Ionogram-recorded equatorial spread-F and height changes at Huancayo during sunspot-maximum years

Bowman, Gordon and Mortimer, Ian K. (2008) Ionogram-recorded equatorial spread-F and height changes at Huancayo during sunspot-maximum years. Journal of Geophysical Research, 113 A1: A01315-1-A01315-11. doi:10.1029/2006JA011881


Author Bowman, Gordon
Mortimer, Ian K.
Title Ionogram-recorded equatorial spread-F and height changes at Huancayo during sunspot-maximum years
Journal name Journal of Geophysical Research   Check publisher's open access policy
ISSN 0148-0227
Publication date 2008-01-26
Sub-type Article (original research)
DOI 10.1029/2006JA011881
Open Access Status Not yet assessed
Volume 113
Issue A1
Start page A01315-1
End page A01315-11
Total pages 11
Editor J. Mutter
P. Taylor
R. Arculus
Place of publication Washington, D.C.
Publisher American Geophysical Union
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
040199 Atmospheric Sciences not elsewhere classified
Abstract The analyses presented here consider equatorial nighttime disturbance conditions as indicated by spread-F traces on ionograms, which record the presence of medium-scale structures (MSSs) created by the passage of atmospheric gravity waves. Relationships between these MSSs and geomagnetic activity (GA) have been examined statistically, particularly considering the ionospheric height (h′F) changes (increases and decreases) associated with the presence or absence of these MSSs. It is shown that for the postsunset height increases with spread-F present, the GA a few hours earlier has well-defined low levels. In contrast, if these height increases are not accompanied by spread-F, the GA a few hours earlier is high. When there are no height rises, similar inverse associations with GA are recorded for both (1) spread-F present and (2) spread-F absent. For the postsunset height decreases, when no spread-F occurs, high GA levels are well defined at times about 7 h earlier. Thus all these results indicate an inverse relationship between the MSSs and GA. The experimental evidence suggests that the presunrise height rises are produced by large-scale traveling ionospheric disturbances generated in auroral-zone regions by substorm onsets.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Mon, 06 Apr 2009, 20:29:54 EST by Jo Hughes on behalf of School of Mathematics & Physics