Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.93k&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
Jet-like events are observed on different scales in the solar corona in EUV and X-rays. They range from gigantic coronal X-ray jets greater than 300 Mm in length to small but numerous jetlets. Polar coronal holes show a significant activity manifested in small loop brightenings and jetlet formation. Geometrical shape of the jetlets and their position indicate that they appear near the singular points of the magnetic field, namely, null points or X-points. These nulls arise due to the interaction between new emerging small dipoles and large-scale magnetic field of the coronal hole. The jetlets reveal some real observable vertical mass motion inside the coronal hole. It is difficult to measure the radial velocity of plasma within the jetlets but it seems large enough to significantly contribute as a large momentum into the solar wind. Finally jetlets could serve as injectors to the process of the solar fast wind acceleration. We believe that similar but even smaller processes could very often happen at smaller scale in the chromosphere near emerging magnetic ephemeral regions forming numerous jetlets of the upper chromosphere. They form the upper chromosphere and follow the direction of the surrounding magnetic field. At the epoch of low activity, the difference in the large-scale structure of the polar magnetic field and that of the low latitude quiet region magnetic field results in a prolateness of the chromosphere.
Filippov Boris
Golub Leon
Koutchmy Serge
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