Influence of a chromospheric magnetic field on the solar p- and f-modes

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/167216· OSTI ID:6286499

Campbell, W R; Roberts, B

The influence of a chromospheric magnetic field on p- and f-mode frequencies is evaluated theoretically for a simple model of the solar plasma, consisting of a polytrope in the solar interior, above which is an isothermal atmosphere. The atmosphere is permeated by a horizontal magnetic field. Frequency changes and shifts in phase factors due to the presence of a magnetic atmosphere are calculated analytically in the long-wavelength limit, and numerically for arbitrary wavelength. The results reveal that, at low to moderate degree l, an increase in chromospheric magnetic field leads to a frequency increase for the n = 1 p-mode, whereas the overtones (n = 2, 3, etc.) suffer a frequency decrease. At high l, all the p-modes suffer a frequency decrease. 35 refs.

• Research Organization: Saint Andrews, University, Scotland
• OSTI ID: 6286499
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 338; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CHROMOSPHERE
HYDROMAGNETIC WAVES
MAGNETIC FIELDS
MAGNETOACOUSTIC WAVES
MAIN SEQUENCE STARS
OSCILLATION MODES
OSCILLATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR WIND
STARS
STARSPOTS
STELLAR ACTIVITY
SUN
SUNSPOTS