HR: 0830h
AN: U31B-0011    [PDF]
TI: Geomagnetic Storm Induced Infrasonic Waves at Low Latitude
AU: * Lal, M
EM: mlal@iig.iigm.res.in
AF: Indian Institute of Geomagnetism, Equatorial Geophysical Research Laboratory, Krishnapuram, Maharajanagar, Tirunelveli, 627011 India
AB: The continuous measurements of the surface pressure variation at low latitude station, Tirunelveli (8.7{$\deg$}N, 77.8{$\deg$}E), India has provided the opportunity to study the influence of geomagnetic storm on the tropospheric infrasonic waves. The polar ionosphere is the major source of infrasonic waves during severe geomagnetic storms. These waves propagate towards the equatorial latitude and is being deducted by the array of microbarograph. The infrasonic waves produced during severe magnetic storm (viz. 24 March 02, 20 Apr 02, 11 May 02, 23 May 02, 2 Aug 02, 4 Spt 02, 1 Oct 02, and 21 Nov 02) has been studied. The power spectral density obtained during these period shows the pronounced presence of waves of period about 10 seconds. The significant enhancement of microbarom has also been obtained in the present work. This could be due to the magnetic storm induced enhancement of ocean waves. The detailed results will be presented during the workshop.
UR: http://www.iigm.res.in
DE: 0358 Thermosphere--energy deposition
DE: 1704 Atmospheric sciences
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3384 Waves and tides
SC: U
MN: 2003 Fall Meeting