The magnetic structure of a coronal X-ray bright point

被引:56
作者
Brown, DS [1 ]
Parnell, CE
Deluca, EE
Golub, L
McMullen, RA
机构
[1] Univ St Andrews, Inst Math, St Andrews KY16 9SS, Fife, Scotland
[2] Smithsonian Astrophys Observ, Cambridge, MA 02188 USA
[3] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA
关键词
D O I
10.1023/A:1017907406350
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
X-ray bright points are small dynamic loop structures that are observed all over the solar corona. The high spatial and temporal resolution of the TRACE instrument allows bright points to be studied in much greater detail than previously possible. This paper focuses on a specific bright point which occurred for about 20 hours on 13-14 June 1998 and examines its dynamic structure in detail. This example suggests that the mechanisms that cause bright points to form and evolve are more complex than previously thought. In this case, reconnection probably plays a major part during the formation and brightening of the loop structure. However, later on the foot points rotate injecting twist into the bright point which may cause an instability to occur with dynamic results.
引用
收藏
页码:305 / 321
页数:17
相关论文
共 18 条
[1]   Unstable coronal loops: Numerical simulations with predicted observational signatures [J].
Arber, TD ;
Longbottom, AW ;
Van der Linden, RAM .
ASTROPHYSICAL JOURNAL, 1999, 517 (02) :990-1001
[2]   Topological differences and similarities between force-free and potential models of coronal magnetic fields [J].
Brown, DS ;
Priest, ER .
SOLAR PHYSICS, 2000, 194 (02) :197-204
[3]   Topological bifurcations in three-dimensional magnetic fields [J].
Brown, DS ;
Priest, ER .
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1999, 455 (1991) :3931-3951
[4]   The topological behaviour of stable magnetic separators [J].
Brown, DS ;
Priest, ER .
SOLAR PHYSICS, 1999, 190 (1-2) :25-33
[5]   SOLAR X-RAY BRIGHT POINTS [J].
GOLUB, L ;
KRIEGER, AS ;
SILK, JK ;
TIMOTHY, AF ;
VAIANA, GS .
ASTROPHYSICAL JOURNAL, 1974, 189 (02) :L93-&
[6]   OBSERVATION OF SPATIAL AND TEMPORAL VARIATIONS IN X-RAY BRIGHT POINT EMERGENCE PATTERNS [J].
GOLUB, L ;
KRIEGER, AS ;
VAIANA, GS .
SOLAR PHYSICS, 1976, 50 (02) :311-327
[7]  
GOLUB L, 1976, SOL PHYS, V49, P79, DOI 10.1007/BF00221486
[8]  
HARVEY KL, 1985, AUST J PHYS, V38, P875
[9]  
HARVEY KL, 1993, FRONTIERS SCI SERIES, P21
[10]   A COMPARISON OF ACTIVE-REGION TEMPERATURES AND EMISSION MEASURES OBSERVED IN SOFT X-RAYS AND MICROWAVES AND IMPLICATIONS FOR CORONAL HEATING [J].
KLIMCHUK, JA ;
GARY, DE .
ASTROPHYSICAL JOURNAL, 1995, 448 (02) :925-937