Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31a2090b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31A-2090
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2441] Ionosphere / Ionospheric Storms, [2447] Ionosphere / Modeling And Forecasting, [2475] Ionosphere / Polar Cap Ionosphere
Scientific paper
We studied the effects of a geomagnetic storm on the behavior of the polar wind for different seasonal and solar activity conditions using a generalized polar wind model that extends up to 8 RE, with a fluid-like component at low altitudes and a macroscopic PIC component at high altitudes. The geomagnetic activity was represented by an idealized storm followed by a quiet period of roughly equal time intervals. Four runs were performed for different combinations of summer/winter and solar maximum/minimum in order to elucidate the combined effect of a storm with seasonal and solar activity. Comparing the results for the storm and quiet periods, and for the four cases mentioned above, we concluded the following: (1) During the main phase, the storm effects was shown most prominently as large increases of O+/H+ density ratio, n(O+)/n(H+), O+/H+ flux ratio, F(O+)/F(H+), and in the O+ flux, F(O+). (2) During the storm main phase, the H+ flux is decreased, which is consistent with the "blowout" phenomenon mentioned in previous literature. (3) The O+ flux can reach up to 1010 cm-2 s-1 during the main phase, for the case of summer/solar maximum. (4) For the case of summer/solar maximum, F(O+) is comparable to, or larger than, F(H+) everywhere, while F(O+) is less than F(H+) almost everywhere (except the main phase) for the case of winter/solar minimum. (5) In agreement with observations, O+ flows upwards (V(O+) > 0) everywhere above 5,000 km. (6) At intermediate altitudes (few RE), the O+/H+ drift velocity ratio V(O+)/V(H+) is larger within the polar cap than within the cusp/auroral region due to the contact potential associated with the polar rain. (7) Drift velocities, V(O+) and V(H+) at high altitudes are not sensitive to season or solar activity because they are mainly controlled by the magnetospheric hot electrons and the wave-particle interactions (WPI) which are mostly independent of those conditions. (8) For solar maximum, n(O+) and F(O+) are higher, while n(H+) and F(H+) are lower than for solar minimum. (9) In summer, n(O+) and F(O+) are higher than in winter, while n(H+) and F(H+) are relatively insensitive to seasonal effects.
Barakat Abdallah R.
Schunk Robert W.
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