L-Mapping Solar Energetic Particles from LEO to High Altitudes at High Latitudes
Abstract
The current solar energetic particle (SEP) hazard specification is focused on geosynchronous orbit with some capability at LEO, but there is no specification for the large region between these orbital regimes. The L-mapping technique, which attempts to fill this capability gap, assumes that there is a simple relationship between magnetic L-shells and SEP penetration boundaries that can be exploited. A previous study compared POES observations that had been mapped to the Van Allen Probes with local observations. It found that more than 90% of the mapped and local fluxes were within a factor of four of each other; this is thought to be sucient for operational purposes. One concern with the previous study was the limited number of SEP events that have occurred during the Van Allen Probes mission. The current study examines the L-mapping method's accuracy at higher latitudes. Observations from a satellite that was launched into a HEO orbit with a 63° inclination before the peak of solar cycle 24 are compared to L-mapped POES observations. The larger number of events provides better statistics and the 63° orbit inclination allows us to examine the difference between mapping from POES to the magnetic equator, as in the previous study, and mapping from POES to higher latitudes.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFMSA23A2531Y
- Keywords:
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- 7924 Forecasting;
- SPACE WEATHER;
- 7934 Impacts on technological systems;
- SPACE WEATHER;
- 7959 Models;
- SPACE WEATHER;
- 7974 Solar effects;
- SPACE WEATHER