NDLI: Dayside auroras during unusually large positive values of the IMF B $

Content Provider	Springer Nature Link
Author	Vorobjev, V. G. Yagodkina, O. I.
Copyright Year	2009
Abstract	The characteristics of dayside auroras during the large (16–24 nT) positive values of the IMF B $_{ z }$ component, observed on January 14, 1988, during the interaction between the Earth’s magnetosphere and the body of the interplanetary magnetic cloud, have been studied based on the optical observations on Heiss Island. A wide band of diffuse red luminosity with an intensity of 1–2 kilorayleigh (kR) was observed during 6 h in the interval 1030–1630 MLT at latitudes higher than 75° CGL. Rayed auroral arcs, the brightness of which in the 557.7 nm emission sharply increased to 3–7 kR in the postnoon sector immediately after the polarity reversal of the IMF B $_{ y }$ component from positive to negative, were continuously registered within the band. Bright auroral arcs were observed at the equatorward edge of red luminosity. It has been found out that the red auroral intensity increases and the band equatorward boundary shifts to lower latitudes with increasing solar wind dynamic pressure. However, a direct proportional dependence of the variations in the auroral features on the dynamic pressure variations has not been found. It has been concluded that the source of bright discrete auroras is located in the region of the low-latitude boundary layer (LLBL) on closed geomagnetic field lines. The estimated LLBL thickness is ∼3 R $_{ e }$. It has been concluded that the intensity of the dayside red band depends on the solar wind plasma density, whereas the position of the position equatorward boundary depends on the dynamic pressure value and its variations.
Starting Page	703
Ending Page	711
Page Count	9
File Format	PDF
ISSN	00167932
Journal	Geomagnetism and Aeronomy
Volume Number	49
Issue Number	6
e-ISSN	1555645X
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-12-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics Space and Planetary Science

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