Results 41 to 50 of about 4,955 (149)

Cross‐field current instability for auroral bead formation in breakup arcs

Geophysical Research Letters, 2016
The physical process responsible for the onset of substorm expansion is still unresolved in spite of decades of research on the topic. Detailed properties of the spatially periodic auroral beads on prebreakup auroral arcs that initiate substorm expansion
A. T. Y. Lui
doaj   +1 more source

Observational Analysis on the Relationship Between Chorus Waves and MeV Microburst Electron Precipitation

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract Microbursts are thought to be a key contributor to radiation belt electron loss, with chorus waves considered a primary driver of this precipitation. However, the conditions under which chorus waves produce MeV electron loss remain poorly constrained.
Jorge Romero‐Minaya, Lauren W. Blum, Longzhi Gan, Xiao Chen   +3 more
wiley   +1 more source

IMF By‐Controlled Dawn–Dusk and Hemispheric Asymmetries of Kelvin–Helmholtz Waves and Reconnection Geometry Under Negative Dipole Tilt

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract Along with magnetic reconnection, Kelvin‐Helmholtz (KH) waves are the main mechanisms controlling the solar wind‐magnetosphere interaction, enabling plasma transport into the magnetosphere due to secondary reconnection, diffusion and wave‐particle interactions.
L. Holappa, K. Nykyri, J. Laitinen, B. Burkholder   +3 more
wiley   +1 more source

Substorm Effects on Chorus Emissions Modulated by ULF Waves

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract Although cross‐scale wave‐particle interactions play a critical role in energy transfer in the magnetosphere, the influence of geomagnetic activity on the physical mechanisms involved remains unclear. In this study, we investigate this question by analyzing Van Allen Probes‐A observations of an event occurring on 25 July 2016.
Xing‐Yu Li, Qiu‐Gang Zong, Shan Wang, Xu‐Zhi Zhou, Chao Yue, Robert Rankin, Li Li, Yong‐Fu Wang, Yi‐Xin Sun, Hua‐Yun Shen, Bin He, Yong Wu   +11 more
wiley   +1 more source

Magnetospheric and auroral activity during the April 18, 2002 sawtooth event. [PDF]

, 2006
We examine the 18 April 2002 sawtooth event. We find that the strong magnetic field dipolarizations observed in association with each tooth are not global in occurrence but are rather confined to the nightside.
Skoug, R., Thomsen, M .F., Reeves, G. D., Mende, S. B., Immel, T. J., Denton, Michael H., Henderson, M. G., Brandt, P. C., Singer, H.   +8 more
core   +4 more sources

The Extreme GIC Occurrence During 11 years of Observations in the North‐West of Russia

Space Weather
For the first time, events with extreme magnitudes of geomagnetically induced currents (GICs) in the power lines during the quasi‐solar cycle (2012–2022) at auroral and subauroral latitudes are analyzed.
V. B. Belakhovsky, V. A. Pilipenko, V. N. Selivanov, Ya. A. Sakharov, J. J. Zhang, V. V. Kolobov   +5 more
doaj   +1 more source

Dispersive Alfvén Wave Control of O+ Ion Outflow and Energy Densities in the Inner Magnetosphere

Geophysical Research Letters, 2019
The relationship between dispersive Alfvén waves (DAWs), magnetospheric activity, and O+ ion outflow/energy density is examined using measurements from the Van Allen Probes.
A. J. Hull, C. C. Chaston, J. W. Bonnell, J. R. Wygant, C. A. Kletzing, G. D. Reeves, A. Gerrard   +6 more
doaj   +1 more source

Direct Connection Between Auroral Oval Streamers/Flow Channels and Equatorward Traveling Ionospheric Disturbances

Frontiers in Astronomy and Space Sciences, 2021
We use simultaneous auroral imaging, radar flows, and total electron content (TEC) measurements over Alaska to examine whether there is a direct connection of large-scale traveling ionospheric disturbances (LSTIDs) to auroral streamers and associated ...
Larry R. Lyons, Yukitoshi Nishimura, Shunrong Zhang, Anthea Coster, Jiang Liu, Jiang Liu, William A. Bristow, Ashton S. Reimer, Roger H. Varney, Don L. Hampton   +9 more
doaj   +1 more source

Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Pi2 oscillations are known to be associated with cavity mode oscillations (CMOs) in the inner magnetosphere at low latitudes. CMOs can also be excited by interplanetary shocks on the dayside. We present results from a global linear MHD wave model in spherical coordinates that allows us to analyze these waves at equatorial latitudes.
K. Majmudar, R. L. Lysak, K. Takahashi
wiley   +1 more source

The Shock‐Substorm of 24 September 1998: A Different Type of Substorm Trigger Onset

Geophysical Research Letters
An interplanetary shock triggered a substorm with a peak intensity SML = −1,781 nT on 24 September 1998. This is called a shock‐substorm here to differentiate it from generic substorms.
Bruce T. Tsurutani, Rajkumar Hajra, Yusuke Ebihara, Gurbax S. Lakhina, Yasuhito Narita, Karl‐Heinz Glassmeier   +5 more
doaj   +1 more source