Evidence of plasmoid ejection in the corona from 1991 eclipse observations with the Canada-France-Hawaii telescope

Details Evidence of plasmoid ejection in the corona from 1991 eclipse observations with the Canada-France-Hawaii telescope Evidence of plasmoid ejection in the corona from 1991 eclipse observations with the Canada-France-Hawaii telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.344...87v&link_type=abstract

In ESA, Solar Physics and Astrophysics at Interferometric Resolution p 87-90 (SEE N93-10901 01-90)

Astronomy and Astrophysics

Astrophysics

4

Fine Structure, Solar Corona, Solar Eclipses, Solar Wind, Stellar Mass Ejection, Telescopes, Emission Spectra, High Resolution, Paschen Series, Thomson Scattering

Scientific paper

Observations of the solar corona with a large telescope at high altitude was fully exploited with the 3.60 m CFHT (Canada France Hawaii Telescope) in Hawaii, during the 11 Jul. 1991 eclipse, are reported. Different instruments set up for the eclipse and preliminary results are given. The moving feature in the corona is focused upon. Physical conditions in this plasmoid and its origins are discussed. One of the four cameras installed in the primary focus was a video charge coupled device camera with a red filter at 637 nm selecting the red line. The power of the telescope allowed for a good signal in a pixel as small as 0.12 arcsec and a very good time resolution. The spectral resolution as measured at the Moon limb was better than one arcsec. During the three minute long sequence, 6000 video images were obtained. Among the fine structures recorded, a plasmoid about 1500 km wide was seen to ascend and dilute in the corona. Possible emission mechanisms are discussed. It was found that both low and relatively high temperature plasmas can be confined in this ejected plasmoid. Such a small scale phenomenon could be important for the heating of the corona and should be observed in UV emission lines in a wide range of temperatures. The high spatial resolution achieved by Solar Interferometric Mission for Ultrahigh Resolution Imaging and Spectroscopy (SIMURIS) allows to study the shape, stability and the diagnostics of such plasmoids in the corona.

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