Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： After lots of experiments by using 19~27MeV differential energetic proton data based on the observation of SAMPEX from July of 1992 to June of 2004, it is found that the change of F_(10.7) and altitude have a great influence on the distribution of differential energetic proton flux in South Atlantic Anomaly. During the geomagnetic quiet time at 54025km altitude, the energetic proton flux in South Atlantic Anomaly decreased with the increasing of F_(10.7), and the variation trend was flat when F10.7 ≥ 115 sfu. It is found that there was obviously an anti-correlation between the absolute value of SYM-H and the differential energetic proton flux in South Atlantic Anomaly for storms with SYM-H ? -50, and also there was a lasting effect on differential energetic proton flux in South Atlantic Anomaly. In addition, the proton flux could be significantly reduced in South Atlantic Anomaly during the main phase, while the proton flux showed a substantial resuming trend in the recovery phase of geomagnetic storms.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： We use a physics-based global Magnetohydrodynamic (MHD) model to investigate the location and shape of the Earth's bow shock. The bow shock locations in the simulations are identified by an automated search algorithm and is fitted by simple analytical functions. A global three dimensional bow shock model is constructed to include the effect of magnetopause and is parameterized by the fast magnetosonic Mach number, solar wind ram pressure, interplanetary magnetic field strength, and magnetopause curvature radius. The model results are compared and agree well with the previous empirical and simulation models. We also find that both the shock standoff distance and the shock flaring angle decrease monotonically with increasing the fast magnetosonic Mach number. The size and location of bow shock on the equatorial plane and the meridian plane show obvious asymmetry.
Peer Review Status:Awaiting Review
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