Observational helioseismic projects

Ground-based projects
Type of detector Image resolution

Whole-disk Disk resolution

Doppler

BiSON
Birmingham Solar Oscillation Network (6 sites)

IRIS
(International Research on the Interior of the Sun) (6 sites)

GONG
(Global Oscillation Network Group)(6 sites)

LOWL
(Low - L (degree of mode), 1 site, l=0-100)
HAO, Boulder

HiDHN
(High Degree Helioseismology Network, 2 sites)
USC, Los Angeles

Intensity hardly possible TON

Cosmic projects SOHO, intruments
Type of detector Image resolution

Whole-disk Disk resolution

Doppler GOLF
(Global Oscillations at Low Frequencies)
Institut d'Astrophysique Spatiale, France. SOI/MDI
(Michelson Doppler Imager/Solar Oscillations Investigation)
Stanford University, USA

Intensity VIRGO
(Variability of Solar Irradiance and Gravity Oscillations);
ESTEC SOI/MDI

Type of detector	Image resolution
Type of detector	Whole-disk	Disk resolution
Doppler	GOLF (Global Oscillations at Low Frequencies) Institut d'Astrophysique Spatiale, France.	SOI/MDI (Michelson Doppler Imager/Solar Oscillations Investigation) Stanford University, USA
Intensity	VIRGO (Variability of Solar Irradiance and Gravity Oscillations); ESTEC	SOI/MDI