Results 141 to 150 of about 501,910 (164)

Temporal characteristics of the Equatorial Electrojet and Counter Electrojet over Ethiopian sector

Advances in Space Research, 2015
Abstract In this paper, we reported on a case study of the temporal characteristics of the Equatorial Electrojet (EEJ) and Counter Electrojet (CEJ) over Ethiopian sector during an interval on August 27, 2008 inferred from ground-based magnetometer observations.
Endalkachew Mengistu, Tsegaye Kassa
semanticscholar   +2 more sources

Characteristics of Counter Electrojet Using Multi‐Spacecraft Swarm Observations

Journal of Geophysical Research: Space Physics
The characteristics of the westward ionospheric current flowing at the geomagnetic equator, known as Counter Electrojet (CEJ), are studied here using multi‐satellite Swarm mission magnetic field data collected during January 2014 to March 2021.
J. Sreelakshmi, G. Vichare
semanticscholar   +2 more sources

Solar flare effects in equatorial counter electrojet currents

Nature, 1975
THE solar flare effect on the horizontal component of the geomagnetic field (H) during the period of counter equatorial electrojet current is characterised by a negative crochet (decrease of the H field) at an equatorial electrojet station and a positive crochet (increase of H field) at a low latitude station outside the electrojet belt.
R. Rastogi, M. R. Deshpande, N. Sastri
semanticscholar   +2 more sources

HF radar studies of two‐stream instability during an equatorial counter‐electrojet

Journal of Geophysical Research: Space Physics, 1979
A very strong daytime counter‐electrojet was observed on January 21, 1977, near the magnetic equator in Africa. This phenomenon was investigated for the first time using simultaneous magnetic and radar measurements. As predicted by the linear theory, irregularities associated with the two‐stream instability were detected in the absence of the usual ...
M. Crochet, C. Hanuise, P. Broche
semanticscholar   +2 more sources

Quiet Time Counter Equatorial Electrojet

The Equatorial Electrojet, 2019
C. Onwumechili
semanticscholar   +2 more sources

Equatorial Electrojet and Counter Electrojet caused by the 15 January 2022 Tonga Volcanic Eruption

2023
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 moderate geomagnetic storm ...
Guan Le, Guiping Liu, Endawoke Yizengaw, Christoph Englert   +3 more
openaire   +1 more source

Distortions in the height structure of the equatorial electrojet during counter electrojet events

Journal of Atmospheric and Terrestrial Physics, 1994
This paper presents simultaneous observations made near the magnetic equator during counter electrojet events using a coherent VHF backscattcr radar, magnetometer and digital ionosonde to understand the physical processes that generate the counter electrojet conditions.
V.V. Somayajulu, K.S. Viswanathan, K.S.V. Subbarao, L. Cherian   +3 more
openaire   +1 more source

5‐ to 50‐m wavelength plasma instabilities in the equatorial electrojet 3. Counter‐electrojet conditions

Journal of Geophysical Research: Space Physics, 1981
Measurements of plasma instabilities in the equatorial electrojet with HF and VHF radars have always been performed in a large scale turbulent medium. It is only in the exceptional case of a strong daytime counter‐electrojet, as observed in Africa in 1977, that the background can be considered as almost laminar.
C. Hanuise, M. Crochet
openaire   +1 more source

Equatorial counter-electrojet and the F2-layer of the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1989
It is shown that the quiet day afternoon counter-electrojet events at equatorial stations are the result of a strong semi-diurnal tidal force, with a maximum around 0900 LT and a minimum around 1500 LT, superimposed over the normal Sq (H) variation.
R.G. Rastogi, A. Patil
openaire   +1 more source

Counter equatorial electrojet currents in the Indian zone

Planetary and Space Science, 1973
The paper describes the phenomenon of afternoon depression of the geomagnetic H field on quiet days near the magnetic equator in the Indian zone. These events occur most frequently around 1600 solar hr and are localized in longitude; sometimes, not seen at stations separated by even 2 hr LT.
openaire   +1 more source