Low degree p-modes observed in velocity and brightness Future in the frame of the space-ground competition
Abstract
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.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- June 1984
- Bibcode:
- 1984MmSAI..55...47F
- Keywords:
-
- Helioseismology;
- Solar Oscillations;
- Vibration Mode;
- Astronomical Photometry;
- Brightness;
- Doppler Effect;
- Power Spectra;
- Scintillation;
- Stellar Oscillations;
- Time Series Analysis;
- Solar Physics