Observational evidence for solar wind acceleration at the base of coronal holes

Details Observational evidence for solar wind acceleration at the base of coronal holes Observational evidence for solar wind acceleration at the base of coronal holes

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nascp.2280.199r&link_type=abstract

In JPL Solar Wind Five p 199-210 (SEE N84-13067 03-92)

Computer Science

Sound

1

Coronal Holes, Doppler Effect, Emission Spectra, Plasma Acceleration, Solar Spectrometers, Solar Wind, Extreme Ultraviolet Radiation, Rocket Sounding, Spectral Signatures, Ultraviolet Spectrometers

Scientific paper

An EUV spectrometer with a microchannel plate detector was developed to measure Doppler shifts of coronal and transition region lines. The results of three sounding rocket fights of this instrument indicate that EUV resonance emission lines are systematically shifted toward shorter wavelength within coronal holes. This "blue-shift" signature, first identified within compact low latitude holes, was also observed in a well developed polar coronal hole. The maximum measured shift within these coronal holes corresponds to a velocity relative to the remaining solar disc of 12 km/s in lambda 625 Mg X T to the approximately 10 to the 6.15 K power and 7 km /s/ in lambda 629 OV (T to the approximately 10 to the 5.4 K power). The existing data indicate that these blue-shifts are a common (and possibly universal) signature of coronal holes. These data provide important information on the acceleration of coronal plasma in open magnetic field regions, although the interpretation of observed Doppler shifts to derive a systematic mass flux is to some extent model dependent. A straightforward hypothesis is that the blueshift signature is a direct manifestation of the high speed solar wind deep within the transition region and inner corona.

Affiliated with

Also associated with

No associations

Rating

Observational evidence for solar wind acceleration at the base of coronal holes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Observational evidence for solar wind acceleration at the base of coronal holes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observational evidence for solar wind acceleration at the base of coronal holes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1487601