Results 71 to 80 of about 501,910 (164)

Properties of Earthward and Tailward High‐Speed Plasma Flows in Earth's Distant Magnetotail: Solar Cycle and Geomagnetic Activity Dependence

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract High‐speed plasma flows in Earth's magnetotail are important for the global dynamics of the magnetosphere. We survey 11 yrs of high‐speed plasma flows observed by the ARTEMIS spacecraft in Earth's distant magnetotail between XGSE = −52 RE and XGSE = −66 RE to investigate their properties for a wide range of solar and geomagnetic activity ...
Anissa Pokorny‐Yadav, Marit Øieroset, Tai D. Phan, Andrei Runov, Vassilis Angelopoulos   +4 more
wiley   +1 more source

VAMPIRE: Using a Random Forest to Forecast Earth's Outer Van Allen Radiation Belt

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The outer Van Allen radiation belt is highly dynamic in both strength and location, being driven by several distinct physical processes, making it difficult to predict for spacecraft operators. Forecasting models exist, in part, to minimise potential damage caused by this natural hazard.
D. J. Weston, I. J. Rae, A. W. Smith, K. R. Murphy, C. E. J. Watt, F. X. Bocquet, S. Bingham, E. M. Henley   +7 more
wiley   +1 more source

Spatial variability of solar quiet fields along 96° magnetic meridian in Africa:results from MAGDAS [PDF]

, 2015
We have used chains of Magnetic Data Acquisition System (MAGDAS) magnetometer records of the horizontal (H) and vertical (Z) magnetic field intensities during September 2008 to August 2009 (year of deep minimum) across Africa to study their variability ...
Bello, O. R., Bolaji, O. S., Odeyemi, O. O., Ogunmodimu, Olugbenga, Rabiu, Babatunde, Yoshikawa, A.   +5 more
core   +1 more source

FHD: An Extended Disturbance Storm‐Time Index Based on Fitted Functions of Horizontal Geomagnetic Field Variation

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract The significant decrease in the global horizontal geomagnetic field is a key indicator of global magnetic storms and serves as the fundamental basis for deriving traditional disturbance storm‐time indices in space weather monitoring. The disturbance intensity varies across regions and with magnetic local time, highlighting the need for more ...
Zhaobo He, Liguo Jiao, Gaochuan Liu, Xiaoyu Shen, Jiyao Tu, Weinan Wang, Kunjie Sun   +6 more
wiley   +1 more source

Statistical Analysis of Storm‐Time O+ Outflows as Observed by the Van Allen Probes

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract The outflow of low‐energy O+ ${\mathrm{O}}^{+}$ ions into inner magnetosphere is a key contributor to the warm plasma cloak, and O+ torus, which can also contribute to storm time ring current particularly after local acceleration. Although O+ ${\mathrm{O}}^{+}$ outflows are well observed, their source and transport in the inner magnetosphere ...
Aditi Upadhyay, Matina Gkioulidou, Shin‐ichi Ohtani, Ian J. Cohen   +3 more
wiley   +1 more source

Observations of the Earth's magnetic field from the Space Station: Measurement at high and extremely low altitude using Space Station-controlled free-flyers [PDF]

Simulation studies established that the main (core), crustal and electrojet components of the Earth's magnetic field can be observed with greater resolution or over a longer time-base than is presently possible by using the capabilities provided by the ...
Frawley, J. J., Stefanik, M., Webster, W., Jr.   +2 more
core   +1 more source

トウナン アジア チイキ ニオケル セキドウ ジェット デンリュウ ノ タイヨウ カツドウ イゾンセイ [PDF]

, 2013
赤道ジェット電流(equatorial electrojet: EEJ)は,昼側磁気赤道直下における電離層電気伝導度の局所的増強に起因する電流系である.我々は,波長10.7 cmの太陽電波強度(F10.7)を太陽活動度の指標として用いて,EEJ強度の太陽活動度依存性を調査した.本研究で我々は,MAGDAS/CPMN 観測網のデータを用いて新しく構築されたEEJ指数の一つの成分であるEUEL指数のうち,2011 年の東南アジア地域のデータから算出されたEUEL 指数を解析に用いた.磁気赤道から±3 ...
Huixin Liu, Huixin Liu, Kiyohumi Yumoto, Nurul Shazana Abdul Hamid, Nurul Shazana Abdul Hamid, Teiji Uozumi, 湯元 清文, 魚住 禎司   +7 more
core   +1 more source

The longitudinal variability of equatorial electrojet and vertical drift velocity in the African and American sectors [PDF]

, 2014
While the formation of equatorial electrojet (EEJ) and its temporal variation is believed to be fairly well understood, the longitudinal variability at all local times is still unknown.
A. Mebrahtu, B. Damtie, B. Rabiu, C. F. Valladares, C. M. Biouele, E. Yizengaw, E. Zesta, M. B. Moldwin, R. Stoneback   +8 more
core   +1 more source

Indices of equatorial electrojet and counter-electrojet in the Indian region: Evolution of the indices and their authenticity

Journal of Earth System Science, 1983
Indices of the equatorial electrojet and counter-electrojet in the Indian region have been evolved based on certain reasonable assumptions, by a criterion depending on the difference in the horizontal field strength between a station under the electrojet axis (Trivandrum) and a station outside the jet influence (Alibag).
B N Bhargava, B R Arora, N S Sastri
openaire   +2 more sources

The Performance of DIXSG on Characterizing Global and Regional Ionospheric Disturbances Utilizing Geodetic Receiver Network‐A Case Study

Space Weather, Volume 23, Issue 10, October 2025.
Abstract As the 25th solar cycle enters a highly active phase, the resulting ionospheric irregularities induce disturbances in signals of Global Navigation Satellite System (GNSS), significantly disrupting its global stable positioning, navigation, and timing services.
Dongsheng Zhao, Xueli Zhang, Peicheng Zhang, Hao Liu, Kefei Zhang, Wang Li, Andong Hu, Longjiang Li, Shuanglei Cui, Yuhao Hou, Craig M. Hancock, Andrzej Krankowski   +11 more
wiley   +1 more source