The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR

Autor(es)

Gimenez de Castro, C. G. ^{[1, 2]} ; Raulin, J-P ^[1] ; Silva, J. F. Valle ^[1] ; Simoes, P. J. A. ^[3] ; Kudaka, A. S. ^[1] ; Valio, A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Escola Engn, Sao Paulo - Brazil

^[2] Consejo Nacl Invest Cient & Tecn, Inst Astron & Fis Espacio, Buenos Aires, DF - Argentina

^[3] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow, Lanark - Scotland

• Tipo de documento: Artigo Científico
• Fonte: SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS; v. 16, n. 9, p. 1261-1268, SEP 2018.
• Citações Web of Science: 1

Resumo

Active Region 12673 is the most productive active region of solar cycle 24: in a few days of early September 2017, four X-class and 27 M-class flares occurred. SOL2017-09-06T12:00, an X9.3 flare also produced a two-ribbon white light emission across the sunspot detected by Solar Dynamics Orbiter/Helioseismic and Magnetic Imager. The flare was observed at 212 and 405 GHz with the arcminute-sized beams of the Solar Submillimeter Telescope focal array while making a solar map and at 10 m, with a 17 arcsec diffraction-limited infrared camera. Images at 10 m revealed that the sunspot gradually increased in brightness while the event proceeded, reaching a temperature similar to quiet Sun values. From the images we derive a lower bound limit of 180-K flare peak excess brightness temperature or 7,000sfu if we consider a similar size as the white light source. The rising phase of mid-IR and white light is similar, although the latter decays faster, and the maximum of the mid-IR and white light emission is similar to 200s delayed from the 15.4-GHz peak occurrence. The submillimeter spectrum has a different origin than that of microwaves from 1 to 15 GHz, although it is not possible to draw a definitive conclusion about its emitting mechanism. (AU)

• Processo FAPESP: 13/24155-3 - Diagnóstico de explosões solares em inédito intervalo espectral, de micro-ondas até frequências THz: desafios para interpretação (FLAT)
• Beneficiário: Carlos Guillermo Giménez de Castro
• Linha de fomento: Auxílio à Pesquisa - Temático