Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA

Fabio Reale, David R. Graham, Antonino Petralia, David R. Graham, Fabio Reale, Paola Testa

Risultato della ricerca: Article

1 Citazione (Scopus)

Abstract

The Interface Region Imaging Spectrograph (IRIS) has observed bright spots at the transition region footpoints associated with heating in the overlying loops, as observed by coronal imagers. Some of these brightenings show significant blueshifts in the Si IV line at 1402.77 Å (log T [K] » 4.9). Such blueshifts cannot be reproduced by coronal loop models assuming heating by thermal conduction only, but are consistent with electron beam heating, highlighting for the first time the possible importance of nonthermal electrons in the heating of nonflaring active regions. Here we report on the coronal counterparts of these brightenings observed in the hot channels of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We show that the IRIS bright spots are the footpoints of very hot and transient coronal loops that clearly experience strong magnetic interactions and rearrangements, thus confirming the impulsive nature of the heating and providing important constraints for their physical interpretation.
Lingua originaleEnglish
pagine (da-a)1-12
Numero di pagine12
RivistaTHE ASTROPHYSICAL JOURNAL
Volume882
Stato di pubblicazionePublished - 2019

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spectrographs
heating
coronal loops
electron
helioseismology
observatories
observatory
assembly
electron beams
conduction
electrons
interactions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

Reale, F., Graham, D. R., Petralia, A., Graham, D. R., Reale, F., & Testa, P. (2019). Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA. THE ASTROPHYSICAL JOURNAL, 882, 1-12.

Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA. / Reale, Fabio; Graham, David R.; Petralia, Antonino; Graham, David R.; Reale, Fabio; Testa, Paola.

In: THE ASTROPHYSICAL JOURNAL, Vol. 882, 2019, pag. 1-12.

Risultato della ricerca: Article

Reale, F, Graham, DR, Petralia, A, Graham, DR, Reale, F & Testa, P 2019, 'Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA', THE ASTROPHYSICAL JOURNAL, vol. 882, pagg. 1-12.
Reale, Fabio ; Graham, David R. ; Petralia, Antonino ; Graham, David R. ; Reale, Fabio ; Testa, Paola. / Impulsive Coronal Heating from Large-scale Magnetic Rearrangements: From IRIS to SDO/AIA. In: THE ASTROPHYSICAL JOURNAL. 2019 ; Vol. 882. pagg. 1-12.
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AB - The Interface Region Imaging Spectrograph (IRIS) has observed bright spots at the transition region footpoints associated with heating in the overlying loops, as observed by coronal imagers. Some of these brightenings show significant blueshifts in the Si IV line at 1402.77 Å (log T [K] » 4.9). Such blueshifts cannot be reproduced by coronal loop models assuming heating by thermal conduction only, but are consistent with electron beam heating, highlighting for the first time the possible importance of nonthermal electrons in the heating of nonflaring active regions. Here we report on the coronal counterparts of these brightenings observed in the hot channels of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We show that the IRIS bright spots are the footpoints of very hot and transient coronal loops that clearly experience strong magnetic interactions and rearrangements, thus confirming the impulsive nature of the heating and providing important constraints for their physical interpretation.

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