Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh13c..11j&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH13C-11
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7522 Helioseismology, 7524 Magnetic Fields
Scientific paper
We show that high-frequency acoustic waves can be used to map the location where the gas and magnetic pressures of the plasma in the solar chromosphere are comparable. This transition region, which can be considered as a "magnetic canopy" where MHD waves can transform from one type into another, is believe to play a key role in the flow of mass and energy through the chromosphere. Results will be presented from the analysis of 18 (uninterrupted) hours of simultaneous, full-disk, velocity observations using the Ni (676 nm), K (770 nm) and Na (589 nm) Fraunhofer lines (with the SOHO/MDI and MOTH/South Pole instruments), and 106 (uninterrupted) hours of K and Na data (from the MOTH/South Pole instrument). The MOTH data were acquired every 10 seconds and the MDI data every 60 seconds. This work was funded by awards OPP-0087541 and OPP-0338251 from the National Science Foundation.
Armstrong James D.
Cacciani Alessandro
Finsterle Wolfgang
Jefferies Stuart M.
McIntosh Scott W.
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