Associations between tropospheric gravity waves and enhanced geomagnetic activity over three sunspot-minimum periods

Bowman, G. G. (2000) Associations between tropospheric gravity waves and enhanced geomagnetic activity over three sunspot-minimum periods. Indian Journal of Radio and Space Physics, 29 1: 1-8.

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Author Bowman, G. G.
Title Associations between tropospheric gravity waves and enhanced geomagnetic activity over three sunspot-minimum periods
Journal name Indian Journal of Radio and Space Physics   Check publisher's open access policy
ISSN 0367-8393
0975-105X
Publication date 2000-02-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 29
Issue 1
Start page 1
End page 8
Total pages 8
Place of publication New Delhi, India
Publisher National Institute of Science Communication and Information Resources
Language eng
Subject C3
249999 Physical Sciences not elsewhere classified
780102 Physical sciences
Formatted abstract
Using a microbarograph at Brisbane, Australia, ground-level atmospheric gravity waves (GL-AGWs) have been detected during three sunspot-minimum (Rz-min) periods (1971-1977; 1983-1987 and 1992-1997). Analyses have produced results similar to those found earlier for the Rz-min period 1963-1966. Some of the GL-AGWs (around 25%), which occur one-or two days before cold-front passages at Brisbane, are recorded statistically on the same day, as the low-pressure centres responsible for these fronts pass the Brisbane longitudinal meridian. As before (for 1963-1966), delays by several days after enhanced activity are found using (i) the geomagnetic H component for the periods 1971-1977 and 1983-1987 and (ii) the Kp sum for the other period (1992-1997) for which H-component data were unavailable. Also, AU-indices were used for the 1983-87 period. During 22 years embraced by the four periods there were 619 frontal passages at Brisbane, 40% of which were associated with GL-AGWs. If, similar to auroral-zone events, D-region absorption spike events occur in sub-auroral regions, it is suggested that burst precipitation events of this kind may be responsible for the generation of GL-AGWs.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 23:13:02 EST