ANOMALOUS ENHANCEMENT IN DAYTIME 40-KHZ SIGNAL AMPLITUDE ACCOMPANIED BY GEOMAGNETIC STORMS, EARTHQUAKES AND METEOR-SHOWERS

Authors
DE BK SARKAR SK
Citation
Bk. De et Sk. Sarkar, ANOMALOUS ENHANCEMENT IN DAYTIME 40-KHZ SIGNAL AMPLITUDE ACCOMPANIED BY GEOMAGNETIC STORMS, EARTHQUAKES AND METEOR-SHOWERS, Annales geophysicae, 13(10), 1995, pp. 1117-1123
Citations number
36
Categorie Soggetti
Astronomy & Astrophysics","Geosciences, Interdisciplinary","Metereology & Atmospheric Sciences
Journal title
Annales geophysicae → ACNP
ISSN journal
09927689
Volume
13
Issue
10
Year of publication
1995
Pages
1117 - 1123
Database
ISI
SICI code
0992-7689(1995)13:10<1117:AEID4S>2.0.ZU;2-O
Abstract
Anomalous propagational characteristics, daytime signal levels greater than night-time, were observed. The amplitude records of a 40-kHz sig nal propagated over a distance of 5100 km from Sanwa, Japan to Calcutt a along a low-latitude path show higher signal strength at midday comp ared to the midnight level on days preceded by principal geomagnetic s torms, 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.