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서지반출
NONTHERMAL BROADENING OF UV LINES OBSERVED AT THE LIMB OF THE QUIET SUN
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  • NONTHERMAL BROADENING OF UV LINES OBSERVED AT THE LIMB OF THE QUIET SUN
  • NONTHERMAL BROADENING OF UV LINES OBSERVED AT THE LIMB OF THE QUIET SUN
저자명
LEE. HVUNSOOK,YUN. HONG SIK,CHAE. JONGCHUL
간행물명
Journal of the Korean astronomical society
권/호정보
2000년|33권 1호|pp.57-73 (17 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

We have done a spectroscopic study of the solar transition region using high resolution UV & EUV data obtained by SUMER(Solar Ultraviolet Measurements of Emitted Radiation) on board SOHO(Solar and Heliospheric Observatory). Optically thin and conspicuous emission lines observed at the solar limb are carefully selected to acquire average values of physical parameters for the quiet region as a function of radial distance. Our main results found from the present study can be summarized as follows. 1) Nonthermal velocities estimated from various UV lines do not decrease with height at least within one total line intensity scale height above the limb. 2) Nonthermal velocity distribution with temperature is very similar to that of the disk center, in the sense that its peak is located around $2{ imes}10^5 K$, but the value is systematically larger than that of the disk. 3) It is found that nonthermal velocity is inversely proportional. to quadratic root of electron density up to about 10 arc seconds above the limb, i.e. ${xi}~N_e^{-1/4}$, implying that the observed nonthermal broadening can be attributed to Alfven waves passing through the medium. 41 Electron density estimated from the O V 629/760 line ratio is found to range from about $1{ imes}10^{10}cm^{-3}$ to $2{ imes} 10^{12}cm^{-3}$ in the transition region.