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  The magnetic drivers of campfires seen by the Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter

Kahil, F., Hirzberger, J., Solanki, S. K., Chitta, L. P., Peter, H., Auchère, F., et al. (2022). The magnetic drivers of campfires seen by the Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter. Astronomy and Astrophysics, 660: A143. doi:10.1051/0004-6361/202142873.

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 Creators:
Kahil, Fatima1, Author              
Hirzberger, Johann1, Author              
Solanki, Sami K.1, Author              
Chitta, L. P.1, Author              
Peter, Hardi1, Author              
Auchère, F., Author
Sinjan, J., Author
Orozco Suárez, D. , Author
Albert, Kinga1, Author              
Albelo Jorge, N. 1, Author
Appourchaux, T., Author
Alvarez-Herrero, A., Author
Blanco Rodríguez, J. , Author
Gandorfer, Achim M.1, Author              
Germerott, Dietmar1, Author              
Guerrero, L.1, Author
Gutierrez-Marques, Pablo2, Author              
Kolleck, Martin1, Author              
Iniesta, J. C. del Toro, Author
Volkmer, R., Author
Woch, Joachim1, Author              Fiethe, B., AuthorGómez Cama, J. M. , AuthorPérez-Grande, I., AuthorSanchis Kilders, E. , AuthorBalaguer Jiménez, M. , AuthorBellot Rubio, L. R. , AuthorCalchetti, D.1, AuthorCarmona, M., AuthorDeutsch, Werner1, Author              Fernández-Rico, Germán1, Author              Fernández-Medina, A., AuthorGarcía Parejo, P. , AuthorGasent-Blesa, J. L., AuthorGizon, Laurent3, Author              Grauf, Bianca1, Author              Heerlein, Klaus1, Author              Lagg, Andreas1, Author              Lange, T., AuthorJiménez, A. López, AuthorMaue, T., AuthorMeller, Reinhard1, Author              Michalik, H., AuthorVacas, A. Moreno, AuthorMüller, R.1, AuthorNakai, E., AuthorSchmidt, W., AuthorSchou, Jesper3, Author              Schühle, Udo1, Author              Staub, Jan1, Author              Strecker, H., AuthorTorralbo, I., AuthorValori, G.1, AuthorAznar Cuadrado, Regina1, Author              Teriaca, Luca1, Author              Berghmans, D., AuthorVerbeeck, C., AuthorKraaikamp, E., AuthorGissot, S., Author more..
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              
3Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: Sun: corona, techniques: polarimetric, Sun: atmosphere, instrumentation: photometers, Sun: magnetic fields, methods: observational, Astrophysics - Solar and Stellar Astrophysics, Physics - Space Physics
 Abstract: Context. The Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft observed small extreme ultraviolet (EUV) bursts, termed campfires, that have been proposed to be brightenings near the apexes of low-lying loops in the quiet-Sun atmosphere. The underlying magnetic processes driving these campfires are not understood. Aims. During the cruise phase of SO and at a distance of 0.523 AU from the Sun, the Polarimetric and Helioseismic Imager on Solar Orbiter (SO/PHI) observed a quiet-Sun region jointly with SO/EUI, offering the possibility to investigate the surface magnetic field dynamics underlying campfires at a spatial resolution of about 380 km. Methods. We used co-spatial and co-temporal data of the quiet-Sun network at disc centre acquired with the High Resolution Imager of SO/EUI at 17.4 nm (HRIEUV, cadence 2 s) and the High Resolution Telescope of SO/PHI at 617.3 nm (HRT, cadence 2.5 min). Campfires that are within the SO/PHI−SO/EUI common field of view were isolated and categorised according to the underlying magnetic activity. Results. In 71% of the 38 isolated events, campfires are confined between bipolar magnetic features, which seem to exhibit signatures of magnetic flux cancellation. The flux cancellation occurs either between the two main footpoints, or between one of the footpoints of the loop housing the campfire and a nearby opposite polarity patch. In one particularly clear-cut case, we detected the emergence of a small-scale magnetic loop in the internetwork followed soon afterwards by a campfire brightening adjacent to the location of the linear polarisation signal in the photosphere, that is to say near where the apex of the emerging loop lays. The rest of the events were observed over small scattered magnetic features, which could not be identified as magnetic footpoints of the campfire hosting loops. Conclusions. The majority of campfires could be driven by magnetic reconnection triggered at the footpoints, similar to the physical processes occurring in the burst-like EUV events discussed in the literature. About a quarter of all analysed campfires, however, are not associated to such magnetic activity in the photosphere, which implies that other heating mechanisms are energising these small-scale EUV brightenings.

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Language(s): eng - English
 Dates: 2022
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/202142873
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 660 Sequence Number: A143 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1