The ionospheric trough dynamics in the northern and southern hemispheres: the longitudinal and IMF effect

Афонин, В. В.; Ben'kova, N. P.; Besprozvannaya, A. S.; Shchuka, T. I.; Zikrach, E. K.; Shestakova, L. V.

doi:10.1016/0021-9169(95)96865-t

Cited by 7 publications

(8 citation statements)

References 9 publications

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“…More recently, the importance of longitude variations in the trough position has been emphasized (e.g. Deminov et al, 1992;Besprozvannaya et al, 1993;Karpachev et al, 1994Karpachev et al, , 1995Afonin et al, 1995). In fact, initial investigations claimed the amplitude of these changes to be of the order of 10 to 11 degrees (Deminov and Karpachev, 1986a).…”

Section: Longitudinal Variationmentioning

confidence: 99%

The equatorward wall of the subauroral trough in the afternoon/evening sector

Prölss

2007

Ann. Geophys.

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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 variations are only of secondary importance. A formula is derived which summarizes these variations. The magnitude of the density drop in the trough wall depends primarily on altitude and longitude, and to a lesser degree on local time and geomagnetic activity. These variations are also described quantitatively. Using a superposed epoch type of averaging procedure, a mean latitudinal profile of the trough wall is derived. No anomalous increase in the density at the equatorward edge of the trough is observed. There is, however, a significant increase in the electron temperature at the location of the density drop. Our results are important for the empirical description and numerical simulation of ionospheric troughs. They also may be used to define the boundary between middle and subauroral latitudes.

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Section: Longitudinal Variationmentioning

confidence: 99%

The equatorward wall of the subauroral trough in the afternoon/evening sector

Prölss

2007

Ann. Geophys.

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“…The discrepancy between geographic and geomagnetic coordinate systems leads to the longitudinal dependence in the high-latitude ionosphere structure (Afonin et al, 1995;Deminov and Karpachev, 1986a, b;Prh olss, 2007). Longitudinal variations in the trough morphology have also been identified by ionosonde measurements (Whalen, 1987).…”

Section: Introductionmentioning

confidence: 96%

The main ionospheric trough in the East Asian region: Observation and modeling

Pirog

Полех

Романова

et al. 2009

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Since first identified by a topside sounder (Muldrew, 1965), the trough has been extensively studied for several decades via different instruments and techniques. For example, the trough signature can be captured by in situ plasma measurements from low-Earth orbit satellites, such as the Dynamics Explorer-2 satellite (Rodger et al, 1986;Werner & Prölss, 1997;Prölss, 2007), Cosmos-900 and Intercosmos-19 satellites (Deminov & Karpachev, 1986;Afonin et al, 1995;Karpachev et al, 1996Karpachev et al, , 1998Karpachev, 2003), Defense Meteorological Satellite Program (DMSP) (Horvath & Lovell, 2009a, 2009b, 2010Yang et al, 2016Yang et al, , 2018, and CHAMP satellite (Karpachev et al, 2019;Karpachev, 2019aKarpachev, , 2019b.…”

Section: Introductionmentioning

confidence: 99%