Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31a1520m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM31A-1520
Physics
[1650] Global Change / Solar Variability, [2162] Interplanetary Physics / Solar Cycle Variations, [2494] Ionosphere / Instruments And Techniques, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
A survey of SuperDARN convection maps during high-speed solar wind streams, revealed a very clear change in the amount of ionospheric backscatter, either a step function increase or decrease, immediately following the onset of the stream. Further investigation revealed that the dramatic increase or decrease in the amount of ionospheric echoes from the northern hemisphere radars is well correlated with the polarity of the transition of the solar sector angle, i.e, the away/toward transition of the interplanetary magnetic field that often occurs at the start of a high-speed stream. These two phenomena were found to be particularly well correlated following the last solar maximum and persisted strongly for approximately two years in the cycle's declining phase. The polarity of the solar sector transition appears to affect the ionosphere on a global scale, and the response of northern and southern SuperDARN data rates are reversed. The mechanism for coupling the solar sector angle and the amount of SuperDARN backscatter has not yet been identified. A predictable increase or decrease of the ionospheric densities on a global scale could effect radio wave propagation, as well as the generation of ionospheric irregularities. Solar sector transitions have been linked to tropospheric weather phenomena, so this clear response of the ionosphere to solar sector transitions could be an important key to understanding the link between solar variability and climate.
Huyghebaert D.
McWilliams Kathryn A.
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