Measurement of systematic outflow from the solar transition region underlying a coronal hole

Computer Science – Sound

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Coronal Holes, Doppler Effect, Solar Atmosphere, Solar Corona, Solar Spectra, Solar Wind Velocity, Oxygen Spectra, Radial Velocity, Red Shift, Rocket Sounding, Silicon, Solar Spectrometers, Spectrum Analysis

Scientific paper

This letter presents measurements of small Doppler shifts in the line center position of 629A OV obtained with a new high-resolution EUV spectrometer flown aboard a sounding rocket. A major result is the detection of an apparent systematic outflow (relative to the quiet sun) of approximately 3 km/s average and 5 km/s maximum in the solar transition region underlying a well-defined low-latitude coronal hole. This is reminiscent of a similar apparent outflow observed by Cushman and Rense in the coronal line 303A Si XI. The hypothesis that this is evidence for acceleration of the high speed solar wind deep in the transition region and inner corona is explored briefly.

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