The sensitivity of chromospherically induced p- and f-mode frequency shifts to the height of the magnetic canopy

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/169899· OSTI ID:5666751

Evans, D J; Roberts, B ^[1]

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1. Saint Andrews, University (Scotland)

Previous investigations of the effect of a magnetic canopy on the solar p- and f-modes are extended to allow for variations in height of the magnetic canopy. Analytical solutions in the limit of long horizontal wavelength are obtained; the solutions exhibit explicitly the dependence of frequency shifts on magnetic field strength, wavenumber, and canopy height. Frequency shifts are principally due to changes in canopy height. Full numerical solutions are also presented. It is argued that changes in chromospheric magnetism will be manifest in p- and f-mode data sets gathered at different phases of the solar cycle. A comparison of theoretical results obtained here with the recent data obtained by Libbrecht and Woodard (1990) is made. 24 refs.

• OSTI ID: 5666751
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 371; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALYTICAL SOLUTION
ASYMPTOTIC SOLUTIONS
ATMOSPHERES
CHROMOSPHERE
COMPARATIVE EVALUATIONS
HYDROMAGNETIC WAVES
MAGNETIC FIELDS
MAIN SEQUENCE STARS
NUMERICAL SOLUTION
OSCILLATION MODES
OSCILLATIONS
PHOTOSPHERE
SOLAR ATMOSPHERE
SOLAR CYCLE
STARS
SUN