Chromospheric oscillations observed in the line Ciiλ1336 with OSO-8

✍ Scribed by Eric G. Chipman

• Book ID: 104644693
• Publisher: Springer
• Year: 1977
• Tongue: English
• Weight: 473 KB
• Volume: 55
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00152573

✦ Synopsis

Satellite observations of velocity and intensity oscillations were made of the upper chromospheric line C tt A 1336. 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 -a 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 A 1800 continuum and C t~ A1336 variation of 27 s and 70 s for different cases.