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Long term variations in the Extreme UV corona: the EIT/SoHO perspective

Published online by Cambridge University Press:  13 May 2016

J-F. Hochedez ,
F. Clette ,
E. Verwichte ,
D. Berghmans  and
P. Cugnon
J-F. Hochedez
Affiliation:
Royal Observatory of Belgium, Solar Physics Department, Circular Avenue 3., B-1180 Brussels Belgium, hochedez@oma.be.sol.oma.be
F. Clette
Affiliation:
Royal Observatory of Belgium, Solar Physics Department, Circular Avenue 3., B-1180 Brussels Belgium, hochedez@oma.be.sol.oma.be
E. Verwichte
Affiliation:
Royal Observatory of Belgium, Solar Physics Department, Circular Avenue 3., B-1180 Brussels Belgium, hochedez@oma.be.sol.oma.be
D. Berghmans
Affiliation:
Royal Observatory of Belgium, Solar Physics Department, Circular Avenue 3., B-1180 Brussels Belgium, hochedez@oma.be.sol.oma.be
P. Cugnon
Affiliation:
Royal Observatory of Belgium, Solar Physics Department, Circular Avenue 3., B-1180 Brussels Belgium, hochedez@oma.be.sol.oma.be

Abstract

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Since the start of the SoHO mission, EIT -the Extreme ultraviolet Imaging Telescope- offers a global view of the solar corona over the whole rising phase of the current activity cycle. Such a dataset is unprecedented. We give here the current results of an on-going investigation over the entire EIT archive. In the Fe XV images (2 MK), the on-disk and off-disk intensity distributions have been evaluated, and their evolution is described. Additionally, we developed an image processing technique that extracts the smallest detectable features. The cosmic ray hits are statistically disentangled from the solar point-like phenomena, and the trends in both rates are assessed.

Type
Session V: Coronal Heating and Solar Wind Acceleration
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 501 - 504
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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