Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum

Details Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104..429j&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A1, p. 429-436

Physics

23

Magnetospheric Physics: Ring Current, Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetosphere-Inner

Scientific paper

We use our kinetic drift-loss model to study ring current dynamics during moderate geomagnetic activity at the minimum phase of the current solar cycle, on March 20-22, 1996. Interplanetary conditions monitored by Wind during this period show fluctuations about zero in the (GSM) Bz component, which are due to Alfvén waves in a stream-stream interaction region. The corresponding Dst index shows general activity punctuated by 2 moderate storms (minDst~-50nT and ~-70 nT, respectively) of ~15 hours duration each. We calculate the off-equatorial ring current proton spectra in the energy range 100 eV to 300 keV and compare them with measurements provided by the HYDRA, TIMAS, and CEPPAD instruments on the Polar spacecraft at MLT~2 and MLT~14. We find reasonable overall agreement. An eastward offset of 3 hours in the Kp-dependent Volland-Stern convection electric field with γ=2 is necessary in order to match modeled with observed dips in the energy spectra. Collisional losses have larger effect on the postnoon spectra and reduce significantly the low-energy proton distribution at low L shells and at higher magnetic latitudes. These losses reach maximum values for slowly drifting (~2-10 keV) particles. Our study suggests that a more realistic magnetospheric electric field and additional diffusion processes should be considered to reduce the overestimated width and depth of the dip in the modeled dayside spectra.

Affiliated with

Also associated with

No associations

Rating

Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum 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 Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulation of off-equatorial ring current ion spectra measured by Polar for a moderate storm at solar minimum will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1611096