Results 61 to 70 of about 8,280 (207)

Nighttime Magnetic Perturbation Events Observed in Arctic Canada: 3. Occurrence and Amplitude as Functions of Magnetic Latitude, Local Time, and Magnetic Disturbance Indices

Space Weather, 2021
Rapid changes of magnetic fields associated with nighttime magnetic perturbation events (MPEs) with amplitudes |ΔB| of hundreds of nT and 5–10 min duration can induce geomagnetically induced currents (GICs) that can harm technological systems. This study
Mark J. Engebretson, Viacheslav A. Pilipenko, Erik S. Steinmetz, Mark B. Moldwin, Martin G. Connors, David H. Boteler, Howard J. Singer, Hermann Opgenoorth, Audrey Schillings, Shin Ohtani, Jesper Gjerloev, Christopher T. Russell   +11 more
doaj   +1 more source

AMPTE/CCE‐SCATHA simultaneous observations of substorm‐associated magnetic fluctuations [PDF]

, 1998
This study examines substorm-associated magnetic field fluctuations observed by the AMPTE/CCE and SCATHA satellites in the near-Earth tail. Three tail reconfiguration events are selected, one event on August 28, 1986, and two consecutive events on August
Fennell, J. F., Higuchi, T., Lui, A. T. Y., Ohtani, S., Spence, Harlan E., Takahashi, K.   +5 more
core   +3 more sources

Enhancing Low‐Latitude Ionospheric Irregularity Prediction With Generalized Linear Models

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The ionosphere poses challenges for accurate forecasting due to its complexity and variability. Irregularities in the lower ionosphere are influenced by local time, season, geographic location, solar activity and space weather, complicating precise predictions.
Alysson Brhian, Marco A. Ridenti, Francisco Azpilicueta, Mauricio Gende, Marisa Roberto   +4 more
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

Statistical study on interplanetary drivers behind intense geomagnetic storms and substorms

Earth and Planetary Physics, 2019
Geomagnetic storms and substorms play a central role in both the daily life of mankind and in academic space physics. The profiles of storms, especially their initial phase morphology and the intensity of their substorms under different interplanetary ...
Tian Tian, Zheng Chang, LingFeng Sun, JunShui Bai, XiaoMing Sha, Ze Gao   +5 more
doaj   +1 more source

Model Validation of M‐I Coupling in SWMF

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract The accurate modeling of field‐aligned currents (FAC) and electron precipitation is critical for understanding magnetosphere‐ionosphere coupling and improving space weather predictions. This study evaluates the performance of the SWMF in replicating observed FAC magnitudes and distributions, as well as electron precipitation during storms and ...
Tre'Shunda James, Alex Glocer
wiley   +1 more source

Differences in Ultra‐Low‐Frequency Waves Associated With Dipolarization in the Near‐Earth Magnetotail Between Substorms and Pseudosubstorms

Geophysical Research Letters
We studied the characteristics of ultra‐low‐frequency (ULF) waves associated with dipolarization in the near‐Earth plasma sheet for substorms and pseudosubstorms, employing superposed epoch analysis of data from the Time History of Events and Macroscale ...
Kanpatom Kasonsuwan, Yukinaga Miyashita, Suwicha Wannawichian   +2 more
doaj   +1 more source

Nuclear burst plasma injection into the magnetosphere and resulting spacecraft charging [PDF]

, 1977
The passage of debris from a high altitude ( 400 km) nuclear burst over the ionospheric plasma is found to be capable of exciting large amplitude whistler waves which can act to structure a collisionless shock.
Cipolla, J. A., Golden, K. I., Pavel, A. L., Silevitch, M. B.   +3 more
core   +1 more source

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source

Relation of the auroral substorm to the substorm current wedge [PDF]

Geoscience Letters, 2016
The auroral substorm is an organized sequence of events seen in the aurora near midnight. It is a manifestation of the magnetospheric substorm which is a disturbance of the magnetosphere brought about by the solar wind transfer of magnetic flux from the dayside to the tail lobes and its return through the plasma sheet to the dayside.
McPherron, Robert L., Chu, Xiangning
openaire   +1 more source