scholarly journals The “zebra stripes”: An effect of F region zonal plasma drifts on the longitudinal distribution of radiation belt particles

2016 ◽  
Vol 121 (1) ◽  
pp. 507-518 ◽  
Author(s):  
Solène Lejosne ◽  
Juan G. Roederer
Keyword(s):  
Radiation Belt ◽  
Longitudinal Distribution ◽  
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.

scholarly journals WN4 effect on longitudinal distribution of different ion species in the topside ionosphere at low latitudes by means of DEMETER, DMSP-F13 and DMSP-F15 data

2009 ◽  
Vol 27 (7) ◽  
pp. 2893-2902 ◽  
Author(s):  
L. Bankov ◽  
R. Heelis ◽  
M. Parrot ◽  
J.-J. Berthelier ◽  
P. Marinov ◽  
...  
Keyword(s):  
Density Distribution ◽  
Major Ions ◽  
Local Times ◽  
Longitudinal Distribution ◽  
Topside Ionosphere ◽  
Regular Feature ◽  
Ion Density ◽  
F Region ◽  
Longitudinal Variations ◽  
Ion Species

Abstract. Plasma probe data from DMSP-F13, DMSP-F15 and DEMETER satellites were used to examine longitudinal structures in the topside equatorial ionosphere during fall equinox conditions of 2004 year. Since the launch of DEMETER satellite on 29 June 2004, all these satellites operate close together in the topside ionosphere. Here, data taken from Special Sensor-Ion, Electron and Scintillations (SSIES) instruments on board DMSP-F13, F15 and Instrument Analyser de Plasma (IAP) on DEMETER, are used. Longitudinal variations in the major ions at two altitudes (~730 km for DEMETER and ~840 km for DMSP) are studied to further describe the recently observed "wavenumber-four" (WN4) structures in the equatorial topside ionosphere. Different ion species H+, He+ and O+ have a rather complex longitudinal behavior. It is shown that WN4 is almost a regular feature in O+ the density distribution over all local times covered by these satellites. In the evening local time sector, H+ ions follow the O+ behavior within WN4 structures up to the pre-midnight hours. Near sunrise H+ and later in the daytime, He+ longitudinal variations are out of phase with respect to O+ ions and effectively reduce the effect of WN4 on total ion density distribution at altitudes 730–840 km. It is shown that both a WN4 E×B drift driver and local F-region winds must be considered to explain the observed ion composition variations.

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

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

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
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