Solar wind and geomagnetic activity effects on the radiation belt particle population using over a solar cycle of satellite and riometer data

Details Solar wind and geomagnetic activity effects on the radiation belt particle population using over a solar cycle of satellite and riometer data Solar wind and geomagnetic activity effects on the radiation belt particle population using over a solar cycle of satellite and riometer data

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2075k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2075

Physics

Plasma Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

In this study, we investigate the flux of high- and low-energy particles, as obtained from LANL satellite observations (1989-2008), NOAA observations (1998-2010) and riometer observations (1989-2010), with respect to solar wind and geomagnetic conditions. Data are global daily averages for a period extending over two solar cycles. The spatial coverage provided by satellite observations is quite low and so, in addition to NOAA satellites, we employ absorption data from the NORSTAR riometer array as a measure of particle precipitation over a range of latitudes and local times. We present evidence of a solar cycle and solar wind activity dependence of trapped and precipitating fluxes, and statistically show that riometer absorption responds only to the lower-energy fluxes (~30keV), with the agreement increasing during Co-rotating Interaction Region CIR periods, and associated high solar wind speed. We further analyze the CIR periods through data assimilation of Akebono, LANL and GPS particle data using a 1-D radial diffusion model, to investigate the evolution of the radiation belt system during these highly regular periods. The study contributes to our understanding of the effects of loss and acceleration of electrons over long time periods, and during different solar wind conditions. It also provides a first step towards a new method of remote sensing the radiation belts through the use of ground-based observations. In particular, we show that there is a statistical delay between intensifications in lower energy particles and relativistic electrons in the radiation belts. These observations are consistent with the proposed mechanism of acceleration of MeV electrons by chorus waves, which take free energy from the lower energy particles. The presented climatological data sets will be used in the future to make long-term predictions of the radiation environment.

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