Characteristics of low latitude ionospheric E-region irregularities linked with daytime VHF scintillations measured from Varanasi |
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Authors: | K Patel A K Singh R P Patel R P Singh |
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Institution: | (1) Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli, India;(2) MF Radar Observatory, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur, India |
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Abstract: | VHF amplitude scintillations recorded during the daytime period from January 1991 to December 1993, April 1998 to December
1999 and January 2008 to December 2008 at low latitude station Varanasi (geographic lat. = 25°15′N; long. = 82°59′E; geomagnetic
lat. = 14°55′N, long. = 154°E, dip angle = 37.3°, sub-ionospheric dip = 34°) have been analyzed to study the behaviour of
ionospheric E-region irregularities during the active solar and magnetic periods. The autocorrelation functions, power spectral
densities, signal de-correlation times are computed to study the temporal features of ionospheric E-region irregularities
linked with daytime scintillations. Derived spectral index ranges between −2 and −9. Assuming velocity of irregularities,
the characteristic lengths of the E-region irregularities are estimated. We have estimated the minimum and maximum range of
scale length of sporadic-E (E
s
) irregularities to be observed over Varanasi. These results are in close agreement with those reported from this latitude
region. |
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Keywords: | |
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