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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/021/03-04/0397-0401

    • Keywords

       

      Sun: EUV spectroscopy; sunspot; oscillation

    • Abstract

       

      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

    • Author Affiliations

       

      W. Curdt1 B. N. Dwivedi2 U. Feldman3

      1. Max-Planck-Institut fiir Aeronomie, Katlenburg-Lindau - D-37191, Germany
      2. Department of Applied Physics, Banaras Hindu University, Varanasi - 221005, India
      3. E.O. Hulburt Center for Space Research, NRL, Washington DC - 20375, USA
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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