ULF Waves - Pc5 range - from the solar wind to the ground during high speed solar wind streams

Details ULF Waves - Pc5 range - from the solar wind to the ground during high speed solar wind streams ULF Waves - Pc5 range - from the solar wind to the ground during high speed solar wind streams

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0538k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0538

Other

2149 Mhd Waves And Turbulence, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We show a clear correlation between the power in ULF waves (Pc5 range) inside and outside Earth's magnetospere during high speed streams in 1995. We find that the peak power in high speed streams is in the 0-10 mHz range, particularly below 2 mHz, where the Pc5 range is defined as 1-10 mHz. We trace the waves beginning 200~RE upstream using Wind data to waves just upstream from Earth's bow shock and in the magnetosheath using Geotail data to waves on the ground at the Kilpisjarvi ground station. We compare the total power in the Pc5 frequency from the upstream waves to the total power from Pc5 pulsations at the Kilpisjarvi ground station. We find that the pattern of increases and decreases in ULF wave power at Pc5 frequencies correlates in all regions; between the solar wind and the ground the correlation coefficient is 0.61. The total power in the solar wind is about a factor of 10 less than that on the ground, but the total power increases in the magnetosheath to values comparable to the ground. This suggests that solar wind waves may provide a ready source for the magnetosphere. In agreement with earlier studies we find that the ULF waves in the central region of the high speed streams are Alfvénic and in the compression region at the leading edges have higher amplitudes but are not purely Alfvénic. In contrast to earlier studies we find that the trailing edges are not purely Alfvénic. In the magnetosheath the Alfvén mode is less pure in the central region of streams, and is most likely mixed with other modes due to turbulence.

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