The Global Oscillation Network Group (GONG) Project

  title={The Global Oscillation Network Group (GONG) Project},
  author={J. W. Harvey and Frank Hill and Robert P. Hubbard and James R. Kennedy and John Leibacher and James A. Pintar and Peter A. Gilman and Robert W. Noyes and A. M. Title and J. Toomre and Roger K. Ulrich and Arvind Bhatnagar and John A. Kennewell and William M. Marquette and J. Patr{\'o}n and Oscar Sa{\'a} and E. A. Yasukawa},
  pages={1284 - 1286}
Helioseismology requires nearly continuous observations of the oscillations of the solar surface for long periods of time in order to obtain precise measurements of the sun's normal modes of oscillation. The GONG project acquires velocity images from a network of six identical instruments distributed around the world. The GONG network began full operation in October 1995. It has achieved a duty cycle of 89 percent and reduced the magnitude of spectral artifacts by a factor of 280 in power… 

GONG Observations of Solar Surface Flows

Rotation profiles averaged over 27-day rotations of the sun reveal the torsional oscillation signal—weak, jetlike features, with amplitudes of 5 meters per second, that are associated with the sunspot latitude activity belts.

Helioseismic Measurement of Solar Torsional Oscillations

The temporal variations of the Sun's internal rotation from solar p-mode frequencies obtained over nearly 6 years by the Michelson Doppler Imager instrument on board the Solar and Heliospheric Observatory (SOHO) satellite are reported.

GONG Catalog of Solar Filament Oscillations Near Solar Maximum

We have cataloged filament oscillations from the Global Oscillation Network Group Hα network data during several months near the maximum of solar cycle 24 (2014 January–June). Selected examples from

The Global Oscillation Network Group Facility—An Example of Research to Operations in Space Weather

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Helioseismology: Observations and space missions

The great success of Helioseismology resides in the remarkable progress achieved in the understanding of the structure and dynamics of the solar interior. This success mainly relies on the ability to

Solar Interior and Seismology

Helioseismologyis probing the internal structure and dynamics of the Sun with high precision. Frequencies of nearlyhalf a million resonant modes of oscillations have been measured bythe ground based

Global p-mode oscillations throughout the complete solar cycle 23 and the beginning of cycle 24

The parameters of the p-mode oscillations vary with solar activity. Such temporal variations provide insights for the study of the structural and dynamical changes occurring in the Sun's interior

Observational Upper Limits to Low-Degree Solar g-Modes

Observations made by the Michelson Doppler Imager (MDI) and Variability of solar IRradiance and Gravity Oscillations (VIRGO) on the Solar and Heliospheric Observatory (SOHO) and by the ground-based

Duty cycle of doppler ground-based asteroseismic observations

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Taiwan Oscillation Network

The Taiwan Oscillation Network (TON) is a ground-based network to measure solar intensity oscillations to study the internal structure of the Sun. K-line full-disk images of 1000 pixels diameter are

The global oscillation network group site survey

The Global Oscillation Network Group (GONG) Project is planning to place a set of instruments around the world to observe solar oscillations as continuously as possible for at last three years. The

The Solar Acoustic Spectrum and Eigenmode Parameters

The GONG m-averaged frequency measurements differ from other helioseismic data sets by 0.03 to 0.08 microhertz; the differences arise from a combination of systematic errors, random errors, and possible changes in solar structure.

The global oscillation network group site survey

The Global Oscillation Network Group (GONG) Project will place a network of instruments around the world to observe solar oscillations as continuously as possible for three years. The Project has now

The five-minute oscillations as nonradial pulsations of the entire sun.

Calculations of the stability coefficient show that the Sun should be pulsating as a unit in nonradial modes of high order. The pulsations are driven by the superadiabatic gradient of the low

The Solar Oscillations Investigation - Michelson Doppler Imager

The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations.

On the expected performance of a solar oscillation network

We have estimated the performance of several hypothetical ground-based networks intended to provide continuous observations of solar oscillations for one year. These networks were composed of from 2

The Five-Minute Oscillations on the Solar Surface

For readers who were not doing astronomy three decades ago, the contrast between then and now is hard to appreciate. Before the appearance of the epochal papers of Leighton et al. and of Ulrich, no

Seismic Observations of the Solar Interior

The sun is oscillating in an intricate manner. The patterns of motion observed in the solar atmosphere result in part from interference between about 107 resonant modes of oscillation of the

The IRIS network for full disk helioseismology: Present status of the programme

IRIS (International Research on the Interior of the Sun) is the name of a worldwide network of 8 observing stations for full disk helioseismology. The IRIS scientific community is organizing a yearly