Diagnosis of Optical Signatures of the Substorm Growth Phase With Global Ultraviolet Auroral Images From Polar

Details Diagnosis of Optical Signatures of the Substorm Growth Phase With Global Ultraviolet Auroral Images From Polar Diagnosis of Optical Signatures of the Substorm Growth Phase With Global Ultraviolet Auroral Images From Polar

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm41c..02m&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM41C-02

Physics

2704 Auroral Phenomena (2407), 2788 Storms And Substorms, 2455 Particle Precipitation

Scientific paper

The concept of substorm growth phase was first introduced three decades ago but is still hotly debated. Conceptually, the substorm growth phase is defined as a time period in which energy is extracted from the solar wind and stored in the magnetotail before the substorm onset. However, known signatures that can be related to the growth phase are not always nor uniquely observed -- leading to a question whether or not a growth phase for substorm is necessary. In this study we address this question by examining global auroral images acquired from the Polar Ultraviolet Imager (UVI) and comparing results with ground-based Meridian Scanning Photometer (MSP) data. The main goal is to find identifiable auroral features of global aspects for substorm growth phase. Specifically, the well-known growth phase optical signature, equatorward expansion of the oval, primarily reported based on MSP observations, will be thoroughly investigated. Our preliminary results, based on a comparison of a number of isolated substorm events observed by MSP and by Polar UVI, strongly indicate that identification of the substorm growth phase based on the spatially limited MSP technique can sometimes be misleading. Detailed results will be presented and discussed.

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