Abstract Intensities and profiles of ion emission lines between 1170 A and 1700 A from an active region on the Sun are measured from spectra obtained with the Naval Research Laboratory's High Resolution Telescope and Spectrograph - HRTS. The measurements provide simultaneous determination of line intensities, wavelength shifts and Doppler widths at 50 separate positions in the active region, with spatial resolution of 1 arc second and spectral resolution 0.07 A. Fine structure variation of intensities and gas flow velocities in the temperature range 20,000–200,000 K are determined. The density sensitive line pair I(1486 N IV)/I(1548 C IV) has been used to measure electron pressures. Derived emission measures imply filling factors of 0.05–0.1 to balance the divergence of conductive flux width radiative losses above 60,000 K.
The chromosphere-corona transition zone above an active region
Advances in Space Research ; 4 , 8 ; 63-66
1985-01-01
4 pages
Article (Journal)
Electronic Resource
English
Structure of the chromosphere-corona transition region
NTRS | 1971
|British Library Conference Proceedings | 2005
|Composition of the solar chromosphere and transition region
Online Contents | 2002
|Wave Propagation in the Chromosphere and Transition Region
British Library Online Contents | 1997
|