Search for Long-Period Traveling or Standing Waves in the Magnetosphere Using the BATS-R-US MHD Model

Details Search for Long-Period Traveling or Standing Waves in the Magnetosphere Using the BATS-R-US MHD Model Search for Long-Period Traveling or Standing Waves in the Magnetosphere Using the BATS-R-US MHD Model

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0593f&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0593

Physics

2700 Magnetospheric Physics, 2752 Mhd Waves And Instabilities, 2753 Numerical Modeling

Scientific paper

We have begun a search for long-period waves in the magnetosphere using output from the BATS-R-US MHD model. The search methodology involves a visual study of animations created from model output files taken every 20 seconds. The animations are run at 15 frames per second, fast enough to allow waves to be readily visible. To trigger the waves, our intial investigations use as model input an idealized southward turning of Bz from +5 nT to -5 nT over a 10 minute period followed by a later northward turning of the same magnitude. The preliminary search has focused on the magnetotail. Waves appear to be common in the tail. For example, traveling waves are generated by the disruption of high-latitude merging and transition to lower latitude merging following the southward turning. These waves move tailward throughout the lobes. Waves can also be seen associated with the creation of plasmoids. These waves spread around and ahead of the plasmoid. Animations of these traveling waves will be presented.

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