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Your search keyword '"Denig, W.F"' showing total 11 results
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11 results on '"Denig, W.F"'

1. Ground-based and satellite observations of high-latitude auroral activity in the dusk sector of the auroral oval.

Author

Kauristie, K, Pulkkinen, T.I, Amm, O, Viljanen, A, Syrjäsuo, M, Janhunen, P, Massetti, S, Orsini, S, Candidi, M, Watermann, J, Donovan, E, Prikryl, P, Mann, I, Eglitis, P, Smith, C, Denig, W.F, Opgenoorth, H, Lockwood, M, Kauristie, K, Pulkkinen, T.I, Amm, O, Viljanen, A, Syrjäsuo, M, Janhunen, P, Massetti, S, Orsini, S, Candidi, M, Watermann, J, Donovan, E, Prikryl, P, Mann, I, Eglitis, P, Smith, C, Denig, W.F, Opgenoorth, H, and Lockwood, M

Abstract

On Dec 07 2000, during 1330-1530 UT the MIR-ACLE allsky camera at Ny ° Alesund observed auroras at high latitudes (MLAT ¢76 ) simultaneously when the Clus-ter spacecraft were skimming the magnetopause in the same MLT se

Published
2001

2. Cluster boundary-layer measurements and optical observations at magnetically conjugate sites.

Author

Moen, J., Holtet, J.A., Pedersen, A., Lybekk, B., Svenes, K., Oksavik, K., Denig, W.F., Lucek, E., Søraas, F. and André, M. and Moen, J., Holtet, J.A., Pedersen, A., Lybekk, B., Svenes, K., Oksavik, K., Denig, W.F., Lucek, E., Søraas, F. and André, M.

Abstract

The Cluster spacecraft experienced several boundary layer encounters when flying outbound from the magnetosphere to the magnetosheath in the dusk sector on 14 January 2001. The dayside boundary layer was populated by magnetosheath electrons, but not with

Published
2001

3. High-latitude ionospheric electrodynamics as determined by the assimilative mapping of ionospheric electrodynamics procedure for the conjunctive SUNDIAL/ATLAS 1/GEM period of March 28-29, 1992

Author

Lu, G., Emery, B.A., Rodger, A.S., Lester, M., Taylor, J.R., Evans, D.S., Ruohoniemi, J.M., Denig, W.F., de la Beaujardiere, O., Frahm, R.A., Winningham, J.D., Chenette, D.L., Lu, G., Emery, B.A., Rodger, A.S., Lester, M., Taylor, J.R., Evans, D.S., Ruohoniemi, J.M., Denig, W.F., de la Beaujardiere, O., Frahm, R.A., Winningham, J.D., and Chenette, D.L.

Published
1996

4. Assimilative mapping of ionospheric electrodynamics in the thermosphere-ionosphere general circulation model comparisons with global ionospheric and thermospheric observations during the GEM/SUNDIAL period of March 28-29, 1992

Author

Emery, B.A., Lu, G., Szuszczewicz, E.P., Richmond, A.D., Roble, R.G., Richards, P.G., Miller, K.L., Niciejewski, R., Evans, D.S., Rich, F.J., Denig, W.F., Chenette, D.L., Wilkinson, P., Pulinets, S., O'Loughlin, K.F., Hanbaba, R., Abdu, M., Jiao, P., Igarashi, K., Reddy, B.M., Emery, B.A., Lu, G., Szuszczewicz, E.P., Richmond, A.D., Roble, R.G., Richards, P.G., Miller, K.L., Niciejewski, R., Evans, D.S., Rich, F.J., Denig, W.F., Chenette, D.L., Wilkinson, P., Pulinets, S., O'Loughlin, K.F., Hanbaba, R., Abdu, M., Jiao, P., Igarashi, K., and Reddy, B.M.

Published
1996

5. High-latitude ionospheric electrodynamics as determined by the assimilative mapping of ionospheric electrodynamics procedure for the conjunctive SUNDIAL/ATLAS 1/GEM period of March 28-29, 1992

Author

Lu, G., Emery, B.A., Rodger, A.S., Lester, M., Taylor, J.R., Evans, D.S., Ruohoniemi, J.M., Denig, W.F., de la Beaujardiere, O., Frahm, R.A., Winningham, J.D., Chenette, D.L., Lu, G., Emery, B.A., Rodger, A.S., Lester, M., Taylor, J.R., Evans, D.S., Ruohoniemi, J.M., Denig, W.F., de la Beaujardiere, O., Frahm, R.A., Winningham, J.D., and Chenette, D.L.

Published
1996

6. Assimilative mapping of ionospheric electrodynamics in the thermosphere-ionosphere general circulation model comparisons with global ionospheric and thermospheric observations during the GEM/SUNDIAL period of March 28-29, 1992

Author

Emery, B.A., Lu, G., Szuszczewicz, E.P., Richmond, A.D., Roble, R.G., Richards, P.G., Miller, K.L., Niciejewski, R., Evans, D.S., Rich, F.J., Denig, W.F., Chenette, D.L., Wilkinson, P., Pulinets, S., O'Loughlin, K.F., Hanbaba, R., Abdu, M., Jiao, P., Igarashi, K., Reddy, B.M., Emery, B.A., Lu, G., Szuszczewicz, E.P., Richmond, A.D., Roble, R.G., Richards, P.G., Miller, K.L., Niciejewski, R., Evans, D.S., Rich, F.J., Denig, W.F., Chenette, D.L., Wilkinson, P., Pulinets, S., O'Loughlin, K.F., Hanbaba, R., Abdu, M., Jiao, P., Igarashi, K., and Reddy, B.M.

Published
1996

7. Characteristics of ionospheric convection and field-aligned current in the dayside cusp region

Author

Lu, G., Lyons, L.R., Reiff, P.H., Denig, W.F., de la Beaujardiere, O., Kroehl, H.W., Newell, P.T., Rich, F.J., Opgenoorth, H., Persson, M.A.L., Ruohoniemi, J.M., Friis-Christensen, E., Tomlinson, L., Morris, R., Burns, G., McEwin, A., Lu, G., Lyons, L.R., Reiff, P.H., Denig, W.F., de la Beaujardiere, O., Kroehl, H.W., Newell, P.T., Rich, F.J., Opgenoorth, H., Persson, M.A.L., Ruohoniemi, J.M., Friis-Christensen, E., Tomlinson, L., Morris, R., Burns, G., and McEwin, A.

Published
1995

8. Characteristics of ionospheric convection and field-aligned current in the dayside cusp region

Author

Lu, G., Lyons, L.R., Reiff, P.H., Denig, W.F., de la Beaujardiere, O., Kroehl, H.W., Newell, P.T., Rich, F.J., Opgenoorth, H., Persson, M.A.L., Ruohoniemi, J.M., Friis-Christensen, E., Tomlinson, L., Morris, R., Burns, G., McEwin, A., Lu, G., Lyons, L.R., Reiff, P.H., Denig, W.F., de la Beaujardiere, O., Kroehl, H.W., Newell, P.T., Rich, F.J., Opgenoorth, H., Persson, M.A.L., Ruohoniemi, J.M., Friis-Christensen, E., Tomlinson, L., Morris, R., Burns, G., and McEwin, A.

Published
1995

9. Ionospheric Convection Response to Slow, Strong Variations in a Northward Interplanetary Magnetic Field: A Case Study for January 14, 1988

Author

Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.J., Hairston, M.R., Cumnock, Judy, Denig, W.F., Rich, F.J., de la Beaujardière, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.H., Evans, D.S., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., MacLennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., Tomlinson, L., Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.J., Hairston, M.R., Cumnock, Judy, Denig, W.F., Rich, F.J., de la Beaujardière, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.H., Evans, D.S., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., MacLennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., and Tomlinson, L.

Abstract

We analyze ionospheric convection patterns over the polar regions during the passage of an interplanetary magnetic cloud on January 14, 1988, when the interplanetary magnetic field (IMF) rotated slowly in direction and had a large amplitude. Using the assimilative mapping of ionospheric electrodynamics (AMIE) procedure, we combine simultaneous observations of ionospheric drifts and magnetic perturbations from many different instruments into consistent patterns of high-latitude electrodynamics, focusing on the period of northward IMF. By combining satellite data with ground-based observations, we have generated one of the most comprehensive data sets yet assembled and used it to produce convection maps for both hemispheres. We present evidence that a lobe convection cell was embedded within normal merging convection during a period when the IMF B(y) and B(z) components were large and positive. As the IMF became predominantly northward, a strong reversed convection pattern (afternoon-to-morning potential drop of around 100 kV) appeared in the southern (summer) polar cap, while convection in the northern (winter) hemisphere became weak and disordered with a dawn-to-dusk potential drop of the order of 30 kV. These patterns persisted for about 3 hours, until the IMF rotated significantly toward the west. We interpret this behavior in terms of a recently proposed merging model for northward IMF under solstice conditions, for which lobe field lines from the hemisphere tilted toward the Sun (summer hemisphere) drape over the dayside magnetosphere, producing reverse convection in the summer hemisphere and impeding direct contact between the solar wind and field lines connected to the winter polar cap. The positive IMF B(x) component present at this time could have contributed to the observed hemispheric asymmetry. Reverse convection in the summer hemisphere broke down rapidly after the ratio \textbackslashB(y)/B(z)\textbackslash exceeded unity, while convection in the winter, NR 20140805

Published
1993
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10. Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988

Author

Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.U., Hairston, M.R., Cumnock, J.A., Denig, W.F., Rich, F.J., de la Beaujardiere, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.-H., Evans, D., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., Maclennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., Tomlinson, L., Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.U., Hairston, M.R., Cumnock, J.A., Denig, W.F., Rich, F.J., de la Beaujardiere, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.-H., Evans, D., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., Maclennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., and Tomlinson, L.

Published
1993

11. Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988

Author

Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.U., Hairston, M.R., Cumnock, J.A., Denig, W.F., Rich, F.J., de la Beaujardiere, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.-H., Evans, D., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., Maclennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., Tomlinson, L., Knipp, D.J., Emery, B.A., Richmond, A.D., Crooker, N.U., Hairston, M.R., Cumnock, J.A., Denig, W.F., Rich, F.J., de la Beaujardiere, O., Ruohoniemi, J.M., Rodger, A.S., Crowley, G., Ahn, B.-H., Evans, D., Fuller-Rowell, T.J., Friis-Christensen, E., Lockwood, M., Kroehl, H.W., Maclennan, C.G., McEwin, A., Pellinen, R.J., Morris, R.J., Burns, G.B., Papitashvili, V., Zaitzev, A., Troshichev, O., Sato, N., Sutcliffe, P., and Tomlinson, L.

Published
1993

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