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First results from VIRGO on SoHO

Published online by Cambridge University Press:  25 May 2016

C. Fröhlich ,
B.N. Andersen ,
T. Appourchaux ,
G. Berthomieu ,
D.A. Crommelynck ,
V. Domingo ,
A. Fichot ,
W. Finsterle ,
M.F. Gómez  and
D. Gough
...Show all authors
C. Fröhlich
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos World Radiation Center, CH-7260 Davos Dorf
B.N. Andersen
Affiliation:
Norwegian Space Centre, N-0309 Oslo 3
T. Appourchaux
Affiliation:
Space Science Department, ESTEC, NL-2200 AG Noordwijk
G. Berthomieu
Affiliation:
Departement Cassini, URA CNRS 1362, Observatoire de la Cote d'Azur, F-06304 Nice Cedex 4
D.A. Crommelynck
Affiliation:
Institut Royal Météorologique de Belgique, B-1180 Bruxelles
V. Domingo
Affiliation:
Space Science Department, ESTEC, NL-2200 AG Noordwijk
A. Fichot
Affiliation:
Institut Royal Météorologique de Belgique, B-1180 Bruxelles
W. Finsterle
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos World Radiation Center, CH-7260 Davos Dorf
M.F. Gómez
Affiliation:
Instituto de Astrofísica de Canarias, Universidad de La Laguna, E-38071 La Laguna, Tenerife
D. Gough
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 9EW, UK
A. Jiménez
Affiliation:
Instituto de Astrofísica de Canarias, Universidad de La Laguna, E-38071 La Laguna, Tenerife
T. Leifsen
Affiliation:
Institute of Theoreretical Astrophysics, University of Oslo, N-0315 Oslo
M. Lombaerts
Affiliation:
Institut Royal Météorologique de Belgique, B-1180 Bruxelles
J.M. Pap
Affiliation:
Department of Physics and Astronomy, Division of Astronomy and Astrophysics, University of California, Los Angeles, CA90095-1562 U.S.A. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 U.S.A.
J. Provost
Affiliation:
Departement Cassini, URA CNRS 1362, Observatoire de la Cote d'Azur, F-06304 Nice Cedex 4
T. Roca Cortés
Affiliation:
Instituto de Astrofísica de Canarias, Universidad de La Laguna, E-38071 La Laguna, Tenerife
J. Romero
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos World Radiation Center, CH-7260 Davos Dorf
H-J. Roth
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos World Radiation Center, CH-7260 Davos Dorf
T. Sekii
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK
U. Telljohann
Affiliation:
Space Science Department, ESTEC, NL-2200 AG Noordwijk
T. Toutain
Affiliation:
Departement Cassini, URA CNRS 1362, Observatoire de la Cote d'Azur, F-06304 Nice Cedex 4
C. Wehrli
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos World Radiation Center, CH-7260 Davos Dorf

Abstract

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First results from the 4-6 months observations of the VIRGO experiment (Variability of solar IRradiance and Gravity Oscillations) on the ESA/NASA Mission SOHO (Solar and Heliospheric Observatory) are reported. The time series are evaluated in terms of solar irradiance variability, solar background noise characteristics and p-mode oscillations. The solar irradiance is modulated by the passage of active regions across the disk, but not all of the modulation is straightforwardly explained in terms of sunspot flux blocking and facular enhancement. The observed p-mode frequencies are more-or-less in agreement with earlier measurements, but it is interesting to note that systematic differences seem to exist between the observations in different colours. There is also evidence that magnetic activity plays a significant role in the dynamics of the oscillations beyond its modulation of the resonant frequencies. Moreover, by comparing the amplitudes of different components of p-mode multiplets, each of which are influenced differently by spatial inhomogeneity, we have found that activity enhances excitation.

Type
Part I: Helioseismology: From ground or space, a worldwide cooperation
Information
Symposium - International Astronomical Union , Volume 181: Sounding Solar and Stellar Interiors , 1997 , pp. 67 - 82
Copyright
Copyright © Kluwer 1997 

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