Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh31a1080z&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH31A-1080
Astronomy and Astrophysics
Astrophysics
0639 Nonlinear Electromagnetics, 7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7524 Magnetic Fields, 7827 Kinetic And Mhd Theory
Scientific paper
How does the temperature rise to millions of degrees in the corona from under 6000 K at the photosphere? We investigate the role of magnetohydrodynamic (MHD) waves in heating the solar atmosphere. Evergreen students and faculty work with HAO-NCAR on complementary theoretical calculations and analysis of observational and numerical data. Analysis of UV continuum from the SOHO/SUMER satellite reveals that pressure (p-) modes lose power with altitude. We show how the oscillation frequency spectrum varies with magnetic field strength. Energy flux analysis of 3D MHD data reveals that p-modes excite Alfvenic and magnetosonic waves. These modes can carry energy into the chromosphere, where field line reconnection may drive Joule heating. Analytic solutions of the wave equation in twisted and sheared magnetic field geometries may shed light on mode transformations. Taken together, these analyses may help solve the mystery of anomalous coronal heating.
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