EMISSION MEASURE DISTRIBUTION FOR DIFFUSE REGIONS IN SOLAR ACTIVE REGIONS

被引：14

作者：

Subramanian, Srividya ^{[1
]}

Tripathi, Durgesh ^{[1
]}

Klimchuk, James A. ^{[2
]}

Mason, Helen E. ^{[3
]}

机构：

[1] Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 795卷 / 01期

关键词：

methods: observational; Sun: abundances; Sun: atmosphere; Sun: corona; Sun: transition region; Sun: UV radiation; techniques: spectroscopic; ULTRAVIOLET IMAGING SPECTROMETER; TRANSITION-REGION; TIME-DEPENDENCE; DOPPLER SHIFTS; CORE; LOOP; DIAGNOSTICS; PATTERNS; LINES;

D O I：

10.1088/0004-637X/795/1/76

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Our knowledge of the diffuse emission that encompasses active regions is very limited. In this paper we investigate two off-limb active regions, namely, AR 10939 and AR 10961, to probe the underlying heating mechanisms. For this purpose, we have used spectral observations from Hinode/EIS and employed the emission measure (EM) technique to obtain the thermal structure of these diffuse regions. Our results show that the characteristic EM distributions of the diffuse emission regions peak at log T = 6.25 and the coolward slopes are in the range 1.4-3.3. This suggests that both low-as well as high-frequency nanoflare heating events are at work. Our results provide additional constraints on the properties of these diffuse emission regions and their contribution to the background/foreground when active region cores are observed on-disk.

引用

页数：11

共 46 条

[1] DIAGNOSING THE TIME-DEPENDENCE OF ACTIVE REGION CORE HEATING FROM THE EMISSION MEASURE. I. LOW-FREQUENCY NANOFLARES [J].

Bradshaw, S. J. ;

Klimchuk, J. A. ;

Reep, J. W. .

ASTROPHYSICAL JOURNAL, 2012, 758 (01)

[2]

Brooks D. H., 2009, APJ, V703, P10

[3] The EUV imaging spectrometer for Hinode [J].

Culhane, J. L. ;

Harra, L. K. ;

James, A. M. ;

Al-Janabi, K. ;

Bradley, L. J. ;

Chaudry, R. A. ;

Rees, K. ;

Tandy, J. A. ;

Thomas, P. ;

Whillock, M. C. R. ;

Winter, B. ;

Doschek, G. A. ;

Korendyke, C. M. ;

Brown, C. M. ;

Myers, S. ;

Mariska, J. ;

Seely, J. ;

Lang, J. ;

Kent, B. J. ;

Shaughnessy, B. M. ;

Young, P. R. ;

Simnett, G. M. ;

Castelli, C. M. ;

Mahmoud, S. ;

Mapson-Menard, H. ;

Probyn, B. J. ;

Thomas, R. J. ;

Davila, J. ;

Dere, K. ;

Windt, D. ;

Shea, J. ;

Hagood, R. ;

Moye, R. ;

Hara, H. ;

Watanabe, T. ;

Matsuzaki, K. ;

Kosugi, T. ;

Hansteen, V. ;

Wikstol, O. .

SOLAR PHYSICS, 2007, 243 (01) :19-61

[4] The Solar-B EUV imaging spectrometer and its science goals [J].

Culhane, JL ;

Harra, LK ;

Doschek, GA ;

Mariska, JT ;

Watanabe, T ;

Hara, H .

SOLAR ENCOUNTER, SOLAR-B AND STEREO, 2005, 36 (08) :1494-1502

[5] Doppler shift of hot coronal lines in a moss area of an active region [J].

Dadashi, N. ;

Teriaca, L. ;

Tripathi, D. ;

Solanki, S. K. ;

Wiegelmann, T. .

ASTRONOMY & ASTROPHYSICS, 2012, 548

[6] The multi-thermal emission in solar active regions [J].

Del Zanna, G. .

ASTRONOMY & ASTROPHYSICS, 2013, 558

[7] Solar active regions: SOHO/CDS and TRACE observations of quiescent coronal loops [J].

Del Zanna, G ;

Mason, HE .

ASTRONOMY & ASTROPHYSICS, 2003, 406 (03) :1089-1103

[8]

Del Zanna G., 2014, SOPH UNPUB

[9] NONTHERMAL VELOCITIES IN THE SOLAR TRANSITION ZONE OBSERVED WITH THE HIGH-RESOLUTION TELESCOPE AND SPECTROGRAPH [J].

DERE, KP ;

MASON, HE .

SOLAR PHYSICS, 1993, 144 (02) :217-241

[10] CHIANTI - an atomic database for emission lines .1. Wavelengths greater than 50 angstrom [J].

Dere, KP ;

Landi, E ;

Mason, HE ;

Fossi, BCM ;

Young, PR .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 125 (01) :149-173

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