Coronal Heating: A Comparison of Ion-Cyclotron and Gravity Damping Models

摘要

SOHO/UVCS data indicate that minor ions in the corona are heated more than hydrogen, and that coronal heating results in T_perpendicular larger than T_(||). Analogous behavior has been known from in situ measurements in solar wind for many years. Here we compare and contrast two mechanisms which have been proposed to account for the above behavior: ion-cyclotron resonance and gravity damping.