Recent Advances in Magnetoseismology Using Network Observations by Ground Magnetometers

Details Recent Advances in Magnetoseismology Using Network Observations by Ground Magnetometers Recent Advances in Magnetoseismology Using Network Observations by Ground Magnetometers

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa43b..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA43B-03

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2794] Magnetospheric Physics / Instruments And Techniques, [7900] Space Weather

Scientific paper

The rise of modern, synchronized networks of ground magnetometers in recent years has inspired and advanced research and development in magnetoseismology. Like the practice in other geophysical disciplines, magnetoseismology can infer the structure of the magnetosphere from the observations of normal-mode frequencies of the magnetic field. It can also time and locate impulsive events by measuring the signal arrival time at multiple ground stations. We highlight recent advances in using network observations by ground magnetometers for both types of magnetoseismic research. In the area of normal-mode magnetoseismology the increase in ground magnetometers has enabled ever more station pairs suitable for the gradient analysis. We demonstrate progress in automatic detection of field line resonance frequencies and the results that reveal longitudinal structure of the plasmasphere. As a relatively young research topic, travel-time magnetoseismology has shown its capability to time and locate sudden impulses and substorm onsets by using ground-based magnetometer observations. These initial successes in turn motivated detailed examination of MHD wave propagation in the magnetosphere. In the end we discuss how these magnetoseismic studies shed light on the regions in the world where future establishment of ground magnetometers is desirable.

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