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First Year of Observations with SOHO/EIT of the “Quiet” Sun Corona

Published online by Cambridge University Press:  12 April 2016

F. Portier-Fozzani ,
A.J. Maucherat  and
EIT Team
F. Portier-Fozzani
Affiliation:
Laboratoire d’Astronomie Spatiale, CNRS, BP8, 13376 Marseille Cedex 12, France
A.J. Maucherat
Affiliation:
Laboratoire d’Astronomie Spatiale, CNRS, BP8, 13376 Marseille Cedex 12, France
EIT Team
Affiliation:
Laboratoire d’Astronomie Spatiale, CNRS, BP8, 13376 Marseille Cedex 12, France

Abstract

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Since January 1996 (EIT first light) the Extreme Ultraviolet Telescope aboard SOHO has produced about 20,000 wide-field images of the corona and transition regions. Four different emission lines (He II, Fe IX/X, Fe XII, Fe XV) were selected to detail morphologies of magnetic structures in the corona. They show the different structures present in the corona with information about their topologies (Neupert et al. 1998). They provide the global temperature distribution in the quiet corona in the range 0.5 to 3 × 106 K.

The evolution of the corona during the first year of the SOHO mission revealed its nonuniform aspect and the nonregularity of the appearance of new active regions. Changes observed in active regions and coronal holes (e.g., August–September 1996) showed the complex role of magnetic fields including magnetic interactions and possible reconnections needed to explain some loop morphology evolution.

Type
Filaments and Their Environment
Information
International Astronomical Union Colloquium , Volume 167: New Perspectives on Solar Prominences , 1998 , pp. 41 - 44
Copyright
Copyright © Astronomical Society of the Pacific 1998

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