Anomalous enhancement in daytime 40-kHz signal amplitude accompanied by geomagnetic storms, earthquakes and meteor showers

Details Anomalous enhancement in daytime 40-kHz signal amplitude accompanied by geomagnetic storms, earthquakes and meteor showers Anomalous enhancement in daytime 40-kHz signal amplitude accompanied by geomagnetic storms, earthquakes and meteor showers

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13.1117d&link_type=abstract

Annales Geophysicae, vol. 13, Issue 10, pp.1117-1123

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Scientific paper

Anomalous propagational characteristics, daytime signal levels greater than night-time, were observed. The amplitude records of a 40-kHz signal propagated over a distance of 5100 km from Sanwa, Japan to Calcutta along a low-latitude path show higher signal strength at midday compared to the midnight level on days preceded by principal geomagnetic storms, earthquakes and major meteor showers. This is explained by the increased ionization in the D-region following geophysical events. The storm after-effects only have a duration of a single day in this low-latitude path. Acknowledgements. We want to express our gratitude to Alain Weill, who manages the SOFIA program, and to all colleagues who contributed to the experiment. We are very grateful to people from the "Institut Géographique National", the "Division Technique de l'Institut National des Sciences de l'Univers (INSU)" and the "Centre d'Aviation Météorologique de Météo-France" who operated the aircraft and processed the data. Frédérique Saïd provided us with very helpful comments on the manuscript. This work was financially supported by the "Programme Atmosphère et Océan à Moyenne Echelle de l'INSU". Topical Editor G. Komen thanks K. B. Katsaros and another referee for their help in evaluating this paper.--> Correspondence to: P. Durand-->

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