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The quiet sun at mm wavelengths as seen by ALMA View all abstracts by submitter

Costas Alissandrakis   Submitted: 2023-01-19 02:41

Solar observations at sub-mm, mm and cm wavelengths offer a straightforward diagnostic of physical conditions in the solar atmosphere because they yield measurement of brightness temperature which, for optically thick features, equals intrinsic temperature - much unlike solar diagnostics in other spectral ranges. The Atacama Large Millimeter and sub-millimeter Array (ALMA) has therefore opened a new, hitherto underexplored, spectral window for studying the enigmatic solar chromosphere. In this review we discuss initial ALMA studies of the quiet chromosphere that used both single-dish and compact-array interferometric observing modes. We present results on the temperature structure of the chromosphere, comparison with classic empirical models of the chromosphere, and observations of the chromospheric network and spicules. Furthermore, we discuss what may be expected in the future, since the ALMA capabilities continuously expand and improve towards higher angular resolution, wavelength coverage, and polarization measurement for magnetometry.

Authors: C. E. Alissandrakis, T.S. Bastian and Roman Brajša
Projects: ALMA

Publication Status: Review, published in Front. Astron. Space Sci.
Last Modified: 2023-01-19 13:10
Go to main E-Print page  Characterising fast-time variations in the hard X-ray time profiles of solar flares using Solar Orbiter's STIX  Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)  Edit Entry  Download Preprint  Delete Entry 

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