EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study

Details EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11205222m&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A5, CiteID A05222

Physics

3

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Substorms

Scientific paper

An interesting open question of magnetospheric physics is the understanding of the dynamics of the magnetotail. The question of the field stretching is even more challenging during substorm periods, mainly because of the short time scales involved during such explosive events. In this study, we asses the ability of global scale proton auroral imaging to provide information on the tail stretching during active periods. We base our investigation on more than 250 isolated substorms observed by IMAGE-SI12 between 2000 and 2002. Applying the algorithm proposed by Donovan et al. (2003) for ground based observations to IMAGE-SI12 data, we determine the Equatorial Limit (EL) of the oval and propose to use it as an indicator of the tail stretching. Simultaneous comparison with GOES-8 allows us to estimate how strong is the relationship between the EL position deduced from SI12 and the magnetic field stretching. The EL indicator is shown to be consistent with previous studies (Sergeev and Gvozdevsky (1995) and Blockx et al. (2005)) and is found to be located in average ~1 degree equatorward of the limit deduced from DMSP measurements. The time evolution of the EL magnetic latitude is also presented for different local times relative to the onset position. This evolution of the EL index presents an asymmetric shape following the time of onset, suggesting a more important stretching of the tail duskward of the onset position. This asymmetric stretching is consistent with GOES-8 in situ measurements.

Affiliated with

Also associated with

No associations

Rating

EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study 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 EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EL - a possible indicator to monitor the magnetic field stretching at global scale during substorm expansive phase: Statistical study will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-770631