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EIT: Extreme-ultraviolet Imaging Telescope for the SOHO mission
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…
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Revisiting the Sunspot Number
Our knowledge of the long-term evolution of solar activity and of its primary modulation, the 11-year cycle, largely depends on a single direct observational record: the visual sunspot counts that…
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Revisiting the Sunspot Number A 400-Year Perspective on the Solar Cycle
Our knowledge of the long-term evolution of solar activity and of its primary modulation, the 11-year cycle, largely depends on a single direct observational record: the visual sunspot counts that…
Active region EUV transient brightenings – First Results by EIT of SOHO JOP 80
On 13 May 1998, the Extreme-Ultraviolet Imaging Telescope (EIT, on board SOHO) has produced a unique image sequence operating in 'shutterless mode' (SOHO JOP 80). In JOP 80, EIT is the lead…
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The New Sunspot Number: Assembling All Corrections
Based on various diagnostics and corrections established in the framework of several Sunspot Number Workshops and described by Clette et al. (Space Sci. Rev.186, 35, 2014), we now assembled all…
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Eit Observations of the Extreme Ultraviolet Sun
The Extreme Ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft has been operational since 2 January 1996. EIT observes the Sun over a 45 x 45 arc min field of view in four emission line…
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A Revised Collection of Sunspot Group Numbers
We describe a revised collection of the number of sunspot groups from 1610 to the present. This new collection is based on the work of Hoyt and Schatten (Solar Phys. 179, 189, 1998). The main changes…
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Eit and LASCO Observations of the Initiation of a Coronal Mass Ejection
We present the first observations of the initiation of a coronal mass ejection (CME) seen on the disk of the Sun. Observations with the EIT experiment on SOHO show that the CME began in a small…
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Height correction in the measurement of solar differential rotation determined by coronal bright points
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse solar differential rotation by tracing…
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From the Wolf number to the International Sunspot Index: 25 years of SIDC
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