On radiative dissipation of sinusoidal compressive waves in the chromosphere

✍ Scribed by R. G. Giovanelli

• Book ID: 104646418
• Publisher: Springer
• Year: 1979
• Tongue: English
• Weight: 697 KB
• Volume: 62
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00155357

✦ Synopsis

A first-order theory is developed for the radiative dissipation of compressive waves in the chromosphere above Tmin, where line radiation becomes dominant. The radiative relaxation time, which is the key to dissipation, is shown to depend on wave amplitude, falling greatly for amplitudes ~> 2 km s -1 or more. For a given amplitude, dissipation is greatest for high frequencies, w ~> 0.1 s -1, periods ~< 1 min. The observed short-period r.m.s, velocities ~2.4kms -1 at the D1 level are adequate to provide dissipation balancing chromospheric emission losses.

Predictions for the temperature-velocity phase difference and the phase velocity are compatible with observations.