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Title: Ionospheric Absorption of Radio Waves at Ahmedabad by Al Method
Authors: Kotadia, K.M.
Patel, J.C.
Chhipa, G.M.
Issue Date: Jun-1974
Publisher: NISCAIR-CSIR, India
Abstract: The regular observations of the measurements of absorption of radio waves in the ionosphere by A1 method at Ahmedabad on three different frequencies commenced in April 1972. Results for two months, April and August 1972, are presented for absorption on 1.8 MHz and 2.2 MHz It is found that the absorption on 1.8 MHz reaches a maximum of about 72 dB a little after noon in April and almost at noon in August, and that on 2.2 MHz reaches a maximum of about 61 dB in April and August. The exponent n in the cos χ law of the diurnal variation of absorption on 1.8 MHz is found to be 0.88 in April and 0.97 in August while that for 2.2 MHz, it is 0.94 and 1.35 respectively. It is further noted that there is some indication of reduction in absorption on magnetically disturbed days. The day-to-day variations in absorption are larger at higher frequency, although the absorption on the higher frequency is smaller than on the lower frequency.
Page(s): 158-161
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.03(2) [June 1974]

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