scholarly journals Postsunset vortex in equatorialF-region plasma drifts and implications for bottomside spread-F

1999 ◽  
Vol 104 (A12) ◽  
pp. 28163-28170 ◽  
Author(s):  
Erhan Kudeki ◽  
Santanu Bhattacharyya
Keyword(s):  
Plasma Drifts ◽  
Spread F ◽  
Region Plasma

scholarly journals Radar and satellite investigations of equatorial evening vertical drifts and spread <i>F</i>

2015 ◽  
Vol 33 (11) ◽  
pp. 1403-1412 ◽  
Author(s):  
J. M. Smith ◽  
F. S. Rodrigues ◽  
E. R. de Paula
Keyword(s):  
Local Time ◽  
Empirical Model ◽  
Sufficient Condition ◽  
Satellite Measurements ◽  
Equatorial Spread F ◽  
Annual Variability ◽  
F Region ◽  
Plasma Drifts ◽  
Spread F ◽  
Coherent Backscatter

Abstract. We analyzed pre-midnight equatorial F region observations made by the 30 MHz coherent backscatter radar of São Luis, Brazil between August 2010 and February 2012. These measurements were processed, and used to create monthly maps of the echo occurrence as a function of local time and height. The maps show the inter-annual variability associated with equatorial spread F (ESF) occurrence in the Brazilian longitude sector. We also constructed monthly curves of the evening vertical drifts, for the Brazilian sector, using measurements by the ion velocity meter (IVM) onboard the C/NOFS satellite. The IVM evening drifts show a good overall agreement with the Scherliess and Fejer (1999) empirical model. Measured and model drifts show the development of the pre-reversal enhancement (PRE) of the vertical plasma drifts during ESF season. Using joint radar and satellite measurements, we found that evening (18:00–18:30 LT) mean non-negative drifts provide a necessary but not sufficient condition for the occurrence of topside ESF echoes. Evening downward (negative) drifts preceded the absence of topside ESF irregularities.

VHF and HF radar measurements of E and F region plasma drifts at the magnetic equator

1992 ◽  
Vol 97 (A3) ◽  
pp. 3011-3017 ◽  
Author(s):  
K. S. Viswanathan ◽  
S. P. Namboothiri ◽  
P. B. Rao
Keyword(s):  
Magnetic Equator ◽  
Hf Radar ◽  
F Region ◽  
Plasma Drifts ◽  
Radar Measurements ◽  
Region Plasma

scholarly journals Average vertical and zonal F region plasma drifts over Jicamarca

1991 ◽  
Vol 96 (A8) ◽  
pp. 13901-13906 ◽  
Author(s):  
B. G. Fejer ◽  
E. R. de Paula ◽  
S. A. González ◽  
R. F. Woodman
Keyword(s):  
F Region ◽  
Plasma Drifts ◽  
Region Plasma

scholarly journals Equinoctial asymmetry of ionospheric vertical plasma drifts and its effect onF-region plasma density

2011 ◽  
Vol 116 (A2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Zhipeng Ren ◽  
Weixing Wan ◽  
Libo Liu ◽  
Yiding Chen ◽  
Huijun Le
Keyword(s):  
Plasma Density ◽  
Plasma Drifts ◽  
Region Plasma

Phenomena during the growth and decay of spread-F

1963 ◽  
Vol 25 (5) ◽  
pp. 445
Author(s):  
M.S.V. Gopala rao ◽  
B. Ramachandra rao
Keyword(s):  
Spread F
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