be caused by NOx and ClOx. Above 55 km, virtually all loss is due to HOx. These results suggest an overestimate of HOx and ClOx loss processes or a serious underestimate of the Ox production rate.

Published
1977

29. Ultraviolet stellar occultation measurement of the H2 and O2 densities near 100 km in the earth's atmosphere

Author

Atreya, S. K, Wasser, B, Donahue, T. M, Sharp, W. E, Drake, J. F, and Riegler, G. R

Subjects
Geophysics
Abstract

Results are presented for an experimental study designed to measure the density of H2 near 100 km in the earth's atmosphere from occultation of a star, Gamma Vel, by the earth's atmosphere at several wavelengths near the H2 absorption line at 1108.128 A by a spectrometer on an orbiting astronomical observatory. Measurement of the O2 density between 95 and 123 km is also reported. Attention is focused on testing the predictions of a model of the distribution of hydrogen constituents, H, H2, H2O, CH4, OH, and H2O in the upper atmosphere related to a theory of hydrogen escape developed by Hunten and Strobel (1974) and by Liu and Donahue (1974). The measured H2 densities are found to be in good agreement with recent theoretical predictions, whereas the measured O2 density profile generally agrees with the models except for a wavelike structure in the range 104-114 km.

Published
1976

36. Kinetic signatures of the region surrounding the Xline in asymmetric (magnetopause) reconnection

Author

Shay, M. A., Phan, T. D., Haggerty, C. C., Fujimoto, M., Drake, J. F., Malakit, K., Cassak, P. A., and Swisdak, M.

Abstract

Kinetic particle‐in‐cell simulations are used to identify signatures of the electron diffusion region (EDR) and its surroundings during asymmetric magnetic reconnection. A “shoulder” in the sunward pointing normal electric field (EN> 0) at the reconnection magnetic field reversal is a good indicator of the EDR and is caused by magnetosheath electron meandering orbits in the vicinity of the Xline. Earthward of the Xline, electrons accelerated by ENform strong currents and crescent‐shaped distribution functions in the plane perpendicular to B. Just downstream of the Xline, parallel electric fields create field‐aligned crescent electron distribution functions. In the immediate upstream magnetosheath, magnetic field strength, plasma density, and perpendicular electron temperatures are lower than the asymptotic state. In the magnetosphere inflow region, magnetosheath ions intrude resulting in an Earthward pointing electric field and parallel heating of magnetospheric particles. Many of the above properties persist with a guide field of at least unity. Where the sunward normal electric field overlaps the magnetic field reversal (the “shoulder”) is a signature of electron diffusion regionSignatures in the regions upstream of the Xline establish context to find the diffusion regionCusp‐like motion of magnetosheath electrons associated with electron acceleration produce crescent‐shaped particle distributions

Published
2016
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42. Bifurcated cusp ion signatures: Evidence for re-reconnection?

Author

Fuselier, S. A., primary, Shelley, E. G., additional, Peterson, W. K., additional, Lennartsson, O. W., additional, Collin, H. L., additional, Drake, J. F., additional, Ghielmetti, A. G., additional, Balsiger, H., additional, Burch, J. L., additional, Johnstone, A., additional, Rosenbauer, H., additional, and Steinberg, J. T., additional

Published
1997
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