Predicting the Amplitude of Alfvén Waves in the Coronal Holes

Details Predicting the Amplitude of Alfvén Waves in the Coronal Holes Predicting the Amplitude of Alfvén Waves in the Coronal Holes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh41a1607k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH41A-1607

Physics

Plasma Physics

2164 Solar Wind Plasma, 2169 Solar Wind Sources, 7511 Coronal Holes, 7868 Wave/Wave Interactions, 7974 Solar Effects

Scientific paper

We present a new method for using fluctuations observed by Hinode spacecraft in solar coronal holes as a diagnostic tool for predicting the amplitudes of Alfvén waves. The method is based on a fundamental plasma physics problem concerning driven compressible waves in an inhomogeneous plasma. Alfvén waves propagating in divergent inhomogeneous coronal hole structures are expected to excite driven compressible waves. By analyzing the density fluctuations observed by Hinode, we can obtain information about the ultimate source of those fluctuations, i.e., the Alfvén waves. The obtained characteristics of the Alfvén waves can then be used as inputs to a global solar wind model to produce more accurate estimates of solar wind characteristics at large heliocentric distances, in particular in the near Earth environment.

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