| Full text | |
| Author(s): |
Lopez, Fernando M.
[1, 2]
;
Gimenez de Castro, Carlos Guillermo
[1, 3]
;
Mandrini, Cristina H.
[3]
;
Simoes, Paulo J. A.
[4, 1]
;
Cristiani, German D.
[5, 3]
;
Gary, Dale E.
[6]
;
Francile, Carlos
[2, 7]
;
Demoulin, Pascal
[8, 9]
Total Authors: 8
|
| Affiliation: | [1] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Escola Engn, Predio 45 T, R Consolacao, 896-7o Andar Consolacao, Sao Paulo - Brazil
[2] Univ Nacl San Juan, Fac Ciencias Exactas Fis & Nat, Ave Jose Ignacio de la Roza Oeste 590, J5402DCS, San Juan - Argentina
[3] CONICET UBA, Inst Astron & Fis Espacio, Ciudad Univ, Buenos Aires, DF - Argentina
[4] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark - Scotland
[5] Univ Buenos Aires, Fac Ciencias Exactas & Nat, RA-1428 Buenos Aires, DF - Argentina
[6] New Jersey Inst Technol, Ctr Solar Terr Res, Newark, NJ 07102 - USA
[7] Univ Nacl San Juan UNSJ, Observ Astron Felix Aguilar OAFA, J5413FHL, San Juan - Argentina
[8] Univ Paris, LESIA, Observ Paris, Univ PSL, CNRS, Sorbonne Univ, 5 Pl Jules Janssen, F-92195 Meudon - France
[9] Lab Cogitamus, F-75005 Paris - France
Total Affiliations: 9
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 657, JAN 7 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
Context. The mid-infrared (mid-IR) range has been mostly unexplored for the investigation of solar flares. It is only recently that new mid-IR flare observations have begun opening a new window into the response and evolution of the solar chromosphere. These new observations have been mostly performed by the AR30T and BR30T telescopes that are operating in Argentina and Brazil, respectively. Aims. We present the analysis of SOL2019-05-15T19:24, a GOES class C2.0 solar flare observed at 30 THz (10x2006;mu m) by the ground-based telescope AR30T. Our aim is to characterize the evolution of the flaring atmosphere and the energy transport mechanism in the context of mid-IR emission. Methods. We performed a multi-wavelength analysis of the event by complementing the mid-IR data with diverse ground- and space-based data from the Solar Dynamics Observatory (SDO), the H-alpha Solar Telescope for Argentina, and the Expanded Owens Valley Solar Array (EOVSA). Our study includes the analysis of the magnetic field evolution of the flaring region and of the development of the flare. Results. The mid-IR images from AR30T show two bright and compact flare sources that are spatially associated with the flare kernels observed in ultraviolet (UV) by SDO. We confirm that the temporal association between mid-IR and UV fluxes previously reported for strong flares is also observed for this small flare. The EOVSA microwave data revealed flare spectra consistent with thermal free-free emission, which lead us to dismiss the existence of a significant number of non-thermal electrons. We thus consider thermal conduction as the primary mechanism responsible for energy transport. Our estimates for the thermal conduction energy and total radiated energy fall within the same order of magnitude, reinforcing our conclusions. (AU) | |
| FAPESP's process: | 13/24155-3 - Solar flare diagnostic in an unprecedented frequency range from microwaves to THz frequencies: challenges for interpretation (flat) |
| Grantee: | Carlos Guillermo Giménez de Castro |
| Support Opportunities: | Research Projects - Thematic Grants |