Results 31 to 40 of about 1,041 (168)

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

Intense Equatorial Electrojet and Counter Electrojet caused by the 15 January 2022 Tonga Volcanic Eruption: Space and Ground-based Observations

Geophysical Research Letters, 2022
AbstractWe 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 moderate geomagnetic
Guan Le, Guiping Liu, Endawoke Yizengaw, Christoph R. Englert   +3 more
openaire   +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

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

Mean winds and tidal components during counter electrojet events

Geophysical Research Letters, 1993
The first observations of mean winds and the amplitude and phases of the tidal components measured with a meteor wind radar located at Trivandrum (8.5°N, 77°E) during five consecutive days of counter electrojet events identified in the horizontal component of the earth's magnetic field from January 27–31, 1987 are described. The mean zonal winds in the
V. V. Somayajulu, Ligi Cherian, K. Rajeev, Geetha Ramkumar, C. Raghava Reddi   +4 more
openaire   +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

Vertical winds as a plausible cause for equatorial counter electrojet

Geophysical Research Letters, 1980
The signatures of the counter‐electrojet that occurs in the afternoon hours as recorded on the ground and satellite‐borne magnetometers during the magnetically quiet days, clearly indicate reversal of the jet current in a narrow latitude region centered around the dip equator.
R. Raghavarao, B. G. Anandarao
openaire   +1 more source

Simultaneous Observations of Electron Phase Space Density Variations in the Geostationary Orbit by GK2A, GOES‐16, and GOES‐17

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract This study presents simultaneous measurements of electron phase space density (PSD) gradients in geostationary orbit using data from GK2A, GOES‐16, and GOES‐17. By leveraging a three‐satellite configuration, we provide statistical results of PSD gradient estimation in invariant coordinates.
N.‐Y. Lee, J. Seon, G. W. Na, C.‐H. Lee, W.‐H. Seol, K.‐C. Kim   +5 more
wiley   +1 more source

Geomagnetic field variations at the equatorial electrojet station in Sri Lanka, Peredinia [PDF]

, 2004
The paper discusses the variations of the horizontal (<i>H</i>), vertical (<i>Z</i>) and eastward (<i>Y</i>) components of the geomagnetic field at Peredinia (PRD), an electrojet station in Sri Lanka, with the time of ...
K. Kitamura, R. G. Rastogi, T. Kitamura
core   +1 more source