Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm44a..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM44A-04
Physics
2722 Forecasting (7924, 7964), 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Forecasting when and how often relativistic electrons largely increase at geosynchronous (GEO) orbit is one of the most important issues of the space weather research. Here we show our recent effort to understand the effective solar wind structures associated with the large flux enhancement at GEO. From superposed epoch analyses of last 10 year data set, it is found that the high-speed solar wind associated with coronal hole stream is more effective for the large flux enhancement on average than the high-speed solar wind associated with coronal mass ejections. The large flux enhancement depends not only on the solar wind speed but also on the sector polarity and seasons, i.e., the large flux enhancement tends to occur when the sector polarity meets so-called spring-toward fall-away (STFA) rule. The results showed that intermittent southward interplanetary magnetic field (IMF) embedded within high speed coronal hole stream is essential for a large flux enhancement of the outer belt. A case study for coronal hole stream events showed that continuous hot and sub-relativistic electron injections and enhancement of chorus waves occur when the sector polarity meets the STFA rule, associated with the intermittent southward IMF. These electron injections and wave enhancement are essential for non-adiabatic acceleration of relativistic electrons. Besides these large flux enhancement events, it is important to understand when and how the extremely large flux enhancement takes place at GEO. We show the importance of "double inflation" mechanism that the rarefaction of the solar wind and subsequent magnetosphere inflation play an important role for the extreme events possibly via the diminished drift loss at dayside magnetopause.
Kataoka Ryuho
Miyoshi Yasunobu
No associations
LandOfFree
Effective solar wind structures for large flux enhancement of the outer radiation belt does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effective solar wind structures for large flux enhancement of the outer radiation belt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effective solar wind structures for large flux enhancement of the outer radiation belt will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1098129