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| Titel |
Some studies on low-frequency signal in relation to X-ray flares and climatic conditions |
| VerfasserIn |
S. K. Sarkar, B. K. De |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 10/11 ; Nr. 12, no. 10/11, S.1119-1126 |
| Datensatznummer |
250010350
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| Publikation (Nr.) |
 copernicus.org/angeo-12-1119-1994.pdf |
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| Zusammenfassung |
| The statistical behaviour of the sudden
enhancement in signal strength (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°11'N;
139°51'E) in Japan to Calcutta (22°34'N; 88°24'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 dependent 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. |
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