Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines

Details Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442...97e&link_type=abstract

In NASA. Goddard Space Flight Center, Coronal and Prominence Plasmas p 97-107 (SEE N87-20871 13-92)

Physics

Solar Prominences, Solar Spectra, Solar Temperature, Sun, Hydrogen, Infrared Radiation, Solar Physics, Solar Spectrometers, Temperature Measurement

Scientific paper

During 12 to 17 September 1983 a number of prominences were observed with the McMatch solar telescope of National Solar Observatories, using the Fourier transform spectrometer with a InSb detector (Brault 1979). The present study refers to three prominences observed 13 and 14 September. Prominence A: Large quiescent prominence at S28 E90 Prominence B. Stable prominence in weakly enhanced magnetic region at about NO8 E90 Prominence C: Quiescent prominence at N30 E90. Spectra were obtained at a total of 15 different locations in the three prominences in the wavelength range lambda, lambda 7740 to 14,000 Angstroms. The observed differences between Texc and Tkin are hardly significant. Researchers conclude that the two methods for temperature determination when applied to optically thin lines give reasonably consistent results, i.e., the population of the excited levels of hydrogen is collisionally controlled. The well known increase in T and V towards the edge of equiescent prominences (Hirayama 1964) is not corroborated by the present data. One explanation for this could be that prominence A is atypical. The optical thickness of prominence emission lines tends to increase from center to edges as demonstrated by the case of He I lambda 10830 angstroms. If line opacity plays a significant role in earlier center to edge determinations of T and V, a smaller variation would be expected from measurements in optically thin lines, such as in the present case.

Affiliated with

Also associated with

No associations

Rating

Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines 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 Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperatures of quiescent prominences measured from hydrogen Paschen and CaII IR lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1126771