Damping of Coronal EIT Waves as a Tool for Plasma Diagnostics

Details Damping of Coronal EIT Waves as a Tool for Plasma Diagnostics Damping of Coronal EIT Waves as a Tool for Plasma Diagnostics

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..433b&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

Computer Science

3

Coronal Seismology, Waves, Observations

Scientific paper

Observations with the Extreme-Ultraviolet Imaging Telescope (EIT) on-board SOHO have revealed the existence of transient coronal waves generated by an impulsive event (e.g. flare or coronal mass ejection) that propagates across the visible solar disk over very long distances. The present work aims to discuss one of the most remarkable properties of waves, namely how to obtain diagnostic information about the medium in which these waves propagate. By extracting information from EIT wave observations (propagation speed, damping length, etc.) we use these waves for plasma diagnostics, i.e. global coronal seismology. Applying a simple coronal model, we find average values of magnetic field at the propagation height of EIT waves, as well as average values for the coefficient of kinematic viscosity. Using TRACE data we show that EIT waves are indeed waves with a well defined period.

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