Spread-F occurrence in mid- and low-latitude regions related to various levels of geomagnetic activity

Bowman G.G. (1982) Spread-F occurrence in mid- and low-latitude regions related to various levels of geomagnetic activity. Journal of Atmospheric and Terrestrial Physics, 44 7: 585-589. doi:10.1016/0021-9169(82)90069-1


Author Bowman G.G.
Title Spread-F occurrence in mid- and low-latitude regions related to various levels of geomagnetic activity
Journal name Journal of Atmospheric and Terrestrial Physics
ISSN 0021-9169
Publication date 1982-01-01
Sub-type Article (original research)
DOI 10.1016/0021-9169(82)90069-1
Volume 44
Issue 7
Start page 585
End page 589
Total pages 5
Subject 1902 Film, Television and Digital Media
1908 Geophysics
Abstract The occurrence of spread-F from seven latitude regions for ionosonde stations (78 in all) located from L-shell = 3.3 to 1.05 has been investigated (using the superposed-epoch technique) relative to four different levels of geomagnetic activity. Data for 14.5 years were used. For moderate, high and very-high geomagnetic activity a significant peak in spread-F occurrence is found for the four latitude regions closest to the auroral zone. These peaks are delayed (after the geomagnetic activity) by a matter of days, the delays being greater for the lower levels of activity and also greater for regions further from the auroral zone. Similarly, delayed dips in spread-F occurrence are found for very-low geomagnetic activity. Analyses for the remaining three regions (those closest to the equator) failed to show corresponding delayed peaks or dips in the occurrence of spread-F relative to the appropriate levels of geomagnetic activity. It is suggested that (for the three highest levels of geomagnetic activity) the mechanism which is responsible for the suppression of spread-F in equatorial regions may operate at these low latitudes and thus counterbalance the other mechanism which is responsible for the positive correlation found for the higher-latitude regions.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 20 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 28 Jun 2016, 16:21:56 EST by System User