High resolution EUV structure of the chromosphere-corona transition region above a sunspot

Details High resolution EUV structure of the chromosphere-corona transition region above a sunspot High resolution EUV structure of the chromosphere-corona transition region above a sunspot

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..253n&link_type=abstract

Solar Physics, vol. 81, Dec. 1982, p. 253-280.

Physics

50

Chromosphere, Extreme Ultraviolet Radiation, Solar Corona, Solar Spectra, Sunspots, Doppler Effect, Electron Pressure, Emission Spectra, Magnetohydrodynamic Flow, Radiative Transfer, Rocket-Borne Instruments, Solar Instruments, Solar Temperature, Spectral Line Width, Ultraviolet Spectra, Umbras

Scientific paper

Rocket observations are reported for a sunspot at high spatial and spectral resolution in the extreme ultraviolet region (EUV) between 1170 and 1715 A. The instrument and data reduction are described, and the appearance of the sunspot features in EUV emission lines is presented together with a correlation of the nonthermal velocity field with the Doppler velocity field. For sunspots the shape of the differential emission measure curve shows that the minimum is shifted to lower temperatures by over a factor of two, while the slope on a log-log scale near log of effective temperature equal to 5.3 is increased by a factor of two. This means that the energy balance is dominated by radiative losses from the large amount of transition region plasma, and an upper limit of a million K exists on the extrapolated temperature above the umbra. Static energy balance models of the umbra show that the observed enthalpy flux can balance radiative losses above 30,000 K for a fill factor greater than 0.1. An umbral model is compared with the chromospheric sunspot model of Kneer and Mattig (1978).

Affiliated with

Also associated with

No associations

Rating

High resolution EUV structure of the chromosphere-corona transition region above a sunspot 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 High resolution EUV structure of the chromosphere-corona transition region above a sunspot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High resolution EUV structure of the chromosphere-corona transition region above a sunspot will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-931967