Results 101 to 110 of about 4,523 (241)

Evolution of the near-Earth magnetotail associated with substorm onsets: revisiting the issues of onset timing and substorm triggering mechanism

Earth, Planets and Space
The triggering mechanism of the substorm onset has been a major issue in magnetospheric research. Various models have been proposed so far. To understand the causal relationship of magnetotail processes associated with substorm onsets, our previous ...
Yukinaga Miyashita, Akimasa Ieda, Shinobu Machida   +2 more
doaj   +1 more source

Circularly Expanding Ring‐Shaped Pulsating Aurora Visualizing the Source of Plasma Waves in Space

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Pulsating aurorae are prominent auroral emissions in the polar regions, typically occurring in the morning hours during the recovery phase of auroral substorms. These aurorae usually consist of round‐shaped patches of emission, with luminosity that pulsates at intervals ranging from less than a second to several tens of seconds.
K. Hosokawa, S. Kurita, Y. Miyoshi, S.‐I. Oyama, Y. Ogawa, M. Ozaki, Y. Kasahara, Y. Kasaba, S. Yagitani, S. Matsuda, F. Tsuchiya, A. Kumamoto, A. Matsuoka, S. Imajo, T. Raita, E. Turunen, T. Takashima, I. Shinohara, R. Fujii   +18 more
wiley   +1 more source

Solar Wind–Magnetosphere–Ionosphere Coupling Under Extreme External Driving: Characteristics of Dayside Ground Magnetic Disturbances

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract The objective of the present study is to investigate solar wind‐magnetosphere‐ionosphere coupling (SWMIC) under intense external driving in terms of dayside ground magnetic disturbances. Dayside magnetic reconnection drives a region‐1 sense current system, the SWMIC current system.
Shinichi Ohtani
wiley   +1 more source

Ion Anisotropy in Earth's Magnetotail: Importance of High‐Energy Ions

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract The reconfiguration of the magnetotail current sheet during substorms often includes the formation of a thin current sheet (TCS) with a strong magnetic field line tension force. This force cannot be balanced by isotropic plasma pressure gradients, and force balance in such a TCS requires ion anisotropy and/or agyrotropy of plasma pressure.
Xiaofei Shi, Vassilis Angelopoulos, Louis Richard, Anton Artemyev   +3 more
wiley   +1 more source

Magnetotail Source of Premidnight Upward Field‐Aligned Currents: Nature of the Substorm Current System

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract The substorm current wedge constitutes the backbone of the substorm current system. Its field‐aligned current components include an upward current in the premidnight sector and a downward current in the midnight‐morning sector, which connect the auroral ionosphere to the magnetotail.
Tsugunobu Nagai, Iku Shinohara
wiley   +1 more source

Multi-instrument observations of the ionospheric counterpart of a bursty bulk flow in the near-Earth plasma sheet [PDF]

, 2004
International audienceOn 07 September 2001 the Cluster spacecraft observed a "bursty bulk flow" event in the near-Earth central plasma sheet. This paper presents a detailed study of the coincident ground-based observations and attempts to place them ...
Tim K. Yeoman (7583066), Rème, H., S. W. H. Cowley, Frey, H.U., H. U. Frey, H. Rème, Nakamura, R., Klecker, B., S. W. H. Cowley (7590302), H. Rème (7591274), Cowley, S.W.H., Grocott, A., R. Nakamura (7591343), H. U. Frey (7591265), Adrian Grocott (7590026), T. K. Yeoman, Cowley, S. W. H., A. Grocott, B. Klecker, B. Klecker (7591355), Frey, H. U., Yeoman, T. K., Yeoman, T.K., R. Nakamura   +23 more
core   +1 more source

Comparative Dynamics of Substorms and Sawtooth Events

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present a comprehensive comparative analysis of magnetospheric substorms and sawtooth events using multi‐point observations from ground‐based magnetometers, geostationary satellites, and the Time History of Events and Macroscale Interactions during Substorms mission.
C. C. DiMarco, T. I. Pulkkinen, R. L. McPherron, M. G. Henderson, J. W. Gjerloev   +4 more
wiley   +1 more source

Importance of High Cadence Magnetometer Data for Investigating Geomagnetic Disturbances

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Geomagnetic disturbances (GMDs) are rapid changes in the magnetic field of the Earth that may drive geomagnetically induced currents (GICs), known to cause damage to infrastructure such as power grids and pipelines. Globally, GIC measurements are often hard to obtain; therefore, GMDs are used as a proxy for GICs.
G. E. Bower, S. M. Imber, S. E. Milan, C. Beggan, J. W. Gjerloev   +4 more
wiley   +1 more source

Simultaneous ionospheric and magnetospheric observations of azimuthally propagating transient features during substorms [PDF]

, 1998
International audienceDuring the 6th August 1995, the CUTLASS Finland HF radar ran in a high time resolution mode, allowing measurements of line-of-sight convection velocities along a single beam with a temporal resolution of 14 s.
Tim K. Yeoman (7583066), Mukai, T., Yamamoto, T., T. K. Yeoman, T. Mukai, T. Yamamoto, T. Mukai (7612310), T. Yamamoto (3689515), Yeoman, T. K., Yeoman, T.K.   +9 more
core   +1 more source

Dynamics for geomagnetic pulsations, field-aligned currents, and airglow at mid-latitudes within substorm activations during superstorms

Геодинамика и тектонофизика, 2019
Within substorm activations during two superstorms (2000 and 2003) from the observations at mid-latitude geomagnetic observatories, we study short-period irregular geomagnetic pulsations and airglow in the 557.7 nm and 630.0 nm atomic oxygen emission ...
Yu. Yu. Klibanova, V. V. Mishin, A. V. Mikhalev, B. Tsegmed, Yu. A. Karavaev, M. A. Kurikalova   +5 more
doaj   +1 more source