Coronal Scale-Height Enhancement by Magnetohydrodynamic Waves

Details Coronal Scale-Height Enhancement by Magnetohydrodynamic Waves Coronal Scale-Height Enhancement by Magnetohydrodynamic Waves

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...506l.143l&link_type=abstract

The Astrophysical Journal, Volume 506, Issue 2, pp. L143-L146.

Astronomy and Astrophysics

Astronomy

16

Magnetohydrodynamics: Mhd, Waves, Gravitation, Sun: Corona, Sun: Magnetic Fields

Scientific paper

We discuss the possibility that the transmission of Alfvén waves from the photosphere into coronal loops can increase the density scale height in these loops. The mechanism involved is the ponderomotive force of transmitted waves, which opposes the force of gravity. We propose that this effect may account for cool coronal loops observed by the Solar and Heliospheric Observatory (SOHO). We also suggest that it may be an explanation of the emission measure enhancement found at the top of coronal X-ray loops observed by Yohkoh.

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