SOME STUDIES ON POST-SUNSET MAXIMUM OF A LONG-DISTANCE LF SIGNAL

Authors
DE BK SARKAR SK
Citation
Bk. De et Sk. Sarkar, SOME STUDIES ON POST-SUNSET MAXIMUM OF A LONG-DISTANCE LF SIGNAL, Indian journal of radio & space physics, 24(3), 1995, pp. 126-130
Citations number
NO
Categorie Soggetti
Metereology & Atmospheric Sciences","Astronomy & Astrophysics
Journal title
Indian journal of radio & space physics → ACNP
ISSN journal
03678393
Volume
24
Issue
3
Year of publication
1995
Pages
126 - 130
Database
ISI
SICI code
0367-8393(1995)24:3<126:SSOPMO>2.0.ZU;2-X
Abstract
Disappearance of electrons in the D region of the ionosphere gives ris e to post-sunset maximum (PSM) in the signal amplitude of 40 kHz radio wave propagated over a long distance from Sanwa (Japan) to Calcutta. It has been noticed that there is a time lag between PSM and ionospher ic sunset. This time lag has been studied in relation to the position of the overhead sun. It has been found that in most of the geomagnetic ally active days PSMs are missing due to extra-ionization in the ionos pheric D region.