Magnetic and velocity fields of a solar pore

被引：0

作者：

机构：

[1] Sobotka, M.

[2] Del Moro, D.

[3] Jurčák, J.

[4] Berrilli, F.

来源：

Sobotka, M. (msobotka@asu.cas.cz) | 1600年 / EDP Sciences卷 / 537期

关键词：

Context. Solar pores are intermediate-size magnetic flux features that emerge at the surface of the Sun. The absence of a filamentary penumbra indicates that there is a relatively simple magnetic structure with a prevailing vertical magnetic field. Aims. Relations between the magnetic field components; line-of-sight velocities; and horizontal motions in and around a large pore (Deff = 8′′.5) are analysed to provide observational constraints on theoretical models and numerical simulations. Methods. Spectropolarimetric observations in Fe I 617.3 nm of the pore NOAA 11005 with the IBIS spectrometer attached to the Dunn Solar Telescope are inverted into series of maps of thermal; magnetic; and velocity parameters using the SIR code. Horizontal velocities are obtained from series of white-light images by means of local correlation tracking. Results. The magnetic field B extends from the visible pore border of more than 3′′.5 and has a radial structure in a form of spines that are co-spatial with dark intergranular lanes. The horizontal component Bhor is more extended than the vertical component Bz. The temperature linearly decreases with increasing Bz; by about-300 K kG-1 in the photosphere and-800 K kG-1 in the umbra. The temperature contrast of granulation increases with increasing magnetic field strength and is then suppressed for Bz > 1200 G. Granular upflows dominate in regions with Bzhor > 1000 G. Horizontal motions of granules start to be damped for Bz > 500 G and recurrently exploding granules appear only in magnetic fields comparable to or weaker than the equipartition field strength 400 G. © 2012 ESO;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Journal article (JA)

引用

共 50 条

[41] MAGNETIC FIELDS IN SOLAR FLARES
BRUCE, CER
OBSERVATORY, 1966, 86 (951): : 82 - &
[42] Magnetic fields in the solar photosphere
Bushby, Paul J.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2008, 366 (1884): : 4465 - 4476
[43] Magnetic and velocity fields of active regions
Choudhary, DP
Gosain, S
ASTRONOMISCHE NACHRICHTEN, 2003, 324 (04) : 362 - 363
[44] Velocity and magnetic fields in and around pores
Sankarasubramanian, K
Rimmele, T
CURRENT THEORETICAL MODELS AND HIGH RESOLUTION SOLAR OBSERVATIONS: PREPARING FOR ATST, 2003, 286 : 291 - 298
[45] STELLAR AND SOLAR MAGNETIC FIELDS
VANBUERE.HG
SPACE SCIENCE REVIEWS, 1966, 5 (03) : 435 - &
[46] STELLAR AND SOLAR MAGNETIC FIELDS
MICHARD, R
ANNALES D ASTROPHYSIQUE, 1965, 28 (04): : 748 - &
[47] Magnetic fields and solar activities
Zhang, H. Q.
ASTROPHYSICS AND SPACE SCIENCE, 2006, 305 (03) : 211 - 224
[48] Fibrillation of solar magnetic fields
J. M.A. Ashbourn
L. C. Woods
The European Physical Journal D, 2009, 53 : 205 - 212
[49] VELOCITY GRADIENTS AS A TRACER FOR MAGNETIC FIELDS
Gonzalez-Casanova, Diego F.
Lazarian, A.
ASTROPHYSICAL JOURNAL, 2017, 835 (01):
[50] Solar magnetic cycle and surface magnetic fields
Benevolenskaya, EE
IZVESTIYA AKADEMII NAUK SERIYA FIZICHESKAYA, 1998, 62 (09): : 1815 - 1818

← 1 2 3 4 5 →