Is there an acoustic resonance in the solar chromosphere

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/186072· OSTI ID:5261684

Woodard, M F; Libbrecht, K G ^[1]

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1. Big Bear Solar Observatory, Pasadena, CA (USA)

By comparing helioseismology data from 1986, 1988, and 1989, it was found that the frequecy dependence of the frequency perturbation of solar p-modes caused by solar activity drops abruptly for modes of frequency above approximately 3.9 mHz. The drop in the frequency dependence of the frequency shift may result from solar cycle changes in the chromosphere, provided that the chromosphere acts as a cavity in which p-modes are trapped (Goldreich et al.). No evidence is found in the temporal power spectrum of a time series of narrow-band Ca II K-line filtergrams of a resonance which would reveal the existence of a chromospheric cavity. This circumstance constrains the possible physical explanations of the frequency shifts. 11 refs.

• OSTI ID: 5261684
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 374; 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
ALKALINE EARTH METALS
ATMOSPHERES
CALCIUM
CHROMOSPHERE
ELEMENTS
FREQUENCY DEPENDENCE
MAIN SEQUENCE STARS
METALS
OSCILLATION MODES
OSCILLATIONS
RESONANCE
SEISMOLOGY
SOLAR ACTIVITY
SOLAR ATMOSPHERE
STARS
SUN