Gadanki radar observations ofFregion field-aligned irregularities during June solstice of solar minimum: First results and preliminary analysis

2009 ◽  
Vol 114 (A12) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. K. Patra ◽  
D. V. Phanikumar ◽  
T. K. Pant
Keyword(s):  
Preliminary Analysis ◽  
Solar Minimum ◽  
Radar Observations ◽  
June Solstice ◽  
First Results ◽  
Field Aligned Irregularities

scholarly journals Simultaneous VHF radar backscatter and ionosonde observations of low-latitude E region

2005 ◽  
Vol 23 (3) ◽  
pp. 773-779 ◽  
Author(s):  
A. K. Patra ◽  
S. Sripathi ◽  
P. B. Rao ◽  
K. S. V. Subbarao
Keyword(s):  
Low Latitude ◽  
Vhf Radar ◽  
Radar Echoes ◽  
First Results ◽  
E Region ◽  
Gradient Drift ◽  
Drift Instability ◽  
Relationship Of ◽  
The Relationship ◽  
Field Aligned Irregularities

Abstract. The first results of simultaneous observations made on the low-latitude field-aligned irregularities (FAI) using the MST radar located at Gadanki (13.5° N, 79.2° E, dip 12.5°) and the Es parameters using an ionosonde at a nearby station Sriharikota (13.7° N, 80.1° E, dip 12.6°) are presented. The observations show that while the height of the most intense radar echoes is below the virtual height of Es (h'Es) during daytime, it is found to be either below or above during nighttime. The strength of the FAI is better correlated with the top penetration frequency (ftEs) and the blanketing frequency (fbEs) during the night (r=0.4 in both cases) as compared to the day (r=0.35 and -0.04, respectively). Furthermore, the signal strength of FAI is reasonably correlated with (ftEs-fbEs) during daytime (r=0.59) while very poorly correlated during nighttime (r=0.18). While the radar observations in general appear to have characteristics close to that of mid-latitudes, the relationship of these with the Es parameters are poorer than that of mid-latitudes. The observations reported here, nevertheless, are quite consistent with the expectations based on the gradient drift instability mechanism.

Spread F occurrence over a southern anomaly crest location in Brazil during June solstice of solar minimum activity

2011 ◽  
Vol 116 (A6) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. M. N. Candido ◽  
I. S. Batista ◽  
F. Becker-Guedes ◽  
M. A. Abdu ◽  
J. H. A. Sobral ◽  
...  
Keyword(s):  
Solar Minimum ◽  
June Solstice ◽  
Spread F

HF radar observations of decaying artificial field-aligned irregularities

1996 ◽  
Vol 101 (A12) ◽  
pp. 26981-26993 ◽  
Author(s):  
D. L. Hysell ◽  
M. C. Kelley ◽  
Y. M. Yampolski ◽  
V. S. Beley ◽  
A. V. Koloskov ◽  
...  
Keyword(s):  
Hf Radar ◽  
Radar Observations ◽  
Field Aligned Irregularities

scholarly journals Coherent MIMO to Improve Aperture Synthesis Radar Imaging of Field-Aligned Irregularities: First Results at Jicamarca

2018 ◽  
Vol 56 (5) ◽  
pp. 2980-2990 ◽  
Author(s):  
Juan M. Urco ◽  
Jorge L. Chau ◽  
Marco A. Milla ◽  
Juha P. Vierinen ◽  
Tobias Weber
Keyword(s):  
Radar Imaging ◽  
Aperture Synthesis ◽  
First Results ◽  
Field Aligned Irregularities

scholarly journals Solar Radar Observations

1980 ◽  
Vol 91 ◽  
pp. 135-138
Author(s):  
A. O. Benz
Keyword(s):  
Specular Reflection ◽  
Beat Frequency ◽  
Langmuir Wave ◽  
Wave Interaction ◽  
Corner Reflector ◽  
The Sun ◽  
Langmuir Waves ◽  
Radar Observations ◽  
Upper Limit ◽  
First Results

Radar observations of the sun have been made extensively at decameter and low meter wavelengths (Eshleman et al., 1960, and James, 1966). Their interpretation by specular reflection on high density structures with “corner reflector” shape is unlikely from the echo spectral broadening and range depth. Gordon's (1973) interpretation of the scattering by a 4 wave interaction between radar and coronal Langmuir waves requires a level of 10−2nKT (thermal energy density) of the Langmuir waves. A radar experiment in microwaves with the 300 m dish in Arecibo*) is described, which was able to test this hypothesis. It was based on the idea of scattering radar waves on Langmuir waves by the much more efficient 3 wave interaction. The echo at the beat frequency of the radar (2380 MHz) and the Langmuir wave (170 −270 MHz) is then to be expected at 2600 MHz. The results, however, show the absence of echos, from which an upper limit of 6.10−4nKT for the level of Langmuir waves is derived. First results will soon be published (Benz and Fitze, 1979).

First VHF radar observations of tropical latitude E-region field aligned irregularities

1996 ◽  
Vol 23 (25) ◽  
pp. 3683-3686 ◽  
Author(s):  
R. K. Choudhary ◽  
K. K. Mahajan ◽  
Sachchidanand Singh ◽  
Keshav Kumar ◽  
V. K. Anandan
Keyword(s):  
Vhf Radar ◽  
Radar Observations ◽  
Tropical Latitude ◽  
E Region ◽  
Field Aligned Irregularities
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