• Ultraviolet Spectroscopic Observations of Coronal Streamers in the SOHO Era

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      https://www.ias.ac.in/article/fulltext/joaa/029/01-02/0167-0170

    • Keywords

       

      Sun; corona; ultraviolet.

    • Abstract

       

      Measurements made with the Ultraviolet Coronagraph Spectrometer (UVCS) on the Solar and Heliospheric Observatory can be used to determine physical parameters in the solar corona such as hydrogen and ion kinetic temperatures, electron densities, and absolute elemental abundances. Hydrogen and ion outflow velocities can be determined by combining the UV spectroscopic measurements with white light polarized brightness measurements. These combined measurements can be used to reveal physical characteristics of coronal streamers. To date we have studied plasma properties, such as the variation of plasma outflows in quiescent streamers, primarily in classic helmet streamers at solar minimum. Outflows have not been observed in the centers of coronal streamers suggesting that these are closed magnetic field regions.We propose to study all of the coronal streamers in the UVCS synoptic dataset in order to investigate different types of streamers and their long-term evolution.

    • Author Affiliations

       

      Leonard Strachan1

      1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA.
    • Dates

       
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