Evidence of outward flow of plasma in a coronal hole

Details Evidence of outward flow of plasma in a coronal hole Evidence of outward flow of plasma in a coronal hole

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207l..61c&link_type=abstract

Astrophysical Journal, vol. 207, July 1, 1976, pt. 2, p. L61, L62.

Astronomy and Astrophysics

Astrophysics

43

Magnetohydrodynamic Flow, Solar Corona, Solar Spectra, Solar Wind Velocity, Doppler Effect, Frequency Shift, Plasma Temperature, Solar Activity Effects

Scientific paper

The solar spectrum was photographed in the range 200-700 A with a grazing-incidence stigmatic rocket spectrograph. Doppler shifts of the three coronal lines Si XI (303 A), Mg X (610 A), and Mg IX (368 A) were measured for various regions of the solar disk, including a coronal hole. From the relative shifts in the latter region, an average outward velocity of 16 km/s was computed for the plasma in the coronal hole. The full widths at half-maximum for the above lines were appreciably less in the coronal-hole region than in a quiet region, indicating a lower temperature in the hole. Both the measured velocity and the temperature results are consistent with solar-wind data and with current theories of coronal holes.

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