Letter to the Editor: Post-midnight onset of spread-F at Kodaikanal during the June solstice of solar minimum [PDF]
Annales Geophysicae, 1999 At dip equatorial stations in the Indian zone, spread-F conditions are known to develop preferentially around midnight during the June solstice (northern summer) months of low solar activity, in association with a distinct increase in F layer height ...
J. H. Sastri
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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
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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
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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
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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
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Propagation of gravity waves and spread F in the low-latitude ionosphere over Tucumán, Argentina, by continuous Doppler sounding: first results [PDF]
, 2014 Results of systematic analysis of propagation directions and horizontal velocities of gravity waves (GWs) and spread F structures in low-latitude ionosphere (magnetic inclination ~27°) in Tucumán region, Argentina, are presented.
Baše, J. +12 more
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Low-latitude equinoctial spread-F occurrence at different longitude sectors under low solar activity [PDF]
, 2013 We present the results of a comparative study of spread-F signatures over five low-latitude sites: Chiangmai (CGM; 18.8° N, 98.9° E, mag. Lat. 8.8° N), Thailand; Tanjungsari (TNJ; 6.9° S, 107.6° E, mag. Lat. 16.9° S), Indonesia; Palmas (PAL; 10.2° S, 311.
Abadi, P. +11 more
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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
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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
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Morphology of quantified ionospheric range spread-F over a wide range of midlatitudes in the Australian longitudinal sector [PDF]
Annales Geophysicae, 2007 Ionograms from a standard vertical-incidence ionosonde chain (nine stations), obtained over a wide range of southern latitudes (in geom.lat. range: 23°–52° S), were digitally scanned at 5-min intervals at nighttime (18:00–06:00 LT)
L. A. Hajkowicz
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