Results 11 to 20 of about 4,523 (241)

Dual HF radar study of the subauroral polarization stream [PDF]

Annales Geophysicae, 2007
The dual HF radars comprising the Tasman International Geophysical Environment Radar (TIGER) system often observe localized high-velocity F-region plasma flows (≥1500 m/s) in the midnight sector (20:00–02:00 MLT) at magnetic latitudes as low as ...
R. A. Makarevich, P. L. Dyson
doaj   +1 more source

Substorm‐Ring Current Coupling: A Comparison of Isolated and Compound Substorms [PDF]

Journal of Geophysical Research: Space Physics, 2019
AbstractSubstorms are a highly variable process, which can occur as an isolated event or as part of a sequence of multiple substorms (compound substorms). In this study we identify how the low‐energy population of the ring current and subsequent energization varies for isolated substorms compared to the first substorm of a compound event.
J. K. Sandhu, I. J. Rae, M. P. Freeman, M. Gkioulidou, C. Forsyth, G. D. Reeves, K. R. Murphy, M.‐T. Walach   +7 more
openaire   +4 more sources

The high latitude convection response to an interval of substorm activity [PDF]

Annales Geophysicae, 1996
On 17 March 1991, five clear substorm onsets/intensifications took place within a three hour interval. During this interval ground-based data from the EISCAT incoherent scatter radar, a digital CCD all sky camera, and an extensive array of ...
T. K. Yeoman, M. Pinnock
doaj   +1 more source

Association of cusp energetic ions with geomagnetic storms and substorms [PDF]

Annales Geophysicae, 2012
Energetic ions observed in the cusp have been explained as a result of processes within the magnetosphere, but also proposed as a driver of some of those same processes. This study assesses potential connections between energetic ions observed in the
J. T. Niehof, J. T. Niehof, S. K. Morley, R. H. W. Friedel   +3 more
doaj   +1 more source

Prelude to THEMIS tail conjunction study [PDF]

Annales Geophysicae, 2007
A close conjunction of several satellites (LANL, GOES, Polar, Geotail, and Cluster) distributed from the geostationary altitude to about 16 RE downstream in the tail occurred during substorm activity as indicated by global auroral imaging and ground ...
A. T. Y. Lui, Y. Zheng, Y. Zhang, V. Angelopoulos, G. K. Parks, F. S. Mozer, H. Rème, L. M. Kistler, M. W. Dunlop, G. Gustafsson, M. G. Henderson   +10 more
doaj   +1 more source

Correlation between ground-based observations of substorm signatures and magnetotail dynamics [PDF]

Annales Geophysicae, 2005
We present a substorm event study using the four Cluster spacecraft in combination with ground-based instruments, in order to perform simultaneous observations in the ionosphere and magnetotail.
E. Borälv, H. J. Opgenoorth, H. J. Opgenoorth, K. Kauristie, M. Lester, J.-M. Bosqued, J. P. Dewhurst, C. J. Owen, M. Dunlop, M. Dunlop, J. A. Slavin, A. Fazakerley, C. Perry   +12 more
doaj   +1 more source

Energization of the Ring Current by Substorms. [PDF]

J Geophys Res Space Phys, 2018
AbstractThe substorm process releases large amounts of energy into the magnetospheric system, although where the energy is transferred to and how it is partitioned remains an open question. In this study, we address whether the substorm process contributes a significant amount of energy to the ring current. The ring current is a highly variable region,
Sandhu JK, Rae IJ, Freeman MP, Forsyth C, Gkioulidou M, Reeves GD, Spence HE, Jackman CM, Lam MM.   +8 more
europepmc   +9 more sources

Transition from substorm growth to substorm expansion phase as observed with a radial configuration of ISTP and Cluster spacecraft [PDF]

, 2005
International audienceTransition from the growth phase to the substorm expansion during a well-isolated substorm with a strong growth phase is investigated using a unique radial (THEMIS-like) spacecraft constellation near midnight, including the probing ...
Sergeev, V.A., T. Nagai, Kubyshkina, M. V., Slavin, J., Nagai, T., Klecker, B., Mende, S., Thomsen, M., Pulkkinen, T., Slavin, J.A., Sergeev, V. A., Sauvaud, J.-A., V. Angelopoulos, Kubyshkina, M., Thomsen, M.F., S. B. Mende, V. A. Sergeev, Kubyshkina, M.V., Amm, O., Sauvaud, J., J.-A. Sauvaud, Nakamura, R., Mende, S.B., O. Amm, T. Pulkkinen, Baumjohann, W., Thomsen, M. F., Sergeev, V., Angelopoulos, V., Slavin, J. A., M. V. Kubyshkina, J. A. Slavin, M. F. Thomsen, Mende, S. B., B. Klecker, W. Baumjohann, R. Nakamura   +36 more
core   +1 more source

A substorm in midnight auroral precipitation [PDF]

Annales Geophysicae, 2003
DMSP F7 spacecraft observations for the whole of 1986 were used to construct the empirical model of the midnight auroral precipitation during a substorm.
V. G. Vorobjev, O. I. Yagodkina, G. V. Starkov, Ya. I. Feldstein   +3 more
doaj   +1 more source

Near-Earth substorm features from multiple satellite observations [PDF]

, 2008
We investigate a substorm on 3 October 2004 during which 11 satellites were located in near-Earth magnetotail (XGSM > −10 RE). Double Star 1 (TC-1), Cluster, and LANL-97 satellites were closely aligned in the dawn-dusk direction (
A. T. Y. Lui (7591487), M. G. Henderson (7591460), Grocott A, Shen C, Kistler, L., Henderson MG, Alexeev, I., Lui, A. T. Y., Alexeev IV, Lui ATY, Mouikis C, T. L. Zhang (7591511), Fazakerley, A. N., Dunlop, M., Shen, C., Kistler LM, Dunlop, M. W., Zhang, T., Rème, H., Volwerk, M., Henderson, M., Lester, M., Kistler, L. M., Lester M, Alexeev, I. V., Grocott, A., M. Lester (7589660), A. N. Fazakerley (7591259), C. Shen (1630555), Zhang TL, Zhang, T. L., Lui, A., J. K. Shi (7591508), Fazakerley, A., Shi JK, M. Volwerk (7591490), Walsh AP, Adrian Grocott (7590026), Shi, J., Walsh, A., C. Mouikis (7591502), L. M. Kistler (7591505), M. W. Dunlop (7591493), I. V. Alexeev (7591496), Dunlop MW, H. Rème (7591274), Mouikis, C., Henderson, M. G., Volwerk M, Rème H, Walsh, A. P., Shi, J. K., A. P. Walsh (7591499), Fazakerley AN   +53 more
core   +1 more source