Search Publications
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…
Energetic Particle Experiment ERNE
Valtonen, E.; Peltonen, P.; Eronen, T. +12 more
The Energetic and Relativistic Nuclei and Electron (ERNE) experiment will investigate the solar atmosphere and the heliosphere by detecting particles produced in various kinds of energy release processes. ERNE is at the upper end in energy among the SOHO particle instruments. The instrument will measure the energy spectra of elements in the range …
COSTEP - Comprehensive Suprathermal and Energetic Particle Analyser
Sierks, H.; Kunow, H.; Müller-Mellin, R. +16 more
The COSTEP experiment on SOHO forms part of the CEPAC complex of instruments that will perform studies of the suprathermal and energetic particle populations of solar, interplanetary, and galactic origin. Specifically, the LION and EPHIN instruments are designed to use particle emissions from the Sun for several species (electrons, protons, and he…
SWAN: A Study of Solar Wind Anisotropies on SOHO with Lyman Alpha Sky Mapping
Schmidt, W.; Dimarellis, E.; Torsti, J. +22 more
On board the SOHO spacecraft poised at L1 Lagrange point, the SWAN instrument is mainly devoted to the measurement of large scale structures of the solar wind, and in particular the distribution with heliographic latitude of the solar wind mass flux. This is obtained from an intensity map of the sky Lymanα emission, which reflects the shape of the…
Numerical Modeling of Coronal Mass Ejections Based on Various Pre-Event Model Atmospheres
Wu, S. T.; Poletto, G.; Suess, S. T. +1 more
We examine how the initial state (pre-event corona) affects the numerical MHD simulation for a coronal mass ejection (CME). Earlier simulations based on a pre-event corona with a homogeneous density and temperature distribution at the lower boundary (i.e., solar surface) have been used to analyze the role of streamer properties in determining the …
SOHO Ground Segment, Science Operations, and Data Products
St. Cyr, O. C.; Gurman, J. B.; Martens, P. C. H. +2 more
We describe the ground segment, pre-launch operations concepts, and data products supporting the SOHO mission. Our goal is threefold: first, we provide a historical view of the design and development of the systems described here, as a background perspective to those who will use the system and those who may build such systems for future missions.…
Variable Stars with the HIPPARCOS Satellite
Eyer, L.; Mignard, F.; Grenon, M. +2 more
We present the photometric results of Hipparcos satellite for the first 1.5 year of the mission. For this period, the satellite gave numerous (20 to 120) photometric measurements of 120000 stars. More precisely, we describe: the precision, the capability to find periods with respect to the specific sampling of the satellite (based on simulated dat…
The 1986FEB Solar Activity - a Comparison of Giotto VEGA-1 and IMP-8 Soalr Wind Measurements with Magnetohydrodynamic Simulations
Coates, A. J.; Dryer, M.; Johnstone, A. D. +1 more
Large disturbances in the interplanetary medium were observed by several spacecraft during a period of enhanced solar activity in early February 1986. The locations of six solar flares and the spacecraft considered here encompassed more than 100° of heliolongitude. These flares during the minimum of cycle 21 set the stage for an extensive multi-sp…