Observations of Doppler shifts in a solar polar coronal hole

被引：34

作者：

Warren, HP ^{[1
]}

Mariska, JT ^{[1
]}

Wilhelm, K ^{[1
]}

机构：

[1] MAX PLANCK INST AERON,D-37191 KATLENBURG DUHM,GERMANY

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 490卷 / 02期

基金：

美国国家航空航天局;

关键词：

line; profiles; sun; transition region; UV radiation;

D O I：

10.1086/311041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using observations from the Solar Ultraviolet Measurements of Emitted Radiation experiment flown on the Solar and Heliospheric Observatory spacecraft, we have measured Doppler wavelength shifts in the north polar coronal hole in the 1032 and 1038 Angstrom emission Lines of O VI and the 1036 and 1037 Angstrom emission lines of C II relative to chromospheric emission lines. These observations were obtained on 1996 November 2 when the north polar coronal hole boundary extended southward to about 750 '' (cos theta = 0.65). Our measurements indicate the presence of average net redshifts in coronal holes at temperatures of less than 2.9 x 10(5) K. Measurements of systematic wavelength shifts in the Ne VIII resonance lines relative to the quiet Sun suggest a transition to average net outflows near 6.3 x 10(5) K in the coronal hole.

引用

页码：L187 / &

页数：5

共 21 条

[1] OBSERVED REDSHIFTS IN THE SOLAR TRANSITION REGION ABOVE ACTIVE AND QUIET REGIONS [J].