Ionospheric Yearly Variations from Polar Cusp through Mid-latitude: IPY ISR Observations

Details Ionospheric Yearly Variations from Polar Cusp through Mid-latitude: IPY ISR Observations Ionospheric Yearly Variations from Polar Cusp through Mid-latitude: IPY ISR Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33b1643z&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33B-1643

Physics

2419 Ion Chemistry And Composition (0335), 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2447 Modeling And Forecasting

Scientific paper

The first year's IPY observations by incoherent scatter radars (ISRs) provided an excellent opportunity to investigate yearly variations of the upper atmosphere for a period with very low solar activity and quiet magnetic activities. Observations have been conducted by ISRs at Svalbard, Porker Flat, Sondrestrom and Millstone Hill. This array of radars spanning from polar cusp, auroral zone, to mid-latitudes enables us to address some fundamental concerns about the upper atmosphere climatology, such as the yearly changes of the ionosphere from high- to middle- latitudes, in particular the altitude dependency of such changes. In this work we use a full year's worth of data from all 4 radars to discuss annual and semiannual changes in electron density and plasma temperatures. Some interesting features will be presented, such as the pronounced semiannual variation in Ne at the polar cusp and its absence at auroral zone. Very different from known variation patterns typical for midlatitudes, the electron density variation at Millstone Hill is characterized with totally asymmetric inter-annual changes with the maximum in winter and a secondary one in spring. There is also clear phase changes of the maxima with height. We will also show a comparison was for Millstone Hill between this current IPY observations and those from previous solar cycles, in order to examine solar cycle to solar cycle variability as well as possible long-term trends.

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