NDLI: Global Ionospheric TEC Perturbations Monitored by the GPS Global Network During Two Northern Hemisphere Winter Storms

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Global Ionospheric TEC Perturbations Monitored by the GPS Global Network During Two Northern Hemisphere Winter Storms

Content Provider	Semantic Scholar
Author	Mannucci, Anthony J. Sparks, Lawrence Pi, Xiaoqing Lindqwister, Ulf J. Wilson, Brian Scott Reyes, M. J.
Copyright Year	1997
Abstract	The global evolution of two major ionospheric storms, occurring on November 4, 1993 and November 26, 1994, respectively, is studied using measurements of total electron content (TEC) obtained from a worldwide network of ground-based GPS receivers. The time-dependent features of ionospheric storms are identified on a global scale using TEC difference maps based on the percent change of TEC during storm time relative to quiet time. The onset of each ionospheric storm is indicated by the appearance of auroralhubauroral TEC enhancements which occur within one hour of the beginning of the geomagnetic storm main phase. Significant TEC enhancements (> 100%) are observed in the winter northern hemisphere. The rate at which TEC enhancements appear is found to correlate with gradients in the Dst index. The large scale ionospheric structures identified during the storms are: (1) nightside auroral/subauroral enhancements which surround the auroral oval; (2) dayside (around noon) high latitude and middle latitude enhancements associated with traveling ionospheric disturbances, and (3) conjugate latitudinal enhancements. For the November 93 storm, a short positive phase (about 15 hours) is followed by a long negative phase (-60 hours). In the November 94 storm, we have identified the clear signature of a traveling ionospheric disturbance (TID) which propagated at a speed of -460 m/s from -70" N to -50" N. The motion of this disturbance appears to conserve angular momentum.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://trs.jpl.nasa.gov/bitstream/handle/2014/18902/98-0001.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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