Results 21 to 30 of about 312 (156)

Variability of equatorial counter electrojet signatures in the Indian region [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractThe limited longitudinal extent of equatorial counter electrojet (CEJ) has been inferred by several workers based on the analysis of ground data. However, the scale length of CEJ characteristics at 2 h or less has not been estimated so far. The present study seeks to characterize the longitudinal variability of CEJ phenomena at a longitudinal ...
N Phani Chandrasekhar, R K Archana, Nandini Nagarajan   +2 more
exaly   +2 more sources

Intense Equatorial Electrojet and Counter Electrojet Caused by the 15 January 2022 Tonga Volcanic Eruption: Space‐ and Ground‐Based Observations

Geophysical Research Letters, 2022
Abstract We present space‐ and ground‐based multi‐instrument observations demonstrating the impact of the 2022 Tonga volcanic eruption on dayside equatorial electrodynamics. A strong counter electrojet (CEJ) was observed by Swarm and ground‐based magnetometers on 15 January after the Tonga eruption and during the recovery phase of a ...
G Le, Guiping Liu, Endawoke Yizengaw
exaly   +2 more sources

Equatorial electrojet at African longitudes: first results from magnetic measurements [PDF]

Annales Geophysicae, 1998
In the framework of the French participation in the International Equatorial Electrojet Year (IEEY), ten magnetotelluric stations were installed between November 1992 and November 1994 along a 1200-km-long meridian profile, between Lamto (latitude 6.2°
V. Doumouya, J. Vassal, Y. Cohen, O. Fambitakoye, M. Menvielle   +4 more
doaj   +3 more sources

The Variation of Counter-Electrojet Current at the Southeast Asian Sector during Different Solar Activity Levels

Applied Sciences, 2022
Studies on counter-electrojet currents (CEJ) using ground data revealed that this current could occur simultaneously among locations that are less than 30° longitude apart.
Nur Izzati Mohd Rosli, Nurul Shazana Abdul Hamid, Mardina Abdullah, Khairul Adib Yusof, Akimasa Yoshikawa, Teiji Uozumi, Babatunde Rabiu   +6 more
doaj   +5 more sources

Prompt penetration effects on Equatorial Electrojet from the Indian sector

Earth, Planets and Space, 2023
The morphology of prompt penetration effects (PP) in the Equatorial Electrojet (EEJ) at Vencode (VEN, Geomagnetic latitude 0.29ºN) was studied using 5-min samples of EEJ and interplanetary Ey component data from 2011 to 2015.
R. K. Archana, Kusumita Arora, Nandini Nagarajan   +2 more
doaj   +1 more source

Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum [PDF]

Annales Geophysicae, 2017
In this work, we investigated the veracity of an ion continuity equation in controlling equatorial ionization anomaly (EIA) morphology using total electron content (TEC) of 22 GPS receivers and three ground-based magnetometers (Magnetic Data ...
O. Bolaji, O. Bolaji, O. Owolabi, E. Falayi, E. Jimoh, A. Kotoye, O. Odeyemi, B. Rabiu, P. Doherty, E. Yizengaw, Y. Yamazaki, J. Adeniyi, R. Kaka, K. Onanuga   +13 more
doaj   +1 more source

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study [PDF]

Annales Geophysicae, 2009
The electrodynamic effects on the low-mid latitude ionospheric region have been investigated using GPS (global positioning system) data, ionosonde data and ΔH values, during the very large solar flare (X17.2/4B) of 28 October 2003.
G. Manju, T. K. Pant, C. V. Devasia, S. Ravindran, R. Sridharan   +4 more
doaj   +1 more source

Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events [PDF]

Annales Geophysicae, 2009
The present study demonstrates the relationship between the high latitude northern hemispheric major sudden stratospheric warming (SSW) events and the reversal in the afternoon equatorial electrojet (EEJ), often called the counter-electrojet (CEJ ...
S. Sridharan, S. Sathishkumar, S. Gurubaran   +2 more
doaj   +1 more source

Characterizations of the diurnal shapes of OI 630.0 nm dayglow intensity variations: inferences [PDF]

Annales Geophysicae, 2002
Measurements of OI 630.0 nm thermospheric dayglow emission by means of the Dayglow Photometer (DGP) at Mt. Abu (24.6° N, 73.7° E, dip lat 19.09° N), a station under the crest of Equatorial Ionization Anomaly (EIA), reveal day-to-day changes in the ...
D. Chakrabarty, D. Chakrabarty, R. Sekar, H. Chandra, R. Narayanan, B. M. Pathan, K. S. V. Subbarao   +6 more
doaj   +1 more source

On the origin of pre-reversal enhancement of the zonal equatorial electric field [PDF]

Annales Geophysicae, 2009
In November 2004, a large and variable interplanetary electric field (IEF) was felt in the reference frame of the Earth. This electric field penetrated to the magnetic equator and, when the Jicamarca Radio Observatory (JRO) was in the dusk sector ...
M. C. Kelley, R. R. Ilma, G. Crowley
doaj   +1 more source