Award Abstract #0519072
NSWP: Predicting Geomagnetically Induced Fields Driven by Solar Wind Pressure Discontinuities

NSF Org:	ATM Division of Atmospheric Sciences
Initial Amendment Date:	July 15, 2005
Latest Amendment Date:	July 31, 2007
Award Number:	0519072
Award Instrument:	Continuing grant
Program Manager:	Robert M. Robinson ATM Division of Atmospheric Sciences GEO Directorate for Geosciences
Start Date:	July 1, 2005
Expires:	June 30, 2009 (Estimated)
Awarded Amount to Date:	$320473
Investigator(s):	David Murr murrdl@augsburg.edu (Principal Investigator) Simon Shepherd (Co-Principal Investigator)
Sponsor:	Dartmouth College OFFICE OF SPONSORED PROJECTS HANOVER, NH 03755 603/646-3007
NSF Program(s):	MAGNETOSPHERIC PHYSICS, UPPER ATMOSPHERIC FACILITIES, SOLAR-TERRESTRIAL
Field Application(s):	0205000 Space
Program Reference Code(s):	EGCH, 9196, 9150, 4444
Program Element Code(s):	5750, 4202, 1523

ABSTRACT

Geomagnetically induced currents (GICs) are a direct consequence of space weather. They are caused primarily by intense and rapidly varying ionospheric currents that can be hazardous to technological systems on the surface of the Earth. Sudden impulse (SI) events caused by the passage of interplanetary shocks have been shown to produce magnetic variations on the ground large and fast enough to cause large GICs. The aim of this project is to develop empirical and physics-based models of the ionospheric portion of the SI current system and use these models to calculate, and ultimately predict, the geomagnetically induced fields at the surface of the Earth. The study will be accomplished by developing an empirical model of the SI currents using measurements from ground-based magnetometers combined with radar measurements of the ionospheric plasma drift. Also, a physics-based model of the SI currents system will be developed using a global magnetospheric model and upstream solar wind measurements to evaluate its ability to represent the current system. The induced magnetic and electric fields from these model current system will be calculated using the numerical techniques known as the method of auxiliary sources, the complex image method, and by utilizing the magnetotelluric equations and a model of the Earth's conductivity. The result of the project will be a predictive model, based on the upstream solar wind conditions, that will forecast the size, location, and duration of geomagnetically induced fields produced by SI events. In addition, techniques that combine magnetometer and radar data will be developed. This research has important scientific relevance becaue large GICs are known to cause severe effects on electric power grids, sometimes resulting in socioeconomic losses that can exceed tens of millions of dollars. The research will involve both undergraduate and graduate students in the engineering and physics departments.

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

(Showing: 1 - 2 of 2).

Murr, D.L., and W.J. Hughes.  "The Coherence between the IMF and High-Latitude Ionospheric Flows: The Dayside Magnetosphere - Ionosphere Low-Pass Filter,"  Journal of Atmospheric and Solar-Terrestrial Physics,  v.69,  2007,  p. 223.

Simon G. Shepherd.  "Polar cap potential saturation: Observations, theory, and modeling,"  Journal of Atmospheric and Solar-Terrestrial Physics,  v.69,  2007,  p. 234.


(Showing: 1 - 2 of 2).

Please report errors in award information by writing to: awardsearch@nsf.gov.