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The proceedings of the 2nd SOHO Workshop published in this volume provide a concise overview of the most relevant aspects of mass supply and flows in the solar corona, focusing on: fine scale structures; loops and prominences; streamers; and coronal holes and solar wind. Each topic is introduced by three reviews - the first giving a summary of the status of relevant observations, the second illustrating the status of related theoretical work, and the third summarizing advances in the field to be expected as a result of future SOHO observations. The book also includes a number of specialized contributions. This volume aims to create a general awareness of the opportunities offered by SOHO, in addition to providing a basis for developing collaborative projects. It should also provide scientists already active in the field with easy access to information about future SOHO activities, while young researchers can learn about those topics which are currently regarded as being most relevant in this rapidly evolving discipline.
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The aim of the VIRGO investigation (Variability of solar IRradiance and Gravity Oscillations) on SOHO (SOlar and Heliospheric Observatory) 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 the duration of the mission. VIRGO contains two different active-cavity radiometers for monitoring the sol- ar 'constant' (DIARAD and PM06-V), two three-channel sunphotometers (SPM) for the measurement of the spectral irradiance at 402, 500, and 862 nm with a bandwidth of 5 nm, and a low-resolution imager (Luminosity Oscillation Imager, LOI) with 12 'scientific' and 4 guiding pixels, for measuring the radiance dis- tribution over the solar disk: at 500 nm. The instrumentation has been described in detail by Frohlich et al. (1995). In addition, the observed in-flight performance and operational aspects of the irradiance observations are described by Frohlich et al. (1997), and those of the LOI by Appourchaux et al. (1997).