Results 21 to 30 of about 11,557,211 (324)
HF doppler observations on the occurrence of equatorial spread-F
Journal of Earth System Science, 1985 HF doppler observations of the vertical drift velocity and group height of the 5.5 MHz plasma frequency level of the post-sunset bottomside F-region obtained on a fewESF (equatorial spread-F) and non-ESF days at Trivandrum are presented. The results show that on the non-ESF days, the maximum group height attained is about 400 km and the maximum ...
B. T. Vikram Kumar +2 more
openaire +2 more sources
Possible ionospheric preconditioning by shear flow leading to equatorial spread F [PDF]
Annales Geophysicae, 2005 Vertical shear in the zonal plasma drift speed is apparent in incoherent and coherent scatter radar observations of the bottomside F region ionosphere made at Jicamarca from about 1600–2200 LT.
D. L. Hysell, E. Kudeki, J. L. Chau
doaj +2 more sources
Equatorial spread F fossil plumes [PDF]
Annales Geophysicae, 2010 Behaviour of equatorial spread F (ESF) fossil plumes, i.e., ESF plumes that have stopped rising, is examined using the NRL SAMI3/ESF three-dimensional simulation code.
J. Krall +3 more
doaj +1 more source
The Effect of Equatorial Spread F on Relative Orbit Determination of GRACE Using Differenced GPS Observations [PDF]
Journal of Astronomy and Space Sciences, 2009 In this paper, relative orbit of Low Earth Orbit satellites is determined using only GPS measurements and the effects of Equatorial Spread-F (ESF), that is one of biggest ionospheric irregularities, are investigated.
Kyoung-Min Roh +3 more
doaj +1 more source
Earth, Planets and Space, 2023 The occurrence of equatorial spread F (ESF) has the potential to detrimentally impact space-based technological systems. This study investigates the utility of ionosondes in forecasting the incidence of post-sunset ESF in the zonal direction, utilizing ...
P. Abadi +8 more
semanticscholar +1 more source
Seasonal variations of equatorial spread-F [PDF]
Annales Geophysicae, 1994 The occurrence of spread-F at Trivandrum (8.5°N, 77°E, dip 0.5°N) has been investigated on a seasonal basis in sunspot maximum and minimum years in terms of the growth rate of irregularities by the generalized collisional Rayleigh-Taylor (GRT ...
K. S. V. Subbarao, B. V. Krishna Murthy
doaj +1 more source
Earth, Planets and Space, 2023 A new mode for two dimensional observations of F-region irregularities in the magnetic equatorial plane using AMISR-14 is described. Examples of observations are presented and illustrate the ability of the system to capture the genesis, evolution, and ...
F. Rodrigues +7 more
semanticscholar +1 more source
Density enhancements associated with equatorial spread F [PDF]
Annales Geophysicae, 2010 Forces governing the three-dimensional structure of equatorial spread-F (ESF) plumes are examined using the NRL SAMI3/ESF three-dimensional simulation code.
J. Krall +3 more
doaj +1 more source
Magnetic Signatures of Equatorial Spread F as Observed by the CHAMP Satellite
Journal of Geophysical Research: Space Physics, 2006 Georgios Balasis +2 more
exaly +2 more sources
Progress in Earth and Planetary Science, 2018 Typical equatorial spread-F events are often said to occur during post-sunset, equinox conditions in most longitude sectors. Recent studies, however, have found an unexpected high occurrence of ionospheric F-region irregularities during June solstice ...
Fabiano S. Rodrigues +6 more
doaj +1 more source