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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

CiteScore 2018: 0.24

SCImago Journal Rank (SJR) 2018: 0.202
Source Normalized Impact per Paper (SNIP) 2018: 0.144

ICV 2018: 120.66

Open Access
Online
ISSN
2543-6376
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Volume 25, Issue 2

Issues

Depressed Emission between Magnetic Arcades near a Sunspot

B. I. Ryabov / K. Shibasaki
Published Online: 2017-02-01 | DOI: https://doi.org/10.1515/astro-2017-0124

Abstract

The locations of the depressed emission in microwaves, EUV and soft X-rays are compared with each other and with the location of the plasma outflow in the active region (AR) 8535 on the Sun. We found that two open-field regions overlap the regions of depressed emission near the AR's sunspot. These two open-field regions are simulated with the potential-field source-surface (PFSS) model under radial distances of RSS = 1.8 R and RSS = 2.5 R. Each open-field region is located between the arcades of the loops of the same magnetic polarity. The former open-field region covers the region of the plasma outflow, which is thus useful for the tests on connection to the heliosphere. The utmost microwave depression of the intensity in the ordinary mode (the Very Large Array 15 GHz observations) also overlaps the region of the plasma outflow and thus indicates this outflow. The lasting for eight days depression in soft X-rays and the SOHO EIT 2.84×10−8 m images are attributed to the evacuation of as hot coronal plasma as T ≥ 2 × 106 K from the extended in height (“open”) magnetic structures. We conclude that the AR 8535 presents the sunspot atmosphere affected by the large-scale magnetic fields.

Keywords: Sun: sunspots; radio radiation; EUV; X-rays; magnetic fields

REFERENCES

About the article

Received: 2016-02-15

Accepted: 2016-04-21

Published Online: 2017-02-01

Published in Print: 2016-06-01


Citation Information: Open Astronomy, Volume 25, Issue 2, Pages 225–235, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0124.

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© 2016 B. I. Ryabov et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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[1]
B. I. Ryabov and A. Vrublevskis
Solar Physics, 2020, Volume 295, Number 1

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