2007
DOI: 10.5194/angeo-25-645-2007
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The equatorward wall of the subauroral trough in the afternoon/evening sector

Abstract: Abstract. Although ionospheric troughs are a very important feature of the subauroral ionosphere, many of their properties remain incompletely documented and understood. Here Dynamics Explorer-2 satellite data are used to investigate one specific part of this complex phenomenon, namely its equatorward wall. We find that in the afternoon/evening sector of the Northern Hemisphere the location of this density drop depends primarily on the level of geomagnetic activity and magnetic local time. Longitudinal variati… Show more

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Cited by 34 publications
(68 citation statements)
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References 52 publications
(62 reference statements)
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“…A depleted region of the F2 layer ionization in the afternoon/evening sector has been observed for many years (Lockwood, 1980;Benkova et al, 1980;Besprozvannaya et al, 1986;Evans et al, 1983b;Holt et al, 1984;Whalen, 1987Whalen, , 1989Vo and Foster, 2001;Prh olss et al, 1991;Prh olss, 2007). In these papers, this region is termed daytime, midday, mid-latitude, and subauroral troughs.…”
Section: Introductionmentioning
confidence: 89%
“…A depleted region of the F2 layer ionization in the afternoon/evening sector has been observed for many years (Lockwood, 1980;Benkova et al, 1980;Besprozvannaya et al, 1986;Evans et al, 1983b;Holt et al, 1984;Whalen, 1987Whalen, , 1989Vo and Foster, 2001;Prh olss et al, 1991;Prh olss, 2007). In these papers, this region is termed daytime, midday, mid-latitude, and subauroral troughs.…”
Section: Introductionmentioning
confidence: 89%
“…1 and 6). The trough depth depends on MLT (Prölss, 2007, his figure 8), but as he has shown this dependence is not very pronounced. So the main reason for the difference should be related to E Â B drifts.…”
Section: Discussionmentioning
confidence: 84%
“…The fall of the foF2 was more expressed on 25 September in the second recovery phase. It is similar to the sudden density drop on the equatorward wall of the subauroral trough (Prö lss, 2007). At night the foF2 did not stand out above 2 MHz and sometimes the reflections in F2 layer absented because of the low level of ionization.…”
Section: Equinox 2006-2007mentioning
confidence: 74%