THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS

The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emi...

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Veröffentlicht in:The Astrophysical journal 2012-11, Vol.760 (1), p.1-8
Hauptverfasser: BRYANS, P, PESNELL, W. D
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description The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands.
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subjects ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Atmospherics
ATOMS
COMETS
Earth, ocean, space
ELEMENT ABUNDANCE
Emission
EVOLUTION
Exact sciences and technology
EXTREME ULTRAVIOLET RADIATION
Imaging
IONIZATION
IONS
MOLECULES
PHOTON EMISSION
Radiance
SOLAR ATMOSPHERE
Solar observatories
SOLAR RADIATION
SUN
TELESCOPES
title THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS
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