A study of L band scintillations during the initial phase of rising solar activity at an Indian low latitude station

2013 ◽  
Vol 52 (3) ◽  
pp. 412-421 ◽  
Author(s):  
H.J. Tanna ◽  
S.P. Karia ◽  
K.N. Pathak
Keyword(s):  
Solar Activity ◽  
Initial Phase ◽  
Low Latitude ◽  
Latitude Station ◽  
L Band

Vertical TEC variations and model during low solar activity at a low latitude station, Xiamen

2012 ◽  
Vol 49 (3) ◽  
pp. 530-538 ◽  
Author(s):  
Guoqi Liu ◽  
Wengeng Huang ◽  
Hua Shen ◽  
Jiancun Gong
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Latitude Station

scholarly journals Characteristics of VHF radiowave scintillations over a solar cycle (1983−1993) at a low-latitude station: Waltair (17.7°N, 83.3°E)

1997 ◽  
Vol 15 (6) ◽  
pp. 729-733 ◽  
Author(s):  
P. V. S. Rama Rao ◽  
P. T. Jayachandran ◽  
P. Sri Ram ◽  
B. V. Ramana Rao ◽  
D. S. V. V. D. Prasad ◽  
...  
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
High Solar Activity ◽  
Night Time ◽  
Low Latitude ◽  
Latitude Station ◽  
Maximum Occurrence

Abstract. The characteristics of VHF radiowave scintillations at 244 MHz (FLEETSAT) during a complete solar cycle (1983–93) at a low-latitude station, Waltair (17.7°N, 83.3°E), are presented. The occurrence of night-time scintillations shows equinoctial maxima and summer minima in all the epochs of solar activity, and follows the solar activity. The daytime scintillation occurrence is negatively correlated with the solar activity and shows maximum occurrence during the summer months in a period of low solar activity. The occurrence of night-time scintillations is inhibited during disturbed days of high solar activity and enhanced during low solar activity.

scholarly journals VHF and L-band scintillation characteristics over an Indian low latitude station, Waltair (17.7° N, 83.3° E)

2005 ◽  
Vol 23 (7) ◽  
pp. 2457-2464 ◽  
Author(s):  
P. V. S. Rama Rao ◽  
S. Tulasi Ram ◽  
K. Niranjan ◽  
D. S. V. V. D Prasad ◽  
S. Gopi Krishna ◽  
...  
Keyword(s):  
Electric Fields ◽  
Spectral Characteristics ◽  
Sunspot Activity ◽  
Plasma Bubble ◽  
Low Latitude ◽  
Latitude Station ◽  
Bottom Side ◽  
L Band ◽  
Electric Fields And Currents ◽  
Fading Rate

Abstract. Characteristics of simultaneous VHF (244 MHz) and L-band (1.5 GHz) scintillations recorded at a low-latitude station, Waltair (17.7° N, 83.3° E), during the low sunspot activity year of March 2004 to March 2005, suggest that the occurrence of scintillations is mainly due to two types, namely the Plasma Bubble Induced (PBI), which maximizes during the post sunset hours of winter and equinoctial months, and the Bottom Side Sinusoidal (BSS) type, which maximizes during the post-midnight hours of the summer solstice months. A detailed study on the spectral characteristics of the scintillations at both the frequencies show that the post-sunset scintillations are strong with fast fading (≈40 fad/min) and are multiple in nature in scattering, giving rise to steep spectral slopes, whereas the post-midnight scintillations, which occur mostly on the VHF signal with low fading rate (≈4 fad/min), are of the BSS type, often showing typical Fresnel oscillations with reduced roll off spectral slopes, indicating that the type of irregularity resembles a thin screen structure giving rise to weak scattering. Using the onset times of several similar scintillation patches across the two satellite (FLEETSAT 73° E, INMARSAT 65° E) ray paths (sub-ionospheric points are separated by 82 km), the East ward movement of the irregularity patches is found to vary from 150 to 250 m/s during the post sunset hours and decrease slowly during the post midnight hours. Further, the east-west extent of the PBI type of irregularities is found to vary from 100 to 500 km, while that of the BSS type extend up to a few thousand kilometers. Keywords. Ionosphere (Ionospheric irregularities; Auroral ionosphere; Electric fields and currents)

F3 layer feature under low and medium solar activity observed at a Chinese low latitude station Fuke

2013 ◽  
Vol 52 (3) ◽  
pp. 383-390 ◽  
Author(s):  
Zhengping Zhu ◽  
Kun Chen ◽  
Jiaping Lan ◽  
Fenglou Sun
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Latitude Station
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