Lower ionosphere effect observed during the 30 June 1992 total solar eclipse

Details Lower ionosphere effect observed during the 30 June 1992 total solar eclipse Lower ionosphere effect observed during the 30 June 1992 total solar eclipse

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57...13d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 1, p. 13-17

Physics

3

Argentina, Brazil, Earth Ionosphere, Frequency Response, Ionospheric Propagation, Phase Shift, Radio Waves, Solar Eclipses, Very Low Frequencies, Ionospheric Disturbances, Southern Hemisphere, Sunrise

Scientific paper

VLF radio signals (12.9 kHz) transmitted from Omega-Argentina (43 deg 12 minutes S, 65 deg 24 minutes W) were received in Atibaia, Brazil (23 deg 11 minutes S, 46 deg 33 minutes W) during the total solar eclipse of 30 June 1992. The surface path of the totality crossed the VLF propagation path in the sunrise transition period causing a phase delay of 6.4 microsecond and an amplitude change of 1.3 dB. The ionospheric response to the Sun's obscuration was compared with the phase delays reported for several solar eclipses that occurred from 1966 to 1979. The results are mainly discussed in terms of the length of VLF propagation path affected. Some similarities between a sudden phase anomaly and a reversed eclipse effect are also raised.

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