Flare Induced Sunquake Signatures in the Ultraviolet as Observed by the Atmospheric Imaging Assembly. (arXiv:2105.05704v1 [astro-ph.SR])

Flare Induced Sunquake Signatures in the Ultraviolet as Observed by the Atmospheric Imaging Assembly. (arXiv:2105.05704v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Quinn_S/0/1/0/all/0/1">Sean Quinn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mathioudakis_M/0/1/0/all/0/1">Mihalis Mathioudakis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nelson_C/0/1/0/all/0/1">Christopher J. Nelson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Milligan_R/0/1/0/all/0/1">Ryan O. Milligan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reid_A/0/1/0/all/0/1">Aaron Reid</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jess_D/0/1/0/all/0/1">David B. Jess</a>

Sunquakes (SQs) have been routinely observed in the solar photosphere, but it
is only recently that signatures of these events have been detected in the
chromosphere. We investigate whether signatures of SQs are common in
Ultraviolet (UV) continua, which sample the solar plasma several hundred km
above where SQs are typically detected. We analyse observations from the Solar
Dynamics Observatory’s Atmospheric Imaging Assembly (SDO/AIA) 1600 {AA} and
1700 {AA} passbands, for SQ signatures induced by the flares of Solar Cycle
24. We base our analysis on the 62 SQs detected in the recent statistical study
presented by Sharykin & Zosovichev (2020). We find that 9 out of 62 SQ
candidates produced a response that is clearly detected in running difference
images from the AIA 1600 {AA} and 1700 {AA} channels. A binary frequency
filter with a width of 2 mHz, centred on 6 mHz, was applied to the data. The
first signature of each SQ was detected at distances between 5.2 Mm to 25.7 Mm
from the associated flare ribbon. Time-distance and regression analysis allowed
us to calculate the apparent transverse velocities of the SQs in the UV
datasets and found maximum velocities as high as 41 km s-1, 87 Mm away from the
SQ source. Our analysis shows that flare induced SQ signatures can be detected
in the SDO/AIA 1600 {AA} and 1700 {AA} passbands, hinting at their presence
in the lower chromosphere. There was no apparent correlation between GOES flare
classification, and the appearance of the SQ at these heights.

Sunquakes (SQs) have been routinely observed in the solar photosphere, but it
is only recently that signatures of these events have been detected in the
chromosphere. We investigate whether signatures of SQs are common in
Ultraviolet (UV) continua, which sample the solar plasma several hundred km
above where SQs are typically detected. We analyse observations from the Solar
Dynamics Observatory’s Atmospheric Imaging Assembly (SDO/AIA) 1600 {AA} and
1700 {AA} passbands, for SQ signatures induced by the flares of Solar Cycle
24. We base our analysis on the 62 SQs detected in the recent statistical study
presented by Sharykin & Zosovichev (2020). We find that 9 out of 62 SQ
candidates produced a response that is clearly detected in running difference
images from the AIA 1600 {AA} and 1700 {AA} channels. A binary frequency
filter with a width of 2 mHz, centred on 6 mHz, was applied to the data. The
first signature of each SQ was detected at distances between 5.2 Mm to 25.7 Mm
from the associated flare ribbon. Time-distance and regression analysis allowed
us to calculate the apparent transverse velocities of the SQs in the UV
datasets and found maximum velocities as high as 41 km s-1, 87 Mm away from the
SQ source. Our analysis shows that flare induced SQ signatures can be detected
in the SDO/AIA 1600 {AA} and 1700 {AA} passbands, hinting at their presence
in the lower chromosphere. There was no apparent correlation between GOES flare
classification, and the appearance of the SQ at these heights.

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