Ionospheric Storms: Average Patterns for Seasonal, Solar Cycle and Local Time of Storm Onset at Sub-Auroral Sites in Both Hemispheres.

Details Ionospheric Storms: Average Patterns for Seasonal, Solar Cycle and Local Time of Storm Onset at Sub-Auroral Sites in Both Hemispheres. Ionospheric Storms: Average Patterns for Seasonal, Solar Cycle and Local Time of Storm Onset at Sub-Auroral Sites in Both Hemispheres.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33a1614n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33A-1614

Physics

2400 Ionosphere (6929), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2441 Ionospheric Storms (7949)

Scientific paper

Near the east US coast (~70°W), ionospheric storms show an initial positive phase, which maximizes with a "dusk-effect" at sub-auroral latitudes, followed by nighttime depletion signatures of the trough, and then several days of daytime negative phase effects. Electrodynamical transport processes are responsible for the initial behavior of the storms, while thermospheric circulation and composition changes initiated by heating in the auroral zones determine the development of the negative phase. In the Australian sector (~130°E), however, the dipole tilt results in geophysically-comparable locations to those at ~70 W in the northern hemisphere. We have taken the 206 storm events during solar cycle #20 (1964-1976) and analyzed ionosonde data from Hobart, Tasmania (43 S, 147 E, geomagnetic lat = -52), as well as from Wallops Island (39 N, 76 W, geomagnetic latitude = 52). The disturbance patterns in NmF2 at Wallops Island and Hobart are broadly consistent, with some differences occurring for the initial positive phase. We have conducted a new analysis of the F-layer to investigate how the solar cycle phase, the local time of the storm commencement, and the season in which the storm occurs might affect the initial positive phase and the duration of an ionospheric storm.

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