scholarly journals NUMERICAL SIMULATIONS OF LARGE SCALE EQUATORIAL SPREAD F

1996 ◽  
Vol 45 (11) ◽  
pp. 1930
Author(s):  
HUANG CHAO-SONG ◽  
M.C.KELLEY
Keyword(s):  
Numerical Simulations ◽  
Large Scale ◽  
Equatorial Spread F ◽  
Spread F

Evidence for a large scale electric field gradient at the onset of equatorial spread-F

1984 ◽  
Vol 46 (4) ◽  
pp. 355-362 ◽  
Author(s):  
R Raghavarao ◽  
J.N Desai ◽  
B.G Anandarao ◽  
R Narayanan ◽  
R Sekar ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Large Scale ◽  
Equatorial Spread F ◽  
Spread F

scholarly journals Data-driven numerical simulations of equatorial spread F in the Peruvian sector: 2. Autumnal equinox

2014 ◽  
Vol 119 (8) ◽  
pp. 6981-6993 ◽  
Author(s):  
D. L. Hysell ◽  
M. A. Milla ◽  
L. Condori ◽  
J. W. Meriwether
Keyword(s):  
Numerical Simulations ◽  
Data Driven ◽  
Equatorial Spread F ◽  
Autumnal Equinox ◽  
Spread F

scholarly journals Characterization of VHF radar observations associated with equatorial Spread F by narrow-band optical measurements

2004 ◽  
Vol 22 (9) ◽  
pp. 3129-3136 ◽  
Author(s):  
R. Sekar ◽  
D. Chakrabarty ◽  
R. Narayanan ◽  
S. Sripathi ◽  
A. K. Patra ◽  
...  
Keyword(s):  
Large Scale ◽  
Temporal Variations ◽  
Density Fluctuations ◽  
Optical Measurements ◽  
Small Scale ◽  
Upward Movement ◽  
Vhf Radar ◽  
Equatorial Spread F ◽  
Spread F ◽  
Airglow Intensity

Abstract. The VHF radars have been extensively used to investigate the structures and dynamics of equatorial Spread F (ESF) irregularities. However, unambiguous identification of the nature of the structures in terms of plasma depletion or enhancement requires another technique, as the return echo measured by VHF radar is proportional to the square of the electron density fluctuations. In order to address this issue, co-ordinated radar backscatter and thermospheric airglow intensity measurements were carried out during March 2003 from the MST radar site at Gadanki. Temporal variations of 630.0-nm and 777.4-nm emission intensities reveal small-scale ("micro") and large-scale ("macro") variations during the period of observation. The micro variations are absent on non-ESF nights while the macro variations are present on both ESF and non-ESF nights. In addition to the well-known anti-correlation between the base height of the F-region and the nocturnal variation of thermospheric airglow intensities, the variation of the base height of the F-layer, on occasion, is found to manifest as a bottomside wave-like structure, as seen by VHF radar on an ESF night. The micro variations in the airglow intensities are associated with large-scale irregular plasma structures and found to be in correspondence with the "plume" structures obtained by VHF radar. In addition to the commonly observed depletions with upward movement, the observation unequivocally reveals the presence of plasma enhancements which move downwards. The observation of enhancement in 777.4-nm airglow intensity, which is characterized as plasma enhancement, provides an experimental verification of the earlier prediction based on numerical modeling studies.

scholarly journals Concurrent observations at the magnetic equator of small-scale irregularities and large-scale depletions associated with equatorial spread F

2015 ◽  
Vol 120 (12) ◽  
pp. 10,883-10,896 ◽  
Author(s):  
Dustin A. Hickey ◽  
Carlos R. Martinis ◽  
Fabiano S. Rodrigues ◽  
Roger H. Varney ◽  
Marco A. Milla ◽  
...  
Keyword(s):  
Large Scale ◽  
Magnetic Equator ◽  
Small Scale ◽  
Equatorial Spread F ◽  
Spread F

scholarly journals The Brazil/Guará Equatorial Spread F Campaign: Results of the large scale measurements

1997 ◽  
Vol 24 (13) ◽  
pp. 1691-1694 ◽  
Author(s):  
J. LaBelle ◽  
J.-M. Jahn ◽  
R. F. Pfaff ◽  
W. E. Swartz ◽  
J. H. A. Sobral ◽  
...  
Keyword(s):  
Large Scale ◽  
Equatorial Spread F ◽  
Spread F

scholarly journals Ionogram signatures of large-scale wave structure and their relation to equatorial spread F

2012 ◽  
Vol 117 (A8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Smitha V. Thampi ◽  
Roland T. Tsunoda ◽  
Lijo Jose ◽  
Tarun Kumar Pant
Keyword(s):  
Large Scale ◽  
Wave Structure ◽  
Equatorial Spread F ◽  
Spread F

First observations of large-scale wave structure and equatorial spread F using CERTO radio beacon on the C/NOFS satellite

2009 ◽  
Vol 36 (18) ◽  
Author(s):  
Smitha V. Thampi ◽  
Mamoru Yamamoto ◽  
Roland T. Tsunoda ◽  
Yuichi Otsuka ◽  
Takuya Tsugawa ◽  
...  
Keyword(s):  
Large Scale ◽  
Wave Structure ◽  
Equatorial Spread F ◽  
Spread F ◽  
Radio Beacon
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