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The Unified Astronomy Thesaurus is an open, interoperable and community-supported thesaurus of astronomical and astrophysical concepts and their relationships.
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New Concept: Solar coronal rain #351

Open patrickantolin opened 2 years ago

patrickantolin commented 2 years ago

Name the new concept Solar coronal rain

Describe the concept Related to concept 'Solar prominences', but now recognised as different. Coronal rain can be thought of as the seed that leads to prominences on the Sun. It is partially ionised material observed in chromospheric or transition region lines occurring in a timescale of minutes, sub-sequently falling along coronal loops. It is far more ubiquitous than prominences and more strongly related to coronal heating due to the specific heating conditions in coronal loops needed for its generation.

Describe where the concept fits within the existing hierarchy More General Concepts: Solar activity More Specific Concepts: Quiescent coronal rain, flare-driven coronal rain, Prominence-coronal rain hybrids Alternate Terms: Coronal rain Related Concepts: Solar prominences, Solar filaments, Long-period intensity pulsations

Provide 1-3 supporting articles Antolin, P. & Rouppe van der Voort 2012, ApJ 745, 152 (DOI: 10.1088/0004-637X/745/2/152) Antolin, P. 2020, PPCF 62, 1 (DOI: 10.1088/1361-6587/ab5406) Antolin, P & Froment, C. 2022, FrASS 9 (DOI: 10.3389/fspas.2022.820116)

Please include any additional comments/feedback

BartlettAstro commented 1 month ago

@ebortey can you find a definition from an authoritative source?

Suggested related concept long-period intensity pulsations is #352. None of the more specific concepts are yet in the UAT.

@katieefrey @danielchivvis are we ready to add at solar coronal rain now or do we wish to wait for further heliophysics input? If we add it, we should open new issues for the missing narrower concepts.

ebortey commented 1 month ago

Here is a definition I found for coronal rain: Coronal rain is “Material that condenses in the Sun's corona and appears to rain down into the chromosphere, as observed at the solar limb above strong sunspots.”

patrickantolin commented 1 month ago

Hello,

The quoted definition is not very correct, since coronal rain does not only appear above strong sunspots. Also, it does not only fall, but also moves up (sporadically). It moves mostly downward as a bulk flow. I would therefore like to suggest the following definition. Based on my recent reviews ( https://doi.org/10.1088/1361-6587/ab5406, https://doi.org/10.3389/fspas.2022.820116):

Coronal rain corresponds to cool (10^4 K — 10^5 K) and dense (10^10 cm^-3 — 10^11 cm^-3), partially ionised plasma in the solar corona, with clumpy and filamentary morphology, and mostly falling along loop-like trajectories into the chromosphere.

Best, Patrick

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Here is a definition I found for coronal rain: Coronal rain is “Material that condenses in the Sun's corona and appears to rain down into the chromosphere, as observed at the solar limb above strong sunspots.”

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