Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar Minimum

Details Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar Minimum Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar Minimum

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..428..197l&link_type=abstract

SOHO-23: Understanding a Peculiar Solar Minimum ASP Conference Series Vol. 428, proceedings of a workshop held 21-25 September 2

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Scientific paper

We use a SUMER spectrum of a polar coronal hole to measure the ion temperatures Ti of many ions between 0.03 and 0.17 Rsun above the limb. We find that the measured Ti are almost always larger than the electron temperatures (Te) and exhibit a non-monotonic dependence on the charge-to-mass ratio. We use these measurements to provide empirical constraints to a theoretical model of ion heating and acceleration based on gradually replenished ion-cyclotron waves and anisotropic magnetohydrodynamic turbulence. We find that the empirical heating model and the turbulent cascade model agree with one another and with observations for charge-to-mass (Z/A) ratios smaller than about 0.25. Ions with Z/A > 0.25 disagree with the model.

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