Implications of spicule activity on coronal loop heating and catastrophic cooling

Nived, V. N., Scullion, Eamon, Doyle, J. G., Susino, R., Antolin, Patrick, Spadaro, D., Sasso, C., Sahin, Seray and Mathioudakis, M. (2022) Implications of spicule activity on coronal loop heating and catastrophic cooling. Monthly Notices of the Royal Astronomical Society, 509 (4). pp. 5523-5537. ISSN 0035-8711

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We report on the properties of coronal loop foot-point heating with observations at the highest resolution, from the CRisp Imaging Spectro-Polarimeter (CRISP) located at the Swedish 1-m Solar Telescope (SST) and co-aligned NASA Solar Dynamics Observatory (SDO) observations, of Type II spicules in the chromosphere and their signatures in the EUV corona. Here, we address one important issue, as to why there is not always a one-to-one correspondence, between Type II spicules and hot coronal plasma signatures, i.e. beyond TR temperatures. We do not detect any difference in their spectral properties in a quiet Sun region compared to a region dominated by coronal loops. On the other hand, the number density close to the foot-points in the active region is found to be an order of magnitude higher than in the quiet Sun case. A differential emission measure analysis reveals a peak at ∼5 × 105 K on the order of 1022 cm−5 K−1. Using this result as a constraint, we conduct numerical simulations and show that with an energy input of 1.25 × 1024 erg (corresponding to ∼10 RBEs contributing to the burst) we manage to reproduce the observation very closely. However, simulation runs with lower thermal energy input do not reproduce the synthetic AIA 171 Å signatures, indicating that there is a critical number of spicules required in order to account for the AIA 171 Å signatures in the simulation. Furthermore, the higher energy (1.25 × 1024 ergs) simulations reproduce catastrophic cooling with a cycle duration of ∼5 hours, matching a periodicity we observe in the EUV observations.

Item Type: Article
Additional Information: Funding information: P.A. acknowledges support from STFC Ernest Rutherford Fellowship (No. ST/R004285/2). MM acknowledges support from STFC under grant No. ST/P000304/1 & ST/T00021X/1. JGD would like to thank the Leverhulme Trust for a Emeritus Fellowship.
Uncontrolled Keywords: Sun: activity, Sun: chromosphere, Sun: corona, software: simulations, software: data analysis, line: profiles
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 02 Dec 2021 14:19
Last Modified: 11 Jan 2022 13:30

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