Bulk heating and slender magnetic loops in the solar corona

被引:128
作者
Gudiksen, BV [1 ]
Nordlund, Å
机构
[1] SCFAB, Inst Solar Phys, S-10691 Stockholm, Sweden
[2] Univ Copenhagen, NBIAfG, Astron Observ, DK-1350 Copenhagen K, Denmark
关键词
MHD; Sun : corona; Sun : magnetic fields; Sun : transition region;
D O I
10.1086/341600
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The heating of the solar corona and the puzzle of the slender high reaching magnetic loops seen in observations from the Transition Region and Coronal Explorer (TRACE) has been investigated through three-dimensional numerical simulations and found to be caused by the well-observed plasma flows in the photosphere displacing the footpoints of magnetic loops in a nearly potential configuration. It is found that even the small convective displacements cause magnetic dissipation sufficient to heat the corona to temperatures of the order of a million K. The heating is intermittent in both space and time-at any one height and time it spans several orders of magnitude, and localized heating causes transonic flows along field lines, which explains the observed nonhydrostatic stratification of loops that are bright in emission measure.
引用
收藏
页码:L113 / L116
页数:4
相关论文
共 21 条
[1]   Evidence for nonuniform heating of coronal loops inferred from multithread modeling of TRACE data [J].
Aschwanden, MJ ;
Nightingale, RW ;
Alexander, D .
ASTROPHYSICAL JOURNAL, 2000, 541 (02) :1059-1077
[2]   Time variability of the "quiet" Sun observed with TRACE.: II.: Physical parameters, temperature evolution, and energetics of extreme-ultraviolet nanoflares [J].
Aschwanden, MJ ;
Tarbell, TD ;
Nightingale, RW ;
Schrijver, CJ ;
Title, A ;
Kankelborg, CC ;
Martens, P ;
Warren, HP .
ASTROPHYSICAL JOURNAL, 2000, 535 (02) :1047-1065
[3]   An evaluation of coronal heating models for active regions based on Yohkoh, Soho, and TRACE observations [J].
Aschwanden, MJ .
ASTROPHYSICAL JOURNAL, 2001, 560 (02) :1035-1044
[4]   Modeling of coronal EUV loops observed with TRACE.: I.: Hydrostatic solutions with nonuniform heating [J].
Aschwanden, MJ ;
Schrijver, CJ ;
Alexander, D .
ASTROPHYSICAL JOURNAL, 2001, 550 (02) :1036-1050
[5]   Heating and activity of the solar corona .1. Boundary shearing of an initially homogeneous magnetic field [J].
Galsgaard, K ;
Nordlund, A .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1996, 101 (A6) :13445-13460
[6]   Recent theoretical results on coronal heating [J].
Gomez, DO ;
Dmitruk, PA ;
Milano, LJ .
SOLAR PHYSICS, 2000, 195 (02) :299-318
[7]   The viability of ohmic dissipation as a coronal heating source [J].
Hendrix, DL ;
VanHoven, G ;
Mikic, Z ;
Schnack, DD .
ASTROPHYSICAL JOURNAL, 1996, 470 (02) :1192-1197
[8]   A SELF-CONSISTENT TURBULENT MODEL FOR SOLAR CORONAL HEATING [J].
HEYVAERTS, J ;
PRIEST, ER .
ASTROPHYSICAL JOURNAL, 1992, 390 (01) :297-308
[9]  
KAHN FD, 1976, ASTRON ASTROPHYS, V50, P145
[10]   EVOLUTION AND STATISTICS OF CURRENT SHEETS IN CORONAL MAGNETIC LOOPS [J].
LONGCOPE, DW ;
SUDAN, RN .
ASTROPHYSICAL JOURNAL, 1994, 437 (01) :491-504