Direct observations of blob deformation during a substorm

Ishida, T.; Ogawa, Y.; Kadokura, A.; Hosokawa, K.; Otsuka, Y.

Ionospheric blobs are localized plasma density enhancements, which are mainly produced by the transportation process of plasma. To understand the deformation process of a blob, observations of plasma parameters with good spatial–temporal resolution are desirable. Thus, we conducted the European Incoherent Scatter radar observations with high-speed meridional scans (60–80 s) during October and December 2013, and observed the temporal evolution of a blob during a substorm on 4 December 2013. This paper is the first report of direct observations of blob deformation during a substorm. The blob deformation arose from an enhanced plasma flow shear during the substorm expansion phase, and then the blob split into two smaller-scale blobs, whose scale sizes were more than ~100 km in latitude. Our analysis indicates that the Kelvin–Helmholtz instability and dissociative recombination could have deformed the blob structure.

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Ishida, T. / Ogawa, Y. / Kadokura, A. / et al: Direct observations of blob deformation during a substorm. 2015. Copernicus Publications.

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