Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..257..555t&link_type=abstract
Universal Heliophysical Processes, Proceedings of the International Astronomical Union, IAU Symposium, Volume 257, p. 555-561
Astronomy and Astrophysics
Astronomy
Sun: Magnetohydrodynamics, Waves, Atmosphere, Magnetic Fields, Corona
Scientific paper
The propagation of Alfvén waves from the photosphere into the corona with regard to the fine structure of the magnetic field is considered. The energy flux of Alfvén-type waves generated in the photosphere by convective motions does not depend on the ionization ratio. The reflection coefficient continuously decreases with a decrease of wave period. Influence of the external magnetic field on the Spruit cutoff frequency for transverse (kink) modes excited in the thin magnetic flux tubes is analyzed. Torsional modes can penetrate into the upper atmosphere most effectively since their amplitudes does not increase with height in the photosphere while kink ones can be transformed into shock waves in the lower chromosphere because of a significant increase of amplitudes. In spite of stratification the linearity of Alfvén-type modes in the chromosphere is conserved due to violation of the WKB approximation. The important role of the magnetic canopy is discussed. Alfvén waves generated by convective motions in the photosphere can contribute significantly to the heating of the coronal plasma in quite regions of the Sun.
Kopylova Yulia G.
Stepanov Alexander V.
Tsap Yuri T.
No associations
LandOfFree
Generation and propagation of Alfvén waves in solar atmosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Generation and propagation of Alfvén waves in solar atmosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generation and propagation of Alfvén waves in solar atmosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-978568