Results 11 to 20 of about 12,217,136 (305)
HF radar observations of equatorial spread-F over West Africa [PDF]
Annales Geophysicae, 1996 New experimental data depicting equatorial spread-F were taken during an HF radar sounding campaign in Korhogo (Ivory Coast, 9°24N, 5°37W, dip 4°S). Range-time-intensity maps of the radar echoes have been analyzed to identify the signatures of density
J.-F. Cécile, P. Vila, E. Blanc
doaj +2 more sources
Global Modeling of Equatorial Spread F with SAMI3/WACCM‐X
Geophysical Research Letters, 2020 We report the first results of a global ionosphere/thermosphere simulation study that self‐consistently generates large‐scale equatorial spread F (ESF) plasma bubbles in the postsunset ionosphere.
J. D. Huba, H.‐L. Liu
doaj +2 more sources
On the Dynamics of Equatorial Spread F [PDF]
Australian Journal of Physics, 1974 A theory is proposed to explain the occurrence of spread F in the equatorial ionosphere. It is envisaged as a multistage process involving: movement of ionization drift with atmospheric gravity waves that results in spatial resonance, consequent ...
Tom Beer
openaire +2 more sources
HF radar observations of equatorial spread-F over West Africa
Annales GeophysicaeNew experimental data depicting equatorial spread-F were taken during an HF radar sounding campaign in Korhogo (Ivory Coast, 9°24N, 5°37W, dip 4°S). Range-time-intensity maps of the radar echoes have been analyzed to identify the signatures of density ...
J.-F. Cécile, P. Vila, E. Blanc
doaj +1 more source
A minimum in the latitude variation of spread-F at March equinox
Progress in Earth and Planetary Science, 2018 This short paper presents the statistics of spread-F occurrence at four low-mid latitude locations (17.0° N, 21.2° N, 26.5° N and 36.5° N mag. lat.) in Japan longitude sector (~ 135° E) in March to April 2002, 2003 and 2006 (high, medium and low solar ...
N. Balan +3 more
doaj +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
Spread F – an old equatorial aeronomy problem finally resolved? [PDF]
Annales Geophysicae, 2009 One of the oldest scientific topics in Equatorial Aeronomy is related to Spread-F. It includes all our efforts to understand the physical mechanisms responsible for the existence of ionospheric F-region irregularities, the spread of the traces in a ...
R. F. Woodman
doaj +1 more source
Overview and summary of the Spread F Experiment (SpreadFEx) [PDF]
Annales Geophysicae, 2009 We provide here an overview of, and a summary of results arising from, an extensive experimental campaign (the Spread F Experiment, or SpreadFEx) performed from September to November 2005, with primary measurements in Brazil.
D. C. Fritts +29 more
doaj +1 more source
Statistical analysis of low-latitude spread F observed over Puer, China, during 2015–2016
Earth, Planets and Space, 2019 Statistical analysis of spread F (SF), recorded at Puer (PUR, 22.7° N, 101.05° E, Dip Latitude 12.9° N) during 2015–2016, was carried out to reveal its characteristics at the northern equatorial ionization anomaly.
Ting Lan +5 more
doaj +1 more source