The Data Cross-calibration of Proton Radiation Belt and the Characteristics of its Long-term Variation: NOAA POES and MetOp Satellites
Abstract
The long-term data sets of energetic proton omni-directional integral fluxes with an 8-second resolution from NOAA POES and MetOp satellites from 1978 to 2014 have been investigated comprehensively to capture the bifurcation structures and the calibration inconsistency. The upper and lower branches of bifurcation structures can be clearly separated by the magnetic local time or by the magnetic latitude, and the >16 MeV proton omni-directional integral fluxes among NOAA satellites can be recalibrated well by a third-degree polynomial function. Based on the recalibrated >16 MeV proton fluxes, it is found that: (a) the phase lag times between the trapped proton fluxes and the sunspot number are within 2.5 years and they depend on the solar cycle, L and B/B0; (b) during the period from 1978 to 2014, the maximal (minimal) values of >16 MeV proton fluxes in the low-altitude radiation belt are mainly in 1987 (2002), and the ratios of the maximal to the minimal peak at Lm=1.15 about 10 on the geomagnetic equator and reach up to several tens off the geomagnetic equator. In addition, we also estimate the Ap8 model on the basis of the long-term recalibrated data.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFMSM43B2706L
- Keywords:
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- 2722 Forecasting;
- MAGNETOSPHERIC PHYSICS;
- 2730 Magnetosphere: inner;
- MAGNETOSPHERIC PHYSICS;
- 2753 Numerical modeling;
- MAGNETOSPHERIC PHYSICS;
- 2774 Radiation belts;
- MAGNETOSPHERIC PHYSICS