Temporal variations of solar-spectral-line profiles induced by the 5-minute photospheric oscillation

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5899357

Gomez, M T; Marmolino, C; Roberti, G; Severino, G

The variations induced by the 5-min photospheric oscillation are simulated on the line profiles. A phase lag of the order of 150/degree/ between temperature and velocity wave perturbations can explain the observed differences between the oscillations of the line flanks at residual intensity levels I/I/sub c/ < 0.7. Such a phase relation in the 5-min oscillation differs from that of the adiabatic case in which the temperature and pressure fluctuations are 90/degrees/ out of phase with respect to the velocity. A simple model of radiative damping in the solar photosphere can produce the required phase lag between temperature and velocity. The granulation can affect differentially the oscillations of the line flanks. This effect, however, does not fit the observed behavior of the flank oscillations.

• Research Organization: Air Force Geophysics Lab., Hanscom AFB, MA (USA)
• OSTI ID: 5899357
• Report Number(s): AD-A-205162/1/XAB; AFGL-TR-89-0050
• Resource Relation: Other Information: Pub. in Astronomy and Astrophysics, Vol. 188, 169-177(1987)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PHOTOSPHERE
OSCILLATIONS
SOLAR GRANULATION
SOLAR RADIATION
SPECTRA
ADIABATIC PROCESSES
ASYMMETRY
DAMPING
SUN
VARIATIONS
VELOCITY
ATMOSPHERES
MAIN SEQUENCE STARS
RADIATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
STARS
STELLAR RADIATION
640104* - Astrophysics &amp; Cosmology- Solar Phenomena