Results 61 to 70 of about 118,766 (238)

Equatorial airglow and the ionospheric geomagnetic anomaly [PDF]

Journal of Geophysical Research, 1973
OGO D observations of OI (6300A) emissions reveal a global pattern in the equatorial airglow undetected from the ground-based observations. The post sunset emission rate of OI is generally asymmetrical with respect to the geomagnetic equator and shows no apparent correlation with the ultraviolet airglow (OI 1304 and 1356A) and F region electron density
S. Chandra, E. I. Reed, B. E. Troy, Jacques E. Blamont   +3 more
openaire   +1 more source

He+ dominance in the plasmasphere during geomagnetically disturbed periods: 1. Observational results [PDF]

, 2002
Observations made by the DMSP 1710 satellite during the recovery phase from geomagnetic disturbances in June 1991 show regions of He+ dominance around 830 km altitude at 09:00 MLT.
Wilford, C. R., Bailey, G.J., G. J. Bailey, Denton, M.H., Bailey, G. J., Wilford, C.R., Rodger, A. S., Rodger, A.S., Venkatraman, S., Denton, M. H., C. R. Wilford, A. S. Rodger, S. Venkatraman, M. H. Denton   +13 more
core   +2 more sources

Tidal Variability in the Lower Thermosphere: Relative Importance of ENSO, QBO, PJO, MJO, and Lyα

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract Atmospheric tides in the lower thermosphere play an important role in regulating upper‐atmospheric conditions relevant to space weather. However, their spatial and temporal variability remains poorly understood, apart from seasonal variations. Previous studies have shown that tides can be influenced by meteorological and solar conditions. This
Yosuke Yamazaki, Huixin Liu, Kaoru Sato, Dai Koshin, Claudia Stolle   +4 more
wiley   +1 more source

Equatorial electrojet as part of the global circuit: a case-study from the IEEY [PDF]

Annales Geophysicae, 1998
Geomagnetic storm-time variations often occur coherently at high latitude and the day-side dip equator where they affect the normal eastward Sq field. This paper presents an analysis of ground magnetic field and ionospheric electrodynamic data related
A. T. Kobea, C. Amory-Mazaudier, J. M. Do, H. Lühr, E. Houngninou, J. Vassal, E. Blanc, J. J. Curto   +7 more
doaj   +1 more source

Longitudinal correlation of equatorial ionospheric scintillation [PDF]

Radio Science, 2006
Studies at the Air Force Research Laboratory are investigating methods for the incorporation of expected data sets from the Communication/Navigation Outage Forecast System (C/NOFS) satellite into existing scintillation specification models for an improved knowledge of the regional scintillation environment.
Ron Caton, Keith Groves
openaire   +1 more source

Thermal Structure of the Equatorial Topside Ionosphere [PDF]

, 1972
151-153The thermal structure of the equatorial topside ionosphere is theoretically investigated to explain the experimentally observed features, viz. (i) isothermal region in the 400-500 km range, (ii) close coupling of electron and ion temperatures, and
Singh, Risal, Rao, B. C. Narasinga
core  

Daily Peak Activity of the African Lightning Chimney Based on Meteosat Third Generation (MTG) Lightning Imager (LI), World Wide Lightning Location Network (WWLLN), and Schumann Resonance (SR) Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract Lightning activity is strongly concentrated in tropical continental “chimneys”, among which the African lightning chimney stands out as the most intense globally. However, until recently, the incomplete and spatially uneven detection efficiency of ground‐based lightning networks, together with the limited spatio‐temporal coverage of satellite ...
K. Németh, E. Williams, Q. Wang, A. Neska, G. Sátori, M. Herein, T. Haszpra, P. Steinbach, T. Bozóki   +8 more
wiley   +1 more source

Generation of large-scale equatorial F-region plasma depletions during lowrange spread-F season [PDF]

Annales Geophysicae, 2004
All-sky imaging observations of the F-region OI 630nm nightglow emission allow us to visualize large-scale equatorial plasma depletions, generally known as trans-equatorial plasma bubbles. Strong range type spread-F is the radio signature of these
Y. Sahai, P. R. Fagundes, J. R. Abalde, A. A. Pimenta, J. A. Bittencourt, Y. Otsuka, V. H. Rios   +6 more
doaj   +1 more source

Saturn's Ionosphere: Some Evidence of Equatorial Anomaly [PDF]

, 1985
143-146Electron density profiles obtained from radio science experiments on Pioneer-11, Voyager-1 and Voyager-2 have been analyzed to look for equatorial anomaly in the ionosphere of Saturn. Although there is no measurement right at the magnetic equator,
Srilakshmi, M V, Mahajan, K K, Kar, J
core  

An Innovative Approach for Estimating Coseismic Surface Uplifts Using Ionospheric Observations From Remote GNSS Stations: First Application for the 2025 Myanmar Earthquake

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract The Mw 7.7 Myanmar earthquake on 28 March 2025 ruptured ∼480 km of the Sagaing Fault. Its fault slip distribution remains poorly constrained by three‐dimensional surface displacement data due to sparse GNSS‐coverage near the fault. Satellite‐based synthetic aperture radars capture meters of right‐lateral displacements but isolating vertical ...
Mala S. Bagiya, Shubham K. Rajewar, Kosuke Heki, Vineet K. Gahalaut, Neeraj Gurjar, A. P. Dimri   +5 more
wiley   +1 more source