Blueshifted Si iv 1402.77 angstrom Line Profiles in a Moving Flare Kernel Observed by IRIS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00559604" target="_blank" >RIV/67985815:_____/22:00559604 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0333348" target="_blank" >https://hdl.handle.net/11104/0333348</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ac78e2" target="_blank" >10.3847/1538-4357/ac78e2</a>

Result language

angličtina

Original language name

Blueshifted Si iv 1402.77 angstrom Line Profiles in a Moving Flare Kernel Observed by IRIS

Original language description

We analyze the spectra of a slipping flare kernel observed during the 2015 June 22 M6.5-class flare by the Interface Region Imaging Spectrograph (IRIS). During the impulsive and peak phases of the flare, loops exhibiting an apparent slipping motion along the ribbons were observed in the 131 angstrom channel of SDO/AIA. The IRIS spectrograph slit observed a portion of the ribbons, including a moving kernel corresponding to a flare loop footpoint in Si iv, C ii, and Mg ii at a very-high 1 s cadence. The spectra observed in the kernel were mostly redshifted and exhibited pronounced red wings, as typically observed in large flares. However, in a small region in one of the ribbons, the Si iv 1402.77 angstrom line was partially blueshifted, with the corresponding Doppler velocity divide v (D) divide exceeding 50 km s(-1). In the same region, the C ii 1334.53, 1335.66, and 1335.71 angstrom lines were weakly blueshifted ( divide v (D) divide < 20 km s(-1)) and showed pronounced blue wings, which were also observed in the Mg ii k 2796.35 angstrom as well as the Mg ii triplet 2798.75 and 2798.82 angstrom lines. Using high-cadence AIA observations we found that the region where the blueshifts occurred corresponds to the accelerating kernel front as it moved through a weak field region. The IRIS observations with high resolution allowed us to capture the acceleration of the kernel under the slit for the first time. The unique observations of blueshifted chromospheric and TR lines provide new constraints for current models of flares.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA20-07908S" target="_blank" >GA20-07908S: Three-dimensional magnetic reconnection in early phases of solar flares and eruptions: Observations and the Standard Model in 3D</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Volume of the periodical

934

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

80

UT code for WoS article

000830789500001

EID of the result in the Scopus database

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