Identifying Equatorial Ionospheric Irregularities using In Situ Ion Drifts

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Identifying Equatorial Ionospheric Irregularities using In Situ Ion Drifts

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Title: Identifying Equatorial Ionospheric Irregularities using In Situ Ion Drifts
Author(s):
Stoneback, Russell A.;
Heelis, Roderick A.
Item Type: Article
Keywords: Solar activity
Ion drift
Wavelets
Ionosphere
Abstract: Previous climatological investigations of ionospheric irregularity occurrence in the equatorial ionosphere have utilized in situ measurements of plasma density to identify the presence of an irregularity. Here we use the Morlet wavelet and C/NOFS to isolate perturbations in meridional ion drifts and generate irregularity occurrence maps as a function of local time, longitude, season, and solar activity. For the low solar activity levels in 2008, the distributions identified by velocity perturbations follow normalized density perturbation (Delta N/N) maps with large occurrences after midnight into dawn over all longitudes. The velocity and normalized density occurrence maps contract in both local time and longitude with increasing solar activity. By 2011 irregularities are confined to particular longitudes expected by alignment and a few hours of local time after sunset. The variation in the occurrence of the late night irregularities with solar activity is consistent with the presence of gravity wave seeding.
Publisher: Copernicus Gesellschaft Mbh
ISSN: 0992-7689
Persistent Link: http://hdl.handle.net/10735.1/4171
http://dx.doi.org/10.5194/angeo-32-421-2014
Terms of Use: CC-BY 3.0 License
©2014 The Authors
Sponsors: NASA grant NNX10AT02G

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CC-BY 3.0 License Except where otherwise noted, this item's license is described as CC-BY 3.0 License