Low degree p-modes observed in velocity and brightness Future in the frame of the space-ground competition

Details Low degree p-modes observed in velocity and brightness Future in the frame of the space-ground competition Low degree p-modes observed in velocity and brightness Future in the frame of the space-ground competition

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55...47f&link_type=abstract

(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations

Astronomy and Astrophysics

Astronomy

1

Helioseismology, Solar Oscillations, Vibration Mode, Astronomical Photometry, Brightness, Doppler Effect, Power Spectra, Scintillation, Stellar Oscillations, Time Series Analysis

Scientific paper

Observational data on low-degree p-mode solar oscillations are summarized, and observational techniques to provide further information are discussed in detail. The specific advantages of full-disk, center/outer-annulus, and two-dimensional-imaging observations are indicated; the need for longer time series to determine the lifetimes of amplitude and phase modes, their frequency variation, the fine structure of individual power-spectrum peaks, and the nature of the 160-min oscillation is stressed; stellar p-modes are considered; and the sources of noise in ground-based and spaceborne observations (photon noise, telescope guiding, apparatus instability, scintillation, and transparency changes) are examined. It is found that both solar and stellar Doppler-signal observations are already photon-noise-limited from the ground, but the quality of solar-brightness measurements and broadband photometry of stars can be greatly improved from space.

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