Physics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12.1119s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 10-11, p. 1119-1126
Physics
Atmospherics, Field Strength, Low Frequencies, Relaxation Time, Signal Measurement, Solar Flares, X Rays, Flux Density, H Alpha Line, Humidity, Temperature Distribution, X Ray Spectra
Scientific paper
The statistical behavior of the sudden enhancement in signal strenght (SES) in relation to solar X-ray flares has been studied for the near east-west propagation of 40 kHz radio waves from Sanwa (36 deg 11 min N; 139 deg 51 min E) in Japan to Calcutta (22 deg 34 min N; 88 deg 24 min E) over a long distance path of 5100 km for a period of two years. The period has been divided into four phases - P1, P2, P3 and P4, according to the position of the overhead sun. The change in signal strength during X-ray flares is depdendent on the solar zenith angle and climatic conditions. The statistical modal values of the time lag of the SES peak with respect to that solar X-ray flare is found to increase as solar zenith angle increases. The relative rates of increase and decrease of the signal strength (RRISS and RRDSS respectively) have been evaluated for a number of SES which are related to large X-ray flares. Their characteristics have also been investigated. The modal values of the relaxation time have been found to be highly correlated with climatic conditions like temperature and humidity of the propagation path.
de Barin Kumar
Sarkar Sanat K.
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