Automatic detection of small-scale EUV brightenings observed by the Solar Orbiter/EUI

被引：10

作者：

Alipour, N. ^{[1
]}

Safari, H. ^{[1
,2
]}

Verbeeck, C. ^{[3
]}

Berghmans, D. ^{[3
]}

Auchere, F. ^{[4
]}

Chitta, L. P. ^{[5
]}

Antolin, P. ^{[6
]}

Barczynski, K. ^{[7
,8
]}

Buchlin, E. ^{[4
]}

Cuadrado, R. Aznar ^{[5
]}

Dolla, L. ^{[3
]}

Georgoulis, M. K. ^{[9
]}

Gissot, S. ^{[3
]}

Harra, L. ^{[7
,8
]}

Katsiyannis, A. C. ^{[3
]}

Long, D. M. ^{[10
]}

Mandal, S. ^{[5
]}

Parenti, S. ^{[4
]}

Podladchikova, O. ^{[11
]}

Petrova, E. ^{[12
]}

Soubrie, E. ^{[4
]}

Schuehle, U. ^{[5
]}

Schwanitz, C. ^{[8
]}

Teriaca, L. ^{[5
]}

West, M. J. ^{[13
]}

Zhukov, A. N. ^{[3
,14
]}

机构：

[1] Univ Zanjan, Fac Sci, Dept Phys, Univ Blvd, Zanjan 4537138791, Iran

[2] Univ Zanjan, Fac Sci, Observ, Univ Blvd, Zanjan 4537138791, Iran

[3] Royal Observ Belgium, Solar Terr Ctr Excellence SIDC, Ringlaan 3 Av Circulaire, B-1180 Brussels, Belgium

[4] Univ Paris Saclay, CNRS, Inst Astrophys Spatiale, F-91405 Orsay, France

[5] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[6] Northumbria Univ, Dept Math Phys & Elect Engn, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

[7] Swiss Fed Inst Technol, Honggerberg Campus,HIT Bldg, Zurich, Switzerland

[8] World Radiat Ctr, Phys Meteorol Observatorium Davos, CH-7260 Davos, Switzerland

[9] RCAAM Acad Athens, 4 Soranou Efesiou St, Athens 11527, Greece

[10] UCL Mullard Space Sci Lab, Hoimbury St, Dorking RH5 6NT, Surrey, England

[11] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[12] Katholieke Univ Leuven, Ctr Math Plasma Astrophys, Math Dept, Celestijnenlaan 200B Bus 2400, B-3001 Leuven, Belgium

[13] Southwest Res Inst, 1050 Walnut St,Suite 300, Boulder, CO 80302 USA

[14] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119992, Russia

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 663卷

基金：

瑞士国家科学基金会;

关键词：

Sun: corona; Sun: UV radiation; techniques: high angular resolution; NANOFLARE MODEL; FREQUENCY-DISTRIBUTIONS; STATISTICAL PROPERTIES; ENERGY-DISTRIBUTION; AVALANCHE MODELS; QUIET SUN; FLARES; CORONA; BALLTRACKING; CANCELLATION;

D O I：

10.1051/0004-6361/202243257

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Accurate detections of frequent small-scale extreme ultraviolet (EUV) brightenings are essential to the investigation of the physical processes heating the corona. Aims. We detected small-scale brightenings, termed campfires, using their morphological and intensity structures as observed in coronal EUV imaging observations for statistical analysis. Methods. We applied a method based on Zernike moments and a support vector machine (SVM) classifier to automatically identify and track campfires observed by Solar Orbiter/Extreme Ultraviolet Imager (EUI) and Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA). Results. This method detected 8678 campfires (with length scales between 400 km and 4000 km) from a sequence of 50 High Resolution EUV telescope (HRIEUV) 174 angstrom images. From 21 near co-temporal AIA images covering the same field of view as EUI, we found 1131 campfires, 58% of which were also detected in HRIEUV images. In contrast, about 16% of campfires recognized in HRIEUV were detected by AIA. We obtain a campfire birthrate of 2 x 10(-16) m(-2) s(-1). About 40% of campfires show a duration longer than 5 s, having been observed in at least two HRIEUV images. We find that 27% of campfires were found in coronal bright points and the remaining 73% have occurred out of coronal bright points. We detected 23 EUI campfires with a duration greater than 245 s. We found that about 80% of campfires are formed at supergranular boundaries, and the features with the highest total intensities are generated at network junctions and intense H I Lyman-alpha emission regions observed by EUI /HRILya. The probability distribution functions for the total intensity, peak intensity, and projected area of campfires follow a power law behavior with absolute indices between 2 and 3. This self-similar behavior is a possible signature of self-organization, or even self-organized criticality, in the campfire formation process.

引用

页数：12

共 74 条

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