Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm22a..02t&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM22A-02
Physics
2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
We investigate the energetics of magnetic storms associated with corotating interaction regions (CIRs). We analyze storms over a solar cycle that are driven by CIRs and compare to those driven by ejecta-related events to determine how they differ in overall properties and in particular in their distribution of energy. To compare these different types of events, we look at events with comparable input parameters such as the epsilon parameter and note the properties of the resulting storms. We estimate the energy output by looking at the ring current energy along with ionospheric Joule heating derived from the PC and Dst indices. We also include the energy of auroral precipitation, estimated from NOAA/TIROS and DMSP observations. In general, ejecta-driven storms produce more intense events, as parameterized by Dst*, but they are usually not as long-lasting, and in most cases deposit less energy. This is observed even for events that have similar input quantities, such as epsilon. This may be related to the high speed of the solar wind, in that an increased magnetosonic Mach number may influence the reconnection rate and therefore the coupling. We also consider differences due to shocks, Bz variability, and to overall kinetic energy flux. We find the efficiency of the coupling varies greatly from CIR-driven to ejecta-driven storms, with the CIR-driven storms coupling substantially more efficiently, particularly in the recovery phase. The efficiency of coupling (output energy divided by input energy) for CIR-driven storms in recovery phase is double that of ejecta-driven storms. We investigate what properties of the CIRs and ejecta events cause these distinct responses in the magnetosphere.
Dwyer Joesph R.
Emery Barbara A.
Knipp Delores J.
Mitchell Elizabeth J.
Turner Niescja Evonne
No associations
LandOfFree
Energy Transfer and Geoeffectiveness in CIR-Driven and Ejecta-Driven Magnetic Storms 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 Energy Transfer and Geoeffectiveness in CIR-Driven and Ejecta-Driven Magnetic Storms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy Transfer and Geoeffectiveness in CIR-Driven and Ejecta-Driven Magnetic Storms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-971017