The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning

Details The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11601211w&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A1, CiteID A01211

Physics

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Magnetic Storms And Substorms (4305, 7954), Ionosphere: Electric Fields (2712), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Ionosphere: Polar Cap Ionosphere

Scientific paper

Overshielding is referred to a shielding status, during which the dawnward shielding electric field dominates over the duskward penetration electric field in the inner magnetosphere, typically appearing when the interplanetary magnetic field (IMF) suddenly turns northward after a prolonged southward orientation. It is expected that the transition to overshielding after IMF northward turning can be affected by the shape of northward turning (sharp or gradual). Moreover, the initial shielding status (undershielding or goodshielding) prior to the transition may also have influence on the transition. Here we analyze two groups of cases, in which the transitions appear after sharp (duration less than 5 min) and gradual (duration more than 30 min) northward turning. Each group includes two cases, in which the transition initiated from undershielding and goodshielding. These cases show that (1) the beginning of the transition to overshielding coincides with sharp IMF northward turning but appears in the midst of gradual IMF northward turning; (2) the transition from goodshielding to overshielding is always associated with convection electric field drop and/or polar cap shrinkage, regardless of the shape of IMF northward turning; and (3) the typical solar wind condition in which the IMF suddenly turns northward after a prolonged southward orientation is neither a necessary condition nor a sufficient condition for overshielding. Furthermore, we will discuss the effect of substorm processes on overshielding.

Affiliated with

Also associated with

No associations

Rating

The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1598164