HRTS observations of the solar chromosphere and transition zone.
Abstract
The NRL High Resolution Telescope and Spectrograph (HRTS) consists of a 30 cm Cassegrain telescope which focuses an image of the sun with 1 arcsec resolution, a stigmatic tandem-Wadsworth mount UV spectrograph, a UV broadband spectroheliograph and H-alpha film and video cameras. Images of the UV line and continuum intensities show that they are all strongly associated with the chromospheric network, with an almost one-to-one correspondence found between Fe II intensity images and H-alpha -0.6 A spectroheliograms. The region of C IV emission occurs above the chromospheric mottles at a height of 3900 km when the continuum height is placed at 500 km; significant C IV transition-zone emission was also found at the base of the network elements. C IV profiles are generally near Gaussian, with dimensions on the order of 200 km. Time series and velocity field data are provided, and it is concluded that a steady state heating mechanism is present in the chromosphere.
- Publication:
-
Chromospheric Diagnostics and Modelling
- Pub Date:
- 1985
- Bibcode:
- 1985cdm..proc...50D
- Keywords:
-
- Chromosphere;
- High Resolution;
- Solar Atmosphere;
- Spectroheliographs;
- Telescopes;
- Transition Points;
- Spectral Resolution;
- Spectrum Analysis;
- Ultraviolet Spectra;
- Solar Physics;
- Solar Chromosphere:Solar Telescopes;
- Solar Chromosphere:UV Radiation;
- Solar Telescopes:Solar Chromosphere;
- UV Radiation:Solar Chromosphere