Computer Science – Sound
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21a0354c&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM21A-0354
Computer Science
Sound
0728 Ice Shelves, 2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere, 2479 Solar Radiation And Cosmic Ray Effects, 6221 Europa
Scientific paper
The polar cryosphere and ionosphere of Earth provide unique testbeds for active radio sounding and are gateways to exploration of other icy worlds in the solar system such as Europa and Titan. In the context of the International Polar Year and the International Heliophysical Year we are planning coordinated measurements of Antarctic ice sheet stratigraphy, the bottomside polar ionosphere, the polar magnetosphere, and high energy cosmic ray showers from ground level to about 40 km altitude. The analogous environment at Europa is the extremely thin neutral atmosphere but comparably dense ionosphere formed by interaction of the extremely intense radiation environment of the Jovian magnetosphere with surface ices of Europa. The effort proposed to NASA centers around Antarctic circumpolar balloon flights at high altitude during IPY-IHY, and thereafter, of a new radio sounder instrument called the Balloon Adaptable Radio Ice-Ionosphere Sounder (BARIIS) as an add-on package to available cosmic ray balloon payloads. This instrument would simultaneously sound at MHz radio frequencies, above and below ionospheric cutoff, the subsurface ice below the balloon ground track and the bottomside ionosphere above the balloon. Carried out in conjunction with direct cosmic ray shower measurements by the primary balloon payload, ground digisonde measurements, and geospace satellite monitoring of space weather, the ionospheric sounding is expected to improve knowledge of polar D region response to short-term cosmic ray variations during the few weeks of each flight. Correlative measurements will be made by the balloon and ground stations in conjunction with those of the comparable Radio Plasma Imager instrument on the IMAGE satellite in the polar magnetosphere. For the Antarctic cryosphere the subsurface ice sounding offers the prospect of new discoveries and improved measurements for Europa-like features such as isochronal layers, subglacial lakes and ice streams, while also contributing to the cumulative knowledge of polar ice sheet thickness and change with time in comparison to previous surveys. For polar ionosphere-magnetosphere-heliosphere studies our Polar Gateways team is part of the conditionally endorsed ICESTAR-IHY (Interhemispheric Conjugacy in Geospace Phenomena and their Heliospheric Drivers) lead science group for IPY. Our cryospheric measurements are included as part of the GIIPSY (Global Inter-agency IPY Polar Snapshot Year) group.
Benson Robert F.
Bilitza Dieter
Bindschadler Robert A.
Clem John Mason
Cooper John F.
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