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
contributor.author Stoneback, Russell A.
contributor.author Heelis, Roderick A.
contributor.ISNI 0000 0000 3175 0999 (Heelis, RA)
contributor.LCNA 88021080‏ (Heelis, RA)
description.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.
description.sponsorship NASA grant NNX10AT02G
identifier.issn 0992-7689
identifier.uri http://hdl.handle.net/10735.1/4171
identifier.bibliographicCitation Stoneback, R. A., and R. A. Heelis. 2014. "Identifying equatorial ionospheric irregularities using in situ ion drifts." Annales Geophysicae 32(4), doi:10.5194/angeo-32-421-2014
identifier.volume 32
identifier.issue 4
identifier.startpage 421
subject Solar activity
subject Ion drift
subject Wavelets
subject Ionosphere
date.created 2014-04-15
date.issued 2014-04-15
publisher Copernicus Gesellschaft Mbh
relation.uri http://dx.doi.org/10.5194/angeo-32-421-2014
rights CC BY 3.0 (Attribution)
rights ©2014 The Authors
rights.uri http://creativecommons.org/licenses/by/3.0/
language.iso en
source Annales Geophysicae

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CC BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 3.0 (Attribution)