CEDAR High Latitude Plasma Structures (HLPS): A Modeler's Viewpoint

Details CEDAR High Latitude Plasma Structures (HLPS): A Modeler's Viewpoint CEDAR High Latitude Plasma Structures (HLPS): A Modeler's Viewpoint

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa11a..10s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA11A-10

Physics

2439 Ionospheric Irregularities, 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere

Scientific paper

In the early 1980's, it was realized that the polar ionosphere was highly structured and that certain of these structures were correlated with adverse communication effects, specifically scintillations. These structures were categorized and labeled: tongues of ionization, patches, polar holes, boundary blobs, polar arcs, etc. Even the role of instabilities, such as the gradient drift instability, was identified and associated with the "trailing edges" of patches. Empirically, the relative control that the northward and southward IMF had was identified. In the early 1990s, the NSF CEDAR community initiated the High Latitude Plasma Structures (HLPS) working group. This working group, in close collaboration with the international community through a STEP Global Aspects of Plasma Structures (GAPS) working group, combined efforts through observation campaigns, extensive collaboration with theorists and modelers, and joint workshops, has systematically uncovered much of the physics of polar cap structures, although not yet at levels that provide specification or quantitative forecast. This presentation will highlight how a modeler who participated, and continues to participate, in this CEDAR HLPS working group saw the breakthroughs in our understanding of polar cap phenomena. He also takes the opportunity to point out the hurdles still to be overcome and the challenges the HLPS community faces to get the job done this decade.

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