Results 161 to 170 of about 853 (193)

On the day and night reversal in NmF2 North-South asymmetry

Planetary and Space Science, 1969
Abstract A time varying solution of the full continuity equation for electrons in the F2-region is obtained. The effects of production, loss, diffusion and electrodynamic E × B drift are taken into account. In addition, the effects of a transequatorial neutral wind are included.
M.F.K. Abur-Robb, D.W. Windle
openaire   +1 more source

Ionospheric electron content and NmF2 from nighttime OI 135.6 nm intensity

Journal of Geophysical Research, 2011
P K Rajesh, Larry Paxton
exaly   +2 more sources

Comparisons of the variation of the ionospheric TEC with NmF2 over China

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
Comparative studies have been made between the variations of the ionospheric total electron content (TEC) and the variation of the maximum electron density of F2 layer (NmF2) over China, based on observations from 34 GPS/TEC sites and 10 ionosonde stations in 2004.
Rui-Yuan Liu, Ye-Wen Wu, Bei-Chen Zhang
openaire   +1 more source

Comparative studies on ionospheric climatological features of NmF2 among the Arctic and Antarctic stations

Journal of Atmospheric and Solar-Terrestrial Physics, 2014
Abstract Climatological features of the maximum electron density of the ionospheric F2 region (NmF2) are investigated and compared among the Arctic and Antarctic stations using long-term observations from the dynasonde measurements at Tromso, the EISCAT Svalbard Radar (ESR) measurements at Longyearbyen, and the digisonde DPS-4 measurements at ...
Yewen Wu, Beichen Zhang, Lixin Guo
exaly   +2 more sources

Causes of the mid-latitude NmF2 winter anomaly at solar maximum

Journal of Atmospheric and Solar-Terrestrial Physics, 2005
Abstract A detailed numerical study is made of the physical and chemical processes, which determine the electron density and temperature measured by the Millstone Hill radar during the geomagnetically quiet periods of 3 June 1979 and 6 January 1980 at solar maximum. It is shown that inclusion of vibrationally excited N 2 ( v > 0 )
A.V. Pavlov, N.M. Pavlova
openaire   +1 more source

On the nighttime increase of NmF2 at Jicamarca on 2–3 February 1965

Journal of Atmospheric and Terrestrial Physics, 1982
Abstract The conditions of the nighttime increase in NmF 2 at the geomagnetic equator are investigated. It is shown that, in an altitude region above 250 km, after 2100 LT, the increase is due to a downward electromagnetic drift when the compression of the plasma associated with the drift overcomes the chemical loss rate.
openaire   +1 more source

Low latitude features of annual and semiannual periodicities in NmF2 in American and Indian zones

Journal of Atmospheric and Terrestrial Physics, 1977
Abstract The monthly median NmF 2 values during the high sunspot period 1958 from a number of low latitude stations in the American zone are subjected to harmonic analysis. The results are presented as a function of local time and are compared with those obtained earlier from the Indian zone.
J.S Shirke, S.S Degaonkar
openaire   +2 more sources

Variations in statistical parameters of the NmF2 winter anomaly with latitude and solar activity

Geomagnetism and Aeronomy, 2012
The maximal R ratios of the winter-to-summer NmF2 values of each ionosonde are calculated for a specified UT under daytime quiet geomagnetic conditions and at approximately equal levels of solar activity, based on foF2 measurement data of 98 ionosondes at mid- and low geomagnetic latitudes of the Northern and Southern hemispheres for 1957–2009. The P(R
A. V. Pavlov, N. M. Pavlova
openaire   +1 more source

Equinoctial asymmetry in mid-latitude NmF2 noontime peaks: A formation mechanism 

Proceedings of the 7th URSI Asia-Pacific RadioScience Conference – AP-RASC 2025
Mid-latitude semiannual noontime NmF2 peaks were analyzed at four Northern Hemisphere stations (Boulder, Rome, Wakkanai, Juliusruh) and two Southern Hemisphere stations (Hobart, Port Stanley). The aeronomic parameters responsible for the observed NmF2 variations were determined by solving an inverse problem of aeronomy using the original THERION method.
Loredana Perrone, Andrey Mikhaylov
openaire   +1 more source

Causes of NmF2 longitudinal variations at mid- and subauroral latitudes under summer nighttime conditions

Geomagnetism and Aeronomy, 2010
The main factors controlling NmF2 longitudinal variations at mid- and subauroral latitudes have been studied. The data of the Intercosmos-19 topside sounding, obtained at high solar activity for summer nighttime conditions, have been used in the analysis.
A. T. Karpachev, N. A. Gasilov, O. A. Karpachev   +2 more
openaire   +1 more source