Results 41 to 50 of about 1,041 (168)

Spatial frequencies associated with the latitudinal structures of ionospheric currents seen by CHAMP satellite

, 2015
The CHAMP magnetic field variations during international quiet days of low solar activity period 2008-2009 are investigated. The present paper reports the existence of frequency-peaks < 20 mHz in the compressional component of the magnetic field in ...
Sinha, A. K., Thomas, Neethal, Vichare, Geeta   +2 more
core   +1 more source

Frequency Extensions of Auroral Kilometric Radiation: The Key to Unlocking Earth's Radio Response to Substorms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Auroral kilometric radiation (AKR) provides a sensitive probe of magnetospheric dynamics during substorms. We analyze an extended data set of AKR bursts observed by the WIND spacecraft to investigate how the frequency structure of AKR responds to substorm onset and evolution.
Simon James Walker, Caitríona M. Jackman, Alexandra R. Fogg, Siyuan Wu, James E. Waters   +4 more
wiley   +1 more source

Ionospheric irregularity behavior during the September 6–10, 2017 magnetic storm over Brazilian equatorial–low latitudes

Earth, Planets and Space, 2019
The September 6–10, 2017 two-step magnetic storm was caused by an X9 solar flare followed by a CME. The SSC that occurred at 23:43 UT on day 06 when Sym-H reached about 50 nT, was due to a sudden increase in solar wind.
Eurico R. de Paula, Cesar B. A. de Oliveira, Ronald G. Caton, Patricia M. Negreti, Inez S. Batista, André R. F. Martinon, Acácio C. Neto, Mangalathayil A. Abdu, João F. G. Monico, Jonas Sousasantos, Alison O. Moraes   +10 more
doaj   +1 more source

Morning–Afternoon Asymmetry in Correlations Between the Equatorial Electrojet and Sq Westward Currents on Polar‐Side of the Focus

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Equatorial electrojet (EEJ) and solar quiet (Sq) currents with one vortex each in either hemisphere are key components of the ionospheric dynamo currents, driving geomagnetic diurnal variations observed at Earth's surface. However, the physical coupling between EEJ and Sq westward currents on the polar side of the vortex focus remains poorly ...
Xiaocan Liu, Peng Han, Katsumi Hattori, Huaran Chen   +3 more
wiley   +1 more source

Magnetosphere-Ionosphere Coupling Through E-region Turbulence 1: Energy Budget

, 2011
During periods of intense geomagnetic activity, strong electric fields and currents penetrate from the magnetosphere into high-latitude ionosphere where they dissipate energy, form electrojets, and excite plasma instabilities in the E-region ionosphere ...
Amm, Ashrafi, Bahcivan, Bahcivan, Balsley, Buchert, Buneman, Cohen, Crochet, D'Angelo, Dimant, Dimant, Dimant, Dimant, Dimant, Dimant, Erukhimov, Farley, Farley, Fejer, Fontenla, Foster, Fukao, Gogoberidze, Guild, Gurevich, Hamza, Hamza, Hoh, John, Kagan, Kagan, Kelley, Koepke, Kudeki, Landau, Liperovsky, M. M. Oppenheim, Maeda, Merkin, Merkin, Merkin, Milikh, Milikh, Ober, Oppenheim, Pfaff, Pfaff, Pfaff, Pfaff, Providakes, Raeder, Raeder, Robinson, Robinson, Rogister, Rose, Schlegel, Schunk, Siscoe, St.-Maurice, St.-Maurice, St.-Maurice, St.-Maurice, Stauning, Vanhamäki, Wahlund, Wang, Williams, Winglee, Y. S. Dimant   +70 more
core   +1 more source

Solar flares induced D-region ionospheric and geomagnetic perturbations [PDF]

, 2015
The D-region ionospheric perturbations caused by solar flares occurred during January 2010 to February 2011, a low solar activity period of current solar cycle 24, have been examined on NWC transmitter signal (19.8 kHz) recorded at an Indian low ...
Gokani, S., Kumar, Sushil, Maurya, A.K., Phanikumar, D.V., Selvakumaran, R., Siingh, D., Singh, A.K., Singh, R., Veenadhari, B., Venkatesham, K.   +9 more
core   +1 more source

High Latitude Dayside Aurora Ionospheric Electrodynamics Using Data Assimilation

Earth and Space Science, Volume 13, Issue 2, February 2026.
Abstract Under favorable conditions, the interaction between the interplanetary magnetic field (IMF) and Earth's magnetic field can result in a dayside aurora at magnetic latitudes above approximately 80°, referred to as the high latitude dayside Aurora (HiLDA).
Fasil T. Kebede, K. M. Laundal, J. P. Reistad, S. M. Hatch, Larry J. Paxton, Yongliang Zhang   +5 more
wiley   +1 more source

Magma Storage Below Sabancaya Volcano (Southern Peru) Imaged by Broadband Magnetotellurics

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract Sabancaya volcano is one of the most active volcanoes in the Central Andes. Its ongoing eruptive process is accompanied by large‐scale deformation, with activation of the Huambo‐Cabanaconde fault system, marked by intense seismicity over an area of about 50 × 30 km2 ${\mathrm{k}\mathrm{m}}^{2}$.
Jose‐Luis Torres, Svetlana Byrdina, Gonzalo Romero‐Beltran, Stéphane Garambois, Volker Rath, Yanet Antayhua, Marco Rivera, Alain Burgisser, Roger Machacca, Marco Milla, Hernando Tavera, Philip Hering   +11 more
wiley   +1 more source

Responses of Field‐Aligned Currents and Equatorial Electrojet to Sudden Decrease of Solar Wind Dynamic Pressure During the March 2023 Geomagnetic Storm

Geophysical Research Letters
We present the observations of field‐aligned currents and the equatorial electrojet during the 23 March 2023 magnetic storm, focusing on the effect of the drastic decrease of the solar wind dynamic pressure occurred during the main phase.
Guan Le, Guiping Liu, Endawoke Yizengaw, Chin‐Chun Wu, Yihua Zheng, Sarah Vines, Natalia Buzulukova   +6 more
doaj   +1 more source

Simultaneous transients in the auroral zone and the equator as observed with SuperDARN and magnetometers: A correlation with equatorial counter electrojet (CEJ) event [PDF]

, 2000
An equatorial counter electrojet (CEJ) event characterized by a large amplitude (～150 nT) and a short duration (～15 min) magnetic disturbance occurred in the dayside region at 0053 UT, 23 October 1994.
Hiroshi Tachihara, J.M. Ruohoniemi, Manabu Shinohara, N.B. Trivedi,N.B., Natsuo Sato, Osuke Saka, R.A. Greenwald, Tai-ichi Kitamura   +7 more
core   +1 more source