THE ROOTS OF CORONAL STRUCTURE IN THE SUNS SURFACE

被引:12
作者
GOLUB, L [1 ]
ZIRIN, H [1 ]
WANG, HM [1 ]
机构
[1] CALTECH,BIG BEAR SOLAR OBSERV,PASADENA,CA 91125
关键词
D O I
10.1007/BF00712500
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have compared the structures seen on X-ray images obtained by a flight of the NIXT sounding rocket payload on July 11, 1991 with near-simultaneous photospheric and chromospheric structures and magnetic fields observed at Big Bear. The X-ray images reflect emission of both Mg X and Fe XVI, formed at 1 x 10(6) K and 3 x 10(6) K, respectively. The brightest H alpha sources correspond to a dying sub-flare and other active region components, all of which reveal coronal enhancements situated spatially well above the H alpha emission. The largest set of X-ray arches connected plages of opposite polarity in a large bipolar active region. The arches appear to lie in a small range of angle in the meridian plane connecting their footpoints. Sunspots are dark on the surface and in the corona. For the first time we see an emerging flux region in X-rays and find the emission extends twice as high as the H alpha arches. Many features which we believe to correspond to 'X-ray bright points' (XBPs) were observed. Whether by resolution or spectral band, the number detected greatly exceeds that from previous work. All of the brighter XBPs correspond to bipolar Her features, while unipolar Ha bright points are the base of more diffuse comet-like coronal arches, generally vertical. These diverge from individual features by less than 30 degrees, and give a good measure of what the 'canopies' must do. The H alpha data shows that all the H alpha features were present the entire day, so they are not clearly disappearing or reappearing. We find a new class of XBPs which we call 'satellite points', elements of opposite polarity linked to nearby umbrae by invisible field lines. The satellite points change rapidly in X-ray brightness during the flight. An M1.9 flare occurred four hours after the flight; examination of the pre-flare structures reveals nothing unusual.
引用
收藏
页码:179 / 198
页数:20
相关论文
共 19 条
  • [1] ALLEN CW, 1981, ASTROPHYSICAL QUANTI, P98
  • [2] THE VERTICAL STRUCTURE OF ARCH FILAMENT SYSTEMS IN SOLAR EMERGING FLUX REGIONS
    CHOU, DY
    ZIRIN, H
    [J]. ASTROPHYSICAL JOURNAL, 1988, 333 (01) : 420 - &
  • [3] GAIZAUSKAS V, 1992, COMMUNICATION
  • [4] MICROWAVE STRUCTURE OF THE QUIET SUN AT 8.5 GHZ
    GARY, DE
    ZIRIN, H
    WANG, HM
    [J]. ASTROPHYSICAL JOURNAL, 1990, 355 (01) : 321 - 328
  • [5] THE 3-DIMENSIONAL STRUCTURE OF ATMOSPHERIC MAGNETIC-FIELDS IN 2 ACTIVE REGIONS
    GIOVANELLI, RG
    JONES, HP
    [J]. SOLAR PHYSICS, 1982, 79 (02) : 267 - 278
  • [6] SUB-ARCSECOND OBSERVATIONS OF THE SOLAR-X-RAY CORONA
    GOLUB, L
    HERANT, M
    KALATA, K
    LOVAS, I
    NYSTROM, G
    PARDO, F
    SPILLER, E
    WILCZYNSKI, J
    [J]. NATURE, 1990, 344 (6269) : 842 - 844
  • [7] GOLUB L, 1986, NASA CP2442
  • [8] GOLUB L, 1989, P SPIE, V1160
  • [9] HARVEY JW, 1975, OSS MEM OSS ARCETRI, V104, P53
  • [10] HARVEY K, 1992, COMMUNICATION