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Title: Effects of solar 10.7 cm radio flux and solar magnetic field on low frequency signal propagation
Authors: De, B K
Sarkar, S K
Issue Date: Jun-1994
Publisher: NISCAIR-CSIR, India
Abstract: Correlations of 40 kHz radio signal propagated over a long distance with the solar microwave radiation, geomagnetic activity and solar magnetic field have been studied. Superposed epoch method of analyses reveals that (i) the day-to-day variations of the midday and midnight LF east-west propagation do not follow the day-to-day variations of the slowly varying component of the 10.7 cm solar flux; however, the year-to-year solar cycle variation of this LF propagation with index of solar activity, i.e. sunspot number is evident, (ii) the amplitude of LF signal does not possess characteristic variation as that of geomagnetic activity, (iii) the LF signal received does not exhibit satisfactory correlation with the positive maximum of the mean solar magnetic field, but (iv) the amplitude of the 40 kHz signal shows a minimum around the negative maximum (dip) of the mean solar magnetic field. The correlation coefficient between the negative solar magnetic field and the 40 kHz signal is found to be as high as 0.89.
Page(s): 213-216
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.23(3) [June 1994]

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