Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1571t&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1571
Other
2102 Corotating Streams, 2109 Discontinuities (7811), 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 7851 Shock Waves (4455)
Scientific paper
A magnetic decrease (MD) structure exhibits the localized depression in the intensity of the interplanetary magnetic field, which is often identified in the region close to the rear edge of a corotating interaction regions (CIRs). In recent MHD simulations, we have investigated the numerical model for the MD formation process: When the Alfvenic field fluctuation embedded in the fast solar wind is carried into the CIR through the reverse shock, it disintegrates into two Alfven modes traveling in opposite directions in a plasma-rest frame. In the region sandwiched by these modes, the field intensity is reduced that results in the MD formation. This physical mechanism is simply accounted for as follows. Amplification through the reverse shock makes a local pulse-like structure in a monotonic component of the fluctuation field. It leads to the formation of a current reversal structure which violates the force balance. The resultant net force sweeps the plasma backward to form a pressure increase and simultaneous magnetic decrease due to the diamagnetic effect. The opposite edge of this structure, associated with the MD, affords another diamagnetic current, which becomes the source for a reverse Alfven mode at the trailing edge of the MD. In this way, these two Alfven modes (or associated current structures) constitute the MD boundaries. On the other hand, one prominent feature of the MD is a large temperature anisotropy T⊥/T∥ > 1 associated with the mirror instability, so that the MD mechanism should be referred to in terms of kinetic processes. In this paper, we further perform a hybrid simulation and will show the kinetic manifestation of the evolution of Alfvenic fluctuation within the CIR as cited above. The anisotropy generation and other kinetic properties are also discussed in order to elucidate the MD energetics.
No associations
LandOfFree
Kinetic Behavior in the Formation Process of Magnetic Decrease Structures Within the Corotating Interaction Regions 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 Kinetic Behavior in the Formation Process of Magnetic Decrease Structures Within the Corotating Interaction Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinetic Behavior in the Formation Process of Magnetic Decrease Structures Within the Corotating Interaction Regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1246820