Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1696h&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1696
Physics
2475 Polar Cap Ionosphere, 2704 Auroral Phenomena (2407), 2776 Polar Cap Phenomena, 2790 Substorms
Scientific paper
We have analyzed pseudo breakup events in the aurora using 37 second LBHL Polar/UVI data during the months of November and December 2007 to study the relationship between breakups and pseudo breakups. Historically, the distinction between pseudo breakups, which expand locally, and normal breakups, which expand more globally, has been ill defined. We now present an explicit definition based on MLat expanse and peak auroral power. Often, the aurora will exhibit a series of pseudo breakup events before the commencement of a normal breakup. Sometimes a normal breakup does not occur. We analyze the properties of pseudo breakups and parameters that might make a normal breakup more or less likely to occur after a series of pseudo breakup events. There is no statistical difference in MLat location, peak area, peak power dissipation, and total energy deposition for individual pseudo breakups leading to a normal breakup and those that do not. A normal breakup is likely to occur only during the first 100 minutes of a sequence of pseudo breakups. Pseudo breakup sequences leading to a breakup are much shorter than those not leading to a breakup. However, distributions of total energy (in electron precipitation) for sequences leading and not leading to a normal breakup are the same. Although the physical implications of our results are complicated and unclear, pseudo breakup events should be incorporated in any magnetospheric substorm model.
Fillingim Matthew O.
Higgins Paul A.
Parks George K.
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