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Understanding CMEs and their source regions
Webb, D. F.
CMEs are an important aspect of coronal and interplanetary dynamics. They can eject large amounts of mass and magnetic fields into the heliosphere which can drive large geomagnetic storms and interplanetary shocks, a key source of solar energetic particles. However, our knowledge of the origins and early development of CMEs at the Sun is limited. …
Sigmoid CME source regions at the Sun: some recent results
Sterling, A. C.
Identifying coronal mass ejection (CME) precursors in the solar corona would be an important step in space weather forecasting, as well as a vital key to understanding the physics of CMEs. Twisted magnetic field structures are suspected of being the source of at least some CMEs. These features can appear sigmoid (S or inverse-S) shaped in soft X-r…
Measurements of the solar wind over a wide range of heliocentric distances - a comparison of results from the first three Whole Sun Months
Thompson, B. J.; Biesecker, D. A.; Lazarus, A. J. +9 more
Co-ordinated observations of the Sun and inner heliosphere using a large number of space- and ground-based instruments were carried out in August-September 1996, August 1998 and August-September 1999 as the first, second and third Whole Sun Months. These observations provided unprecedented cover of the Sun and inner heliosphere at solar minimum (1…
Magnetic flux rope ejection: observation at 304Å and comparison with recent models
Delannée, C.
With one example of a coronal mass ejection observed with SOHO//EIT and LASCO we demonstrate the main characteristic of this kind of event: its flux rope nature. These events are commonly responsible for magnetic clouds approaching the Earth. Near the solar surface, the different structures expected during the ejection of a flux rope are observed:…
Solar large-scale emitting chains: some CME-associated events
Chertok, I. M.
Transient large-scale emitting chains and threads, associated with several coronal mass ejections (CMEs), are analyzed by the SOHO//EIT, TRACE, Yohkoh//SXT, Nobeyama Radioheliograph, and some other imaging data. It is illustrated that a pronounced evolution of the chains and threads in the EUV, soft X-ray, microwave, and other ranges can occur man…
Total solar irradiance variations
Fröhlich, C.; Pap, J. M.
Total solar irradiance has been monitored from space for nearly two decades. These space-borne observations have established conclusively that total solar irradiance changes over a wide range of periodicities-from minutes to the 11-year solar cycle. Since the total energy flux of the Sun is the principal driver for all Earths atmospheric phenomena…
Science tools on the Internet-access to information, data and models
Bilitza, D.
In just a few years the Internet has become an essential element in national and international science endeavors. Transfer of data, models, and related software across the net has skyrocketed. Interactive WorldWideWeb modules let the users do everything from simply specifying time periods for data retrieval to plotting complex data sets, to comput…