Chromospheric oscillations observed in the line C II λ1336 with OSO-8
Abstract
Satellite observations of velocity and intensity oscillations were made of the upper chromospheric line C II λ1336. The dominant period of oscillation is 300 s, with little evidence of the power peak in the range 150-200 s which has been observed in other chromospheric lines. Peak-to-peak amplitudes are 2 km s−1 and 8% in velocity and intensity, respectively. Tentative evidence for 900-s periodicity is presented. Relative phase measurements show that maximum intensity for the 300-s oscillation leads maximum blueshift by approximately 145 s. Comparison of line and background (scattered light) intensity variation shows upward wave propagation, with time delays between the λ1800 continuum and C II λ1336 variation of 27 s and 70 s for different cases.
- Publication:
-
Solar Physics
- Pub Date:
- December 1977
- DOI:
- 10.1007/BF00152573
- Bibcode:
- 1977SoPh...55..277C
- Keywords:
-
- Carbon;
- Chromosphere;
- Plasma Oscillations;
- Power Spectra;
- Satellite Observation;
- Solar Spectra;
- Atomic Spectra;
- Ionic Waves;
- Light Scattering;
- Line Shape;
- Molecular Ions;
- Oso-8;
- Periodic Variations;
- Plasma Radiation;
- Plasma Spectra;
- Solar Atmosphere;
- Time Lag;
- Solar Physics;
- Wave Propagation;
- Scattered Light;
- Maximum Intensity;
- Relative Phase;
- Power Peak;
- Extreme UV:Solar Chromosphere;
- Oscillations:Solar Chromosphere;
- Solar Flares: Acoustic Waves