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

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/Hel...

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Publicado: 2018
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15427390_v16_n9_p1261_GimenezdeCastro
http://hdl.handle.net/20.500.12110/paper_15427390_v16_n9_p1261_GimenezdeCastro
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15427390_v16_n9_p1261_GimenezdeCastro
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spelling paper:paper_15427390_v16_n9_p1261_GimenezdeCastro2023-06-08T16:21:08Z The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR 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 μm, with a 17 arcsec diffraction-limited infrared camera. Images at 10 μm 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 7,000 sfu 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 ∼200 s 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. ©2018. American Geophysical Union. All Rights Reserved. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15427390_v16_n9_p1261_GimenezdeCastro http://hdl.handle.net/20.500.12110/paper_15427390_v16_n9_p1261_GimenezdeCastro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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 μm, with a 17 arcsec diffraction-limited infrared camera. Images at 10 μm 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 7,000 sfu 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 ∼200 s 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. ©2018. American Geophysical Union. All Rights Reserved.
title The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
spellingShingle The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
title_short The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
title_full The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
title_fullStr The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
title_full_unstemmed The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid-IR
title_sort 6 september 2017 x9 super flare observed from submillimeter to mid-ir
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15427390_v16_n9_p1261_GimenezdeCastro
http://hdl.handle.net/20.500.12110/paper_15427390_v16_n9_p1261_GimenezdeCastro
_version_ 1768545896521269248

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