The EUV Spectrum of Sunspot Plumes Observed by SUMER on SOHO

[摘要] We present results from sunspot observations obtained by SUMER on SOHO. In sunspot plumes the EUV spectrum differs from the quiet Sun; continua are observed with different slopes and intensities; emission lines from molecular hydrogen and many unidentified species indicate unique plasma conditions above sunspots. Sunspot plumes are sites of systematic downflow. We also discuss the properties of sunspot oscillations.

[学科分类] 天文学(综合)

[关键词] Sun: EUV spectroscopy;sunspot;oscillation.