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The Large Angle Spectroscopic Coronagraph (LASCO)
Llebaria, A.; Michels, D. J.; Koomen, M. J. +12 more
The Large Angle Spectroscopic Coronagraph (LASCO) is a three coronagraph package which has been jointly developed for the Solar and Heliospheric Observatory (SOHO) mission by the Naval Research Laboratory (USA), the Laboratoire d'Astronomie Spatiale (France), the Max-Planck-Institut für Aeronomie (Germany), and the University of Birmingham (UK). L…
The Solar Oscillations Investigation - Michelson Doppler Imager
Kosovichev, A. G.; Hoeksema, J. T.; Scherrer, P. H. +10 more
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. Characteristics of the modes reveal the static and dynamic properties of the convection zone and core. Knowledge of these properties will improve our unde…
EIT: Extreme-Ultraviolet Imaging Telescope for the SOHO Mission
Michels, D. J.; Gurman, J. B.; Delaboudinière, J. -P. +25 more
The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R⊙ above the solar limb. Its normal incidence multilayer-coated optics will select spectral emission lines from Fe IX (171 å), Fe XII (195 å), Fe XV (284 å), and He II (304 å) to provide sensitive tempe…
The SOHO Mission: an Overview
Domingo, V.; Fleck, B.; Poland, A. I.
The Solar and Heliospheric Observatory (SOHO) is a space mission that forms part of the Solar-Terrestrial Science Program (STSP), developed in a collaborative effort by the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA). The STSP constitutes the first "cornerstone" of ESA's long-term programme known as "Sp…
SUMER - Solar Ultraviolet Measurements of Emitted Radiation
Vial, J. -C.; Grewing, M.; Wilhelm, K. +13 more
The instrument SUMER - Solar Ultraviolet Measurements of Emitted Radiation is designed to investigate structures and associated dynamical processes occurring in the solar atmosphere, from the chromosphere through the transition region to the inner corona, over a temperature range from 104 to 2 × 106K and above. These observat…
The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory
Mason, H. E.; Harrison, R. A.; Fludra, A. +36 more
The Coronal Diagnostic Spectrometer is designed to probe the solar atmosphere through the detection of spectral emission lines in the extreme ultraviolet wavelength range 150 - 800 å. By observing the intensities of selected lines and line profiles, we may derive temperature, density, flow and abundance information for the plasmas in the solar atm…
The Ultraviolet Coronagraph Spectrometer for the Solar and Heliospheric Observatory
Livi, S.; Romoli, M.; Geiss, J. +37 more
The SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) is composed of three reflecting telescopes with external and internal occultation and a spectrometer assembly consisting of two toric grating spectrometers and a visible light polarimeter. The purpose of the UVCS instrument is to provide a body of data that can be used to address a broad ra…
VIRGO: Experiment for Helioseismology and Solar Irradiance Monitoring
Gough, Douglas; Chevalier, André; Domingo, Vicente +22 more
The scientific objective of the VIRGO experiment (Variability of solar IRradiance and Gravity Oscillations) is to determine the characteristics of pressure and internal gravity oscillations by observing irradiance and radiance variations, to measure the solar total and spectral irradiance and to quantify their variability over periods of days to t…
Global Oscillations at Low Frequency from the SOHO Mission (GOLF)
Damé, L.; García, R. A.; Pallé, P. L. +28 more
The GOLF experiment on the SOHO mission aims to study the internal structure of the sun by measuring the spectrum of global oscillations in the frequency range 10−7 to 10−2 Hz. Bothp andg mode oscillations will be investigated, with the emphasis on the low order long period waves which penetrate the solar core. The instrument…
CELIAS - Charge, Element and Isotope Analysis System for SOHO
Livi, S.; Hsieh, K. C.; Wurz, P. +30 more
The CELIAS experiment on SOHO is designed to measure the mass, ionic charge and energy of the low and high speed solar wind, of suprathermal ions, and of low energy flare particles. Through analysis of the elemental and isotopic abundances, the ionic charge state, and the velocity distributions of ions originating in the solar atmosphere, the inve…