Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..835v&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Other
2
Solar Corona: Mass Ejections, Interplanetary Matter
Scientific paper
The interplanetary counterparts of coronal mass ejections (ICMEs) are complex phenomena that are not recognised or characterised easily. Many signatures have been defined and used to identify them: kinetic, magnetic, thermal, energetic particles, etc., but hardly any ICME event shows a signal in all of them simultaneously. Another classical ICME identifier is the abundance of alpha particles. It was shown that an alpha-to-proton ratio of >8% is a sufficient criterion for ICME detection, albeit not a necessary one. In recent years more composition signatures for ICMEs were defined using the time-of-flight instruments on Ulysses and ACE, and it could be shown that a high average iron charge state is also a sufficient but no necessary ICME signature. The same is probably true for an increased oxygen or carbon freezing in temperature above a certain threshold value. Composition signatures are particularly attractive since they are unlikely to change once the SME has left the Sun, making them a robust tool for ICME identification throughout the entire heliosphere. Using the data obtained with Ulysses SWICS we assess which of the composition signatures are observed in ICMEs defined by the classical signatures. Conversely, we search for occurrences of composition signatures and assess whether or not an ICME is associated with it. As a result we obtain a quality measure for each composition signature.
von Steiger Rudolf
Zurbuchen Thomas H.
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