Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...727l..32v&link_type=abstract
The Astrophysical Journal Letters, Volume 727, Issue 2, article id. L32 (2011).
Astronomy and Astrophysics
Astronomy
7
Sun: Corona, Sun: Oscillations, Techniques: Spectroscopic
Scientific paper
We use observations of a slow magnetohydrodynamic wave in the corona to determine for the first time the value of the effective adiabatic index, using data from the Extreme-ultraviolet Imaging Spectrometer on board Hinode. We detect oscillations in the electron density, using the CHIANTI atomic database to perform spectroscopy. From the time-dependent wave signals from multiple spectral lines the relationship between relative density and temperature perturbations is determined, which allows in turn to measure the effective adiabatic index to be γeff = 1.10 ± 0.02. This confirms that the thermal conduction along the magnetic field is very efficient in the solar corona. The thermal conduction coefficient is measured from the phase lag between the temperature and density, and is shown to be compatible with Spitzer conductivity.
Del Zanna Giulio
Doorsselaere Tom Van
Jansari Kishan
Nakariakov Valery M.
Verwichte Erwin
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