Substorm onset location and the Harang discontinuity

Details Substorm onset location and the Harang discontinuity Substorm onset location and the Harang discontinuity

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51b1403s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51B-1403

Other

2721 Field-Aligned Currents And Current Systems (2409), 2744 Magnetotail, 2760 Plasma Convection (2463), 2790 Substorms, 7894 Instruments And Techniques

Scientific paper

In this study we investigate the relation of auroral substorm onset to the Harang discontinuity. With a database of over 4300 onsets determined from auroral images we will statistically examine the magnetic latitude and MLT location of the onset with respect to the location of the Harang discontinuity as determined with data from the IMAGE magnetometer network. We define the location of the Harang discontinuity as the transition from eastward to westward equivalent ionospheric currents [Amm, 1997; 1998] at the latitude of the main auroral electrojet flow. This work addresses the question of how frequently substorm onset occurs within the ionospheric Harang discontinuity as proposed by Lyons et al. [2003]. Our initial results show that for more than 75 events that occurred within the IMAGE ground magnetometer array about 56% occurred within 6 degrees of latitude of the Harang discontinuity. Another 25% of the Frey et al. onsets occur within ±15 min of a Harang discontinuity. One of the 75 onsets appears to have no HD associated with the onset and the remaining (17%) are most likely misidentified substorms or the viewing angle of the substorm is problematic. We also examine an event that has simultaneous STARE radar data, equivalent ionospheric currents, and a substorm onset. This event shows that the substorm onset occurs between the Harang discontinuity identified in the radar data and the Harang discontinuity identified with the equivalent ionospheric currents.

Affiliated with

Also associated with

No associations

Rating

Substorm onset location and the Harang discontinuity 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 Substorm onset location and the Harang discontinuity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Substorm onset location and the Harang discontinuity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1237712