EVOLUTION OF THE MAGNETIC FIELD INCLINATION IN A FORMING PENUMBRA

被引：33

作者：

Romano, P. ^{[1
]}

Guglielmino, S. L. ^{[2
,3
]}

Cristaldi, A. ^{[2
,3
]}

Ermolli, I. ^{[4
]}

Falco, M. ^{[2
,3
]}

Zuccarello, F. ^{[2
,3
]}

机构：

[1] INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy

[2] Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy

[3] Univ Catania, Sez Astrofis, I-95123 Catania, Italy

[4] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 784卷 / 01期

基金：

美国国家科学基金会;

关键词：

Sun: chromosphere; Sun: magnetic fields; Sun: photosphere; SUNSPOT PENUMBRA; FLOWS; PORES;

D O I：

10.1088/0004-637X/784/1/10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe the evolution of the magnetic and velocity fields in the annular zone around a pore a few hours before the formation of its penumbra. We detected the presence of several patches at the edge of the annular zone, with a typical size of about 1 ''. These patches are characterized by a rather vertical magnetic field with polarity opposite to that of the pore. They correspond to regions of plasma upflow up to 2.5 km s(-1) and are characterized by radially outward displacements with horizontal velocities up to 2 km s(-1). We interpret these features as portions of the pore magnetic field lines returning beneath the photosphere being progressively stretched and pushed down by the overlying magnetic fields. Our results confirm that the penumbra formation results from changes in the inclination of the field lines in the magnetic canopy overlying the pore, until they reach the photosphere.

引用

页数：6

共 18 条

[1] IBIS: A new post-focus instrument for solar imaging spectroscopy [J].

Cavallini, F. .

SOLAR PHYSICS, 2006, 236 (02) :415-439

[2] INVERSION OF STOKES PROFILES [J].

COBO, BR ;

INIESTA, JCD .

ASTROPHYSICAL JOURNAL, 1992, 398 (01) :375-385

[3] OBSERVATIONS OF MOVING MAGNETIC FEATURES NEAR SUNSPOTS [J].

HARVEY, K ;

HARVEY, J .

SOLAR PHYSICS, 1973, 28 (01) :61-71

[4] Fine-scale structures of the evershed effect observed by the Solar Optical Telescope aboard Hinode [J].

Ichimoto, Kiyoshi ;

Shine, Richard A. ;

Lites, Bruce ;

Kubo, Masahitc ;

Shimizu, Toshifumi ;

Suematsu, Yoshinori ;

Tsuneta, Saku ;

Katsukawa, Yukio ;

Tarbell, Theodore D. ;

Title, Alan M. ;

Nagata, Shin'ichi ;

Yokoyama, Takaaki ;

Shimojo, Masumi .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2007, 59 :S593-S599

[5]

Keppens R, 1996, ASTRON ASTROPHYS, V316, P229

[6] Inclination of magnetic fields and flows in sunspot penumbrae [J].

Langhans, K ;

Scharmer, GB ;

Kiselman, D ;

Löfdahl, MG ;

Berger, TE .

ASTRONOMY & ASTROPHYSICS, 2005, 436 (03) :1087-1101

[7] The evolution of pores and the development of penumbrae [J].

Leka, KD ;

Skumanich, A .

ASTROPHYSICAL JOURNAL, 1998, 507 (01) :454-469

[8] OBSERVATION OF A NON-RADIAL PENUMBRA IN A FLUX EMERGING REGION UNDER CHROMOSPHERIC CANOPY FIELDS [J].

Lim, Eun-Kyung ;

Yurchyshyn, Vasyl ;

Goode, Philip ;

Cho, Kyung-Suk .

ASTROPHYSICAL JOURNAL LETTERS, 2013, 769 (01)

[9] PENUMBRAL FINE STRUCTURE AND DRIVING MECHANISMS OF LARGE-SCALE FLOWS IN SIMULATED SUNSPOTS [J].

Rempel, M. .

ASTROPHYSICAL JOURNAL, 2011, 729 (01)

[10] The formation of sunspot penumbra Magnetic field properties [J].

Rezaei, R. ;

Gonzalez, N. Bello ;

Schlichenmaier, R. .

ASTRONOMY & ASTROPHYSICS, 2012, 537

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