Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31c..04r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH31C-04
Other
6213 Dust, 7514 Energetic Particles (2114), 7519 Flares, 7524 Magnetic Fields
Scientific paper
The anomalous composition of particles emerging from impulsive solar events is currently modeled by first ionization potential fractionation effects and selective acceleration processes. An alternative explanation will be presented, in which the observed enhancements are due to the injection into the flaring loop region of material brought into the inner heliosphere by interstellar micrometeoroids or microms. The enhancement in heavy elements observed in impulsive solar events demonstrates a clear correlation to the first ionization potential (FIP) of these elements. Therefore, the enhancement in these elements has been related to FIP fractionation effects. Now, it has been noted long ago that FIP and volatility are two characteristics that are very strongly correlated. A low FIP element is also an element with low volatility, or high refractivity, meaning that this element condenses easily and will be found in dust grains and larger solid bodies. This observation, alone, of the fairly close equivalence between low FIP and high refractivity would not be of much significance if it were not suggested by the recent discovery that a large amount of matter, rich in iron and other refractive elements, but also possibly in 3He and Ne, flows towards the Sun. This matter is of interstellar origine, essentially, except for Ne, and is brought into the inner heliosphere by interstellar micrometeoroids (or microms), which are large aggregates of dust grain material, 30 μ m in size and larger. These microms might be the reason for the lack of observed low-metallicity stars (Ragot 2001). They have been detected in the Earth atmosphere with the Advanced Meteor Orbit Radar (Baggaley 2000). We will show that they could be at the origine of the abundance anomalies observed in impulsive solar events.
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