Variability of the Earth's Quasi-perpendicular Bow Shock: Temporal and Spatial Scales

Details Variability of the Earth's Quasi-perpendicular Bow Shock: Temporal and Spatial Scales Variability of the Earth's Quasi-perpendicular Bow Shock: Temporal and Spatial Scales

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1615h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1615

Physics

2154 Planetary Bow Shocks, 7851 Shock Waves (4455)

Scientific paper

Using 41 crossings of the Earth's quasi-perpendicular bow shock by the four Cluster satellites, we investigate the variability of the shock, seeking to discover if this variability has characteristic temporal and spatial scales. At each shock, and for each spacecraft, magnetic field measurements, centred on the shock encounter time, are used to create a shock variability profile. This is defined as the difference between a spacecraft's individual shock profile and the shock profile averaged over all four spacecraft. Cross- correlating these variability profiles between pairs of spacecraft, we investigate the dependence of the maximum cross-correlation coefficient on the temporal and spatial separation of the spacecraft. These are defined respectively as the time between shock encounters and the separation along the shock front in the Normal Incidence Frame, found using upstream solar wind velocity measurements. We demonstrate that the profiles decorrelate in both space and time, and investigate how the scales of this decorrelation vary with shock control parameters such as MA and θBn. To investigate the physical mechanism associated with the variability, this analysis is also performed normalising the temporal and spatial separations by various time and length scales previously associated with the shock, such as the ion gyroperiod and ion inertial length.

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