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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Imaging observations of coupling processes in the thermosphere-ionospheremagnetosphere system at high and low latitudes Shiokawa Kazuo Solar-Terrestrial Environment Laboratory, Nagoya University This paper provides some recent observations of coupling processes of the thermosphere, ionosphere, and magnetosphere, on the basis of optical measurements of aurora and airglow. The imaging capability of multi-point all-sky imagers enables us to visualize the coupling processes at various latitudes. At high latitudes, auroral energy input from the magnetosphere causes significant disturbances in the thermosphere both on local and global scales. We show examples of large-scale traveling ionospheric disturbances (LSTIDs) during a magnetic storm and intense vertical winds during an auroral substorm. Penetration of magnetospheric electric field associated with storm/substorm also causes global and local disturbances of the ionosphere. At middle and low latitudes, gravity waves from the lower atmosphere and plasma instabilities are two major causes of small-scale disturbances in the thermosphere and the ionosphere. We show examples of medium-scale traveling ionospheric disturbances (MSTIDs) observed at middle and low latitudes and their relation to gravity waves, ionospheric instabilities, and penetrating electric field. These recent imaging observations give new insights and further questions on the coupling processes in the thermosphereionosphere- magnetosphere system, which are the new challenge for the task group 4 of CAWSES-II “What is the geospace response to variable inputs from the lower atmosphere?”
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Topside ionosphere plasma bubbles: season/longitudinal and solar activity dependence Sidorova Larisa Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, IZMIRAN He + density depletions, considered as originating from equatorial plasma bubbles, or as fossil bubble signatures, were involved in this study. He + density depletions were detected from ISS-b spacecraft data (1978-80, F10.7~200) in the topside ionosphere (~1000 km) deeply inside the plasmasphere (L~1.3-3) (Sidorova, ASR, 2004, 2007). (1) It is suggested that the equatorial F region irregularities (EFI), their post sunset development, evolution, and decay processes are controlled by the sunset electrodynamics of the equatorial region. He + density depletion peculiarities were considered in connection with EFI, equatorial F-spread (ESF) and plasma bubbles (PB). Seasonal and longitudinal (s/l) variations of their statistics (McClure, JGR 1998) were compared with the same statistics of He + density depletions obtained under winter, summer, equinoctial condition within 25-50° INVLAT for the both hemispheres. It was revealed that the main statistical maxima of the mentioned above equatorial F-region irregularities are well enough reflected in s/l statistical plots of He + density depletions of the both hemispheres. The best conformity was obtained during the equinox periods, the worst one was revealed during solstice periods, when the most dramatic insolation differences take place for the different hemispheres. (2) According to publications He + density depletions were also revealed on OGO-4, OGO-6, Oreol-1 and DE-2 data. They occur during high/maximal solar activity when He + density layer is very well developed in the topside ionosphere (Wilford et al., JGR, 2003). Using the plasma bubble formation model (Woodman, La Hoz, JGR, 1976), it was concluded that topside plasma bubbles seen in He + density are rather typical phenomena for the topside ionosphere for high solar activity epoch.
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