scholarly journals Radar Studies of Height‐Dependent Equatorial F region Vertical and Zonal Plasma Drifts

2019 ◽  
Vol 124 (3) ◽  
pp. 2058-2071 ◽  
Author(s):  
S. A. Shidler ◽  
F. S. Rodrigues ◽  
B. G. Fejer ◽  
M. A. Milla
Keyword(s):  
F Region ◽  
Plasma Drifts

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.

Vertical plasma drifts in the F region at the magnetic equator

1989 ◽  
Vol 94 (A9) ◽  
pp. 12055 ◽  
Author(s):  
S. P. Namboothiri ◽  
N. Balan ◽  
P. B. Rao
Keyword(s):  
Magnetic Equator ◽  
F Region ◽  
Plasma Drifts

Equatorial F region vertical plasma drifts during solar maxima

1989 ◽  
Vol 94 (A9) ◽  
pp. 12049 ◽  
Author(s):  
B. G. Fejer ◽  
E. R. de Paula ◽  
I. S. Batista ◽  
E. Bonelli ◽  
R. F. Woodman
Keyword(s):  
F Region ◽  
Plasma Drifts

HF Doppler observations of vertical plasma drifts in the evening F region at the equator

1987 ◽  
Vol 92 (A10) ◽  
pp. 11253 ◽  
Author(s):  
B. Jayachandran ◽  
N. Balan ◽  
S. P. Nampoothiri ◽  
P. B. Rao
Keyword(s):  
F Region ◽  
Plasma Drifts

Vertical plasma drifts in the post-sunset F-region at the magnetic equator

1988 ◽  
Vol 50 (12) ◽  
pp. 1087-1091 ◽  
Author(s):  
S.P. Namboothiri ◽  
B. Jayachandran ◽  
N. Balan ◽  
P.B. Rao
Keyword(s):  
Magnetic Equator ◽  
F Region ◽  
Plasma Drifts

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
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