Volcanic eruption induced WWVB transmission path interruption

Details Volcanic eruption induced WWVB transmission path interruption Volcanic eruption induced WWVB transmission path interruption

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..685b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, July 1985, p. 685-692.

Physics

1

Ashes, Cloud Cover, Radio Transmission, Transmission Loss, Tropospheric Scattering, Volcanoes, D Region, Interruption, Ionospheric Propagation

Scientific paper

It is reported that the 60 kHz transmission of WWVB from Fort Collins, Colorado, was not received in Calgary, Alberta, Canada, for about 11 h from 1109 UT to 2153 UT on July 23, 1980. It is suggested that this transmission path interruption is correlated with the 15 km height ash cloud due to the July 22, 1980 volcanic eruption of Mount St. Helens as it drifted eastward interrupting both the ground- and first hop sky-wave paths and that this ash cloud is the source of the conductivity and/or ionization necessary to produce this interruption. Small phase retardations are also reported which could be correlated with other Mount St. Helens volcanic events during May-July 1980.

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