Results 31 to 40 of about 77,336 (163)
Nighttime Enhancements in the Midlatitude Ionosphere and Their Relation to the Plasmasphere [PDF]
Journal of Geophysical Research: Space Physics, 2018 AbstractIn situ electron density measurements by the CHAllenging Minisatellite Payload and the Defense Meteorological Satellites Program F17 satellites show that the midlatitude ionization at altitudes of ∼350 and 850 km is enhanced in the late evening.
Quanhan Li +3 more
openaire +1 more source
Tandem Observations of Nighttime Mid‐Latitude Topside Ionospheric Perturbations
Space Weather, 2023 AbstractNighttime medium‐scale traveling ionospheric disturbances (MSTIDs) have been generally observed by ground‐based instruments. However, they provide 2‐dimensional images over only a limited field of view and are not distributed globally. The ground‐based observations reported that MSTID wavefronts exhibit backward‐C shapes virtually straddling ...
Hosub Song +6 more
openaire +3 more sources
, 2012 Tweek atmospherics are ELF/VLF pulse signals with frequency dispersion characteristics generate from lightning discharges and spread in the Earth-ionosphere waveguide mode.This study uses the electromagnetic wave approach describe as ELF (extremely low ...
Yusop, Norbayah +6 more
core +3 more sources
The dayside high-latitude trough under quiet geomagnetic conditions: Radio tomography and the CTIP model [PDF]
, 2005 International audienceThe dayside high-latitude trough is a persistent feature of the post-noon wintertime auroral ionosphere. Radio tomography observations have been used to map its location and latitudinal structure under quiet geomagnetic conditions ...
Dewis, K. L. +14 more
core +2 more sources
Global morphology of night-time NmF2 enhancements [PDF]
Annales Geophysicae, 2002 An overall statistical study of night-time enhancements of NmF2 has been carried out. All available foF2 observations since 1955 at 53 ionosonde stations distributed worldwide in the latitude range fgeom = 15° - 60° were used in the analysis ...
A. F. Farelo +3 more
doaj +1 more source
Hot O and nighttime ionospheric temperatures
Geophysical Research Letters, 2000 By analysing a large set of St. Santin F region Incoherent Scatter (IS) data for low solar activity we find nighttime ion temperature (Ti) on average to be apparently slightly higher than electron temperature (Te). We show that this difference is a bias incurred by the IS spectral analysis procedure owing to the neglect of H+ ions in the 300–500 km ...
Litvin, A. +2 more
openaire +2 more sources
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. +13 more
core +2 more sources
Morphology of the spectral resonance structure of the electromagnetic background noise in the range of 0.1–4 Hz at L = 5.2 [PDF]
Annales Geophysicae, 2003 Continuous observations of fluctuations of the geomagnetic field at Sodankylä Geophysical Observatory (L = 5.2) were used for a comprehensive morphological study of the spectral resonance structure (SRS) seen in the background electromagnetic noise
A. G. Yahnin +5 more
doaj +1 more source
Remote Sensing, 2022 The China Seismo-Electromagnetic Satellite (CSES-01) provides in situ electron density (Ne) observations through Langmuir probes (LPs) in the topside ionosphere since February 2018. CSES-01 is a sun-synchronous satellite probing the ionosphere around two
Alessio Pignalberi +7 more
doaj +1 more source
Substorm Induced Nighttime Plasma Flow Pulsations Observed by ROCSAT‐1 at Topside Ionosphere
Space Weather, 2023 The Republic of China Satellite‐1 orbiting at 600 km topside ionosphere has observed the topside ionospheric plasma flow pulsations induced by the substorm onsets.
S.‐Y. Su +4 more
doaj +1 more source