Accession Number:

AD1093106

Title:

Directed Network of Substorms Using SuperMAG Ground Based Magnetometer Data

Personal Author(s):

Corporate Author:

WARWICK UNIV COVENTRY (UNITED KINGDOM) WARWICK United Kingdom

Report Date:

2019-06-25

Abstract:

We quantify the spatiotemporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100 magnetometers. We construct dynamical directed networks from this data for the first time. If the canonical cross-correlation between vector magnetic field perturbations observed at two magnetometer stations exceeds a threshold, they form a network connection. The time lag at which canonical cross-correlation is maximal determines the direction of propagation or expansion of the structure captured by the network connection. If spatial correlation reflects ionospheric current patterns, network properties can test different models for the evolving substorm current system. We select 86 isolated substorms based on nightside ground station coverage. We find, and obtain the timings for, a consistent picture in which the classic substorm current wedge forms. A current system is seen premidnight following the substorm current wedge westward expansion. Later, there is a weaker signal of eastward expansion. Finally, there is evidence of substorm-enhanced convection.

Descriptive Note:

Journal Article - Open Access

Supplementary Note:

Geophysical Research Letters , 46, 12, 01 Jan 0001, 01 Jan 0001,

Pages:

0011

Descriptors:

Identifiers:

Subject Categories:

Communities Of Interest:

Modernization Areas:

Distribution Statement:

Approved For Public Release;

File Size:

1.58MB

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