Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338..729d&link_type=abstract
Astronomy and Astrophysics, v.338, p.729-736 (1998)
Astronomy and Astrophysics
Astrophysics
41
Sun: Chromosphere, Sun: Transition Region, Mhd, Waves
Scientific paper
We present an analytical model for the damping of Alfven waves in the partially ionized chromosphere. The damping is due to collisions between ions and neutrals. The ion-neutral collision frequency in this environment is such that the ion and neutral populations are almost perfectly collisionally coupled, leading the Alfven wave to behave as if it acts on the whole plasma (i.e. including neutrals). The small but finite coupling time between ions and neutrals leads to damping of the Alfven waves. We find that this type of damping of upward traveling Alfven waves with frequencies between 0.2 and 0.6 Hz, can cause not only significant heating but also upward motion of the upper chromospheric plasma. In addition the upward force and heating associated with this type of damping can sustain, both dynamically and thermodynamically, an already formed chromospheric spicule. The energy flux carried by the Alfven waves needed for this type of support of a spicule does not seem to be in contradiction with observational and theoretical evidence for the presence of Alfven waves in the chromosphere.
de Pontieu Bart
Haerendel Gerhard
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