Diagnosis of Magnetotail Drivers for Ionospheric Electrodynamics Using Networks of Ground-based Magnetometers

Details Diagnosis of Magnetotail Drivers for Ionospheric Electrodynamics Using Networks of Ground-based Magnetometers Diagnosis of Magnetotail Drivers for Ionospheric Electrodynamics Using Networks of Ground-based Magnetometers

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa24a..02m&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA24A-02

Physics

2744 Magnetotail, 2790 Substorms, 2794 Instruments And Techniques

Scientific paper

One of the most important problems in solar-terrestrial physics concerns understanding the response of the ionosphere to a variety of physical drivers from the magnetotail. In particular, determining the ionospheric response to magnetotail disturbances such as current disruptions and Earthward-directed bursty bulk flows is key to understanding the causal sequence of events during substorms. We present a series of case studies using data from combined networks of magnetometers in the Canadian sector, including those from CARISMA (www.carisma.ca) and the THEMIS ground-based observatory (GBO) network and supporting arrays, to examine the current response in the ionosphere to substorm expansion phase onset. These analyses highlight the importance of extensive magnetometer coverage in order to correctly identify and characterise the initiation and temporal dynamics of substorm-time ionospheric electrodynamics and current systems. We show how magnetometer data can be used to locate and time the onset of substorms using Pi1 data, and further develop a magnetic disturbance diagnostic which may distinguish between tail drivers. We suggest that the structure of the resulting current systems may enable these processes to be distinguished using a new set of local magnetometer derived disturbance indices. We suggest forms for these new ionospheric disturbance indices, as an extension to the traditional AE, AL and AU indices. We show how these diagnostics can provide important input into substorm studies, especially in partnership with in-situ measurements from the THEMIS probes, and contribute towards resolving the causal sequence of energy release in the substorm cycle.

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