ULF magnetospheric activity associated with shocks: a comparison of the characteristics and frequencies of wave modes detected in the solar wind and at geosynchronous orbit

Abstract:

The interaction between interplanetary shocks and the magnetosphere is known to excite ULF wave activity in the dayside magnetosphere. A case event analyzed by Villante et al. (2015) showed a one to one correspondence of frequencies detected in the solar wind and in the interplanetary magnetic field in the high speed stream following the shock and in the magnetic field data both at geosynchronous orbit and at ground after the SI manifestation. Here we present the results obtained for 28 events comparing solar wind and magnetospheric observations. We pay particular attention to the correspondence between external and internal frequencies and on the possible asymmetric morning/afternoon manifestation of the discrete frequency modes in the magnetosphere.