Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31b0318n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM31B-0318
Mathematics
Logic
0910 Data Processing, 2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2706 Cusp, 2753 Numerical Modeling
Scientific paper
To better understand the source and behavior of proton aurora, we have studied the precipitating ions using data from the SSJ/4 detectors on the F12 and F14 sun-synchronous orbit satellites of the Defense Meteorological Satellite Program (DMSP). We conducted a study similar to Hardy et al. [1989] by using the data to look at the average global characteristics of precipitating auroral ions. Six months of data were used, from September 2000 to January 2001. For this study we divided the high-latitude region into spatial elements in magnetic local time (MLT) and corrected geomagnetic latitude (CGL). For each of seven levels of magnetic activity as defined by Kp, one such spatial matrix was created containing energy flux and integral number flux. We find the overall energy flux increases with increasing Kp by approximately a factor of two similar to results found in previous studies. The maximum energy flux is found between 2000 and 2300 hours MLT and the minimum peak energy flux is found between 1100 and 1400 hours MLT. The peak energy flux in the premidnight region moves equatorward with increasing Kp values. While Hardy [1989] reports that the peak integral number flux at the cusp has no trend to increase or decrease with increasing Kp, we note that the integral number flux in the polar cap region expands equatorward with increasing Kp. We also find the energy flux in the cusp region becomes apparent at higher Kp levels. These results indicate that the characteristics of precipitating ions have not been completely documented and require further study for a more complete understanding. Hardy, D.A., M.S. Gussenhoven, and D. Brautigam, A Statistical model of auroral ion precipitation, J. Geophys. Res., 94, 370, 1989.
Fillingim Matthew O.
Nguyen Hoi H.
Parks George
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