Temporal and spatial fluctuations in strengths and widths of C IV and SI II lines observed with OSO 8
Abstract
The spatial and temporal fluctuations in widths and strengths are examined for three EUV lines: C IV, wavelength 1548 and Si II, wavelengths 1816.93 and 1817.45 observed with an effective aperture of 2 x 20 arcsec and with time resolution less than 30 s. Three classes of fluctuations with substantial amplitude are identified: (1) short term fluctuations with a characteristic fluctuation time near 5 min, (2) intermediate term fluctuations with a characteristic time of 30 min or longer, and (3) large scale spatial fluctuations associated with supergranule cell, network, and plage structure.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1980
- DOI:
- 10.1086/158234
- Bibcode:
- 1980ApJ...240..306A
- Keywords:
-
- Carbon;
- Periodic Variations;
- Silicon;
- Solar Spectra;
- Spectral Energy Distribution;
- Spectral Line Width;
- Ultraviolet Spectra;
- Extreme Ultraviolet Radiation;
- Faculae;
- Oso-8;
- Solar Atmosphere;
- Solar Corona;
- Spectral Resolution;
- Statistical Analysis;
- Stellar Models;
- White Noise;
- Solar Physics