Solar and heliospheric observatory observations of a helical coronal mass ejection

被引：83

作者：

Ciaravella, A

Raymond, JC

Thompson, BJ

van Ballegooijen, A

Strachan, L

Li, J

Gardner, L

O'Neal, R

Antonucci, E

Kohl, J

Noci, G

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Dipartimento Sci Fis & Astron, I-90134 Palermo, Italy

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Osservatorio Astron Torino, I-10125 Pino Torinese, Italy

[5] Univ Florence, Dipartimento Astron & Sci Spazio, I-50125 Florence, Italy

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 529卷 / 01期

关键词：

Sun : corona; Sun : prominences; Sun : UV radiation;

D O I：

10.1086/308260

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The EUV Imaging Telescope (EIT), Large Angle Spectrometric Coronagraph (LASCO), and Ultraviolet Coronagraph Spectrometer (UVCS) instruments aboard the SOHO satellite observed a prominence eruption (coronal mass ejection) on 1997 December 12. Ejected plasma moved at about 130 km s(-1) in the plane of the sky and showed Doppler shifts between -350 and +30 km s(-1). The eruption appeared as a strongly curved arch in EIT images low in the corona. Emission in ions ranging from Si III to O VI in the UVCS spectra indicates a temperature range between 10(4.5) and 10(5.5) K. The morphology of the bright emission regions seen by all three instruments suggests several strands of a helical structure of moderate pitch angle. A reasonable fit to the spatial structure and the velocity evolution measured by UVCS is provided by a left-handed helix untwisting at a rate of about 9 x 10(-4) radians s(-1).

引用

页码：575 / 591

页数：17

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