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The chromospheric response to the sunquake generated by the X9.3 flare of NOAA 12673

Quinn, Sean; Reid, Aaron; Mathioudakis, Mihalis; Nelson, Christoper; Prasad, S Krishna; Zharkov, Sergei

Authors

Sean Quinn

Aaron Reid

Mihalis Mathioudakis

Christoper Nelson

S Krishna Prasad



Abstract

Active region NOAA 12673 was extremely volatile in 2017 September, producing many solar flares, including the largest of solar cycle 24, an X9.3 flare of 06 September 2017. It has been reported that this flare produced a number of sunquakes along the flare ribbon (Sharykin & Kosovichev 2018; Zhao & Chen 2018). We have used co-temporal and co-spatial Helioseismic and Magnetic Imager (HMI) line-of-sight (LOS) and Swedish 1-m Solar Telescope observations to show evidence of the chromospheric response to these sunquakes. Analysis of the Ca II 8542Å8542Å line profiles of the wavefronts revealed that the crests produced a strong blue asymmetry, whereas the troughs produced at most a very slight red asymmetry. We used the combined HMI, SST datasets to create time-distance diagrams and derive the apparent transverse velocity and acceleration of the response. These velocities ranged from 4.5 km s −1 to 29.5 km s −1 with a constant acceleration of 8.6 x 10 −3 km s −2. We employed NICOLE inversions, in addition to the Center-of-Gravity (COG) method to derive LOS velocities ranging 2.4 km s −1 to 3.2 km s −1. Both techniques show that the crests are created by upflows. We believe that this is the first chromospheric signature of a flare induced sunquake.

Journal Article Type Article
Publication Date Aug 14, 2019
Journal The Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 881
Issue 1
Article Number 82
APA6 Citation Krishna Prasad, S., Quinn, S., Reid, A., Mathioudakis, M., Nelson, C., Prasad, S. K., & Zharkov, S. (2019). The chromospheric response to the sunquake generated by the X9.3 flare of NOAA 12673. The Astrophysical journal, 881(1), https://doi.org/10.3847/1538-4357/ab2c9e
DOI https://doi.org/10.3847/1538-4357/ab2c9e
Keywords Sun: chromosphere; Sun: quakes; Sun: flares; Sun: helioseismology
Publisher URL https://iopscience.iop.org/article/10.3847/1538-4357/ab2c9e/meta
Additional Information Journal title: The Astrophysical Journal; Article type: paper; Article title: The Chromospheric Response to the Sunquake Generated by the X9.3 Flare of NOAA 12673; Copyright information: © 2019. The American Astronomical Society. All rights reserved.; Date received: 2019-04-18; Date accepted: 2019-06-19; Online publication date: 2019-08-14

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Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.







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