Daytime, Low Latitude Electric Fields, Inferred From Ground-based Magnetometer Networks in the Peruvian and Philippine Longitude Sectors

Details Daytime, Low Latitude Electric Fields, Inferred From Ground-based Magnetometer Networks in the Peruvian and Philippine Longitude Sectors Daytime, Low Latitude Electric Fields, Inferred From Ground-based Magnetometer Networks in the Peruvian and Philippine Longitude Sectors

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21a0356a&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM21A-0356

Physics

2169 Solar Wind Sources, 2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2712 Electric Fields (2411)

Scientific paper

Recent studies have demonstrated that ground-based magnetometer observations can be used to infer realistic, daytime vertical ExB drift velocities in the Peruvian and Philippine longitude sectors. It has also been demonstrated that under certain conditions the time variability in the Interplanetary Electric Field (IEF) - minutes to hours - is reflected in the daytime, prompt penetration of high latitude electric fields to low latitudes. In this paper, we incorporate magnetometer-inferred ExB drift techniques to extend this study to investigate the relationships between IEF conditions and daytime, low latitude electric field observations under both geomagnetically quiet and disturbed conditions. This paper addresses several basic questions related to the relationships between IEF conditions and low latitude east-west electric fields. 1.) When low latitude electric fields exhibit quiet-time, Sq type behavior, what are the IEF conditions? 2.) Under disturbed conditions, what are the relationships between the IEF parameters and the low latitude electric fields in the Peruvian and Philippine longitude sectors? 3.) If the two longitude sector electric field responses are similar under disturbed conditions, is there a difference in the daytime, vertical ExB drift velocities because the the magnitude of Bo differs between the two sectors (ExB drift ~ E/Bo)? We address the above questions by analyzing magnetometer-inferred ExB drift velocities between January, 2001 and December, 2004 when there exists more than 450 quiet days and more than 135 geomagnetically disturbed days, defined by daily Ap values greater than 20. It is demonstrated that the neural network approach that provides realistic ExB drift velocities based on magnetometer observations can be applied at all longitudes where appropriately placed magnetometers exist.

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