Results 41 to 50 of about 501,910 (164)

Equatorial Counter-Electrojet and Magnetic Pulsations.

Journal of geomagnetism and geoelectricity, 1997
The signal amplitudes in the Hx component of magnetic pulsations undergo significant enhancement at the dip equator during intervals of Equatorial Electrojet (EEJ), the enhancement attaining a peak value during prenoon hours. On the other hand, it is shown in this study, that the enhancement peak which occurs during prenoon hours on EEJ days shifts ...
T. S. Sastry, S. V. S. Sarma
openaire   +2 more sources

Effects of electrojet turbulence on a magnetosphere-ionosphere simulation of a geomagnetic storm [PDF]

, 2017
Ionospheric conductance plays an important role in regulating the response of the magnetosphere‐ionosphere system to solar wind driving. Typically, models of magnetosphere‐ionosphere coupling include changes to ionospheric conductance driven by extreme ...
Dimant, Y., Liu, J., Lyon, J.G., Merkin, V., Oppenheim, M., Sitnov, M.I., Stephens, G.K., Toffoletto, F., Wang, W., Wiltberger, M., Zhang, B.   +10 more
core   +1 more source

On the height variation of the E-region cowling conductivity ? effect of charged dust particles [PDF]

, 2006
International audienceHeight profiles of the Cowling conductivity in the electrojet region, estimated using the atmospheric parameters given by the existing models like CIRA or MSIS and measured electron density profiles, consistently show the heights of
Kulkarni, V. H., Muralikrishna, P.
core   +2 more sources

Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event [PDF]

, 2016
We present solar quiet (Sq) variation of the horizontal (H) magnetic field intensity deduced from Magnetic Data Acquisition System (MAGDAS) records over Africa during an unusual strong and prolonged 2009 sudden stratospheric warming (SSW) event.
Amory-Mazaudier, C., Bolaji, O.S., Fujimoto, A., Okoh, D., Onanuga, O.K., Owolabi, O.P., Oyeyemi, E.O., Rabiu, A.B., Seemala, G.K., Yamazaki, Yosuke, Yoshikawa, A.   +10 more
core   +4 more sources

Counter‐Electrojet Occurrence as Observed From C/NOFS Satellite and Ground‐Based Magnetometer Data Over the African and American Sectors

Space Weather, 2019
An analysis of the counter‐electrojet occurrence (CEJ) during 2008–2014 is presented for the African and American sectors based on local daytime (0700–1700 LT) observations from the Communications and Navigation Outage Forecasting System (C/NOFS ...
J. Habarulema, Gabrielle Lefebvre, M. Moldwin, Z. Katamzi‐Joseph, E. Yizengaw   +4 more
semanticscholar   +1 more source

Occurrence of blanketing E_s layer (E_sb) over the equatorial region during the peculiar minimum of solar cycle 24 [PDF]

Annales Geophysicae, 2014
A thin and highly dense sporadic E layer, which can occasionally block the upper ionospheric layers, is called blanketing sporadic E (Esb). We present the statistical seasonal local time occurrence pattern of Esb at equatorial station Tirunelveli (8 ...
V. Yadav, B. Kakad, C. K. Nayak, G. Surve, K. Emperumel   +4 more
doaj   +1 more source

Solar cycle dependent characteristics of the equatorial blanketing E_s layers and associated irregularities [PDF]

Annales Geophysicae, 2006
The occurrence of blanketing type Es (Esb) layers and associated E-region irregularities over the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip ~0.5°) during the summer solstitial months of May, June, July and August has ...
C. V. Devasia, V. Sreeja, S. Ravindran
doaj   +1 more source

A study on the variability of ionospheric total electron content over the East African low-latitude region and storm time ionospheric variations [PDF]

, 2016
The variation of total electron content (TEC) derived from the International Global Navigation Satellite Systems Service receiver (formerly IGS) over the East African low-latitude region from up to 12 observation stations for the period 2012 was analyzed.
Baki, P., Cilliers, P. J., Doherty, P., Olwendo, O. J., Yamazaki, Yosuke   +4 more
core   +1 more source

The initial steps for developing the South american K index from the embrace magnetometer network [PDF]

, 2015
In this paper we present the first steps given towards the development of the South American K index (Ksa) based on the measurements made by the Embrace Magnetometer Network.
Da Silva, Marlos Rockenbach, Denardini, Clezio Marcos, Fagundes, Paulo Roberto, Gende, Mauricio Alfredo, Lopes Padilha, Antonio, Moro, Juliano, Petry, Adriano, Resende Araújo, Laysa Cristina, Riberiro Alves, Livia, Sant’Anna, Nilson, Schuch, Nelson Jorge, Su Chen, Sony   +11 more
core   +3 more sources

High‐Precision Prediction of Auroral Substorm Expansion Phase Evolution Using a Spatio‐Temporal Attention Deep Learning Model

Space Weather, Volume 24, Issue 2, February 2026.
Abstract Auroral substorms are a key manifestation of solar‐terrestrial interactions and the release of energy within the Earth's magnetosphere. The expansion phase, which is characterized by rapid changes in auroral morphology and intensity, poses significant space weather risks to satellite operations and communication systems.
Qiuju Yang, Xiaojian Cao, Yong Wang, Zanyang Xing   +3 more
wiley   +1 more source