Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0487b&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0487
Other
2439 Ionospheric Irregularities, 2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2708 Current Systems (2409)
Scientific paper
Black aurora is a region, spatially well defined, within a broad and usually uniform diffuse aurora that clearly exhibit a lack of luminosity, thus appearing black. These black regions have similar dynamical features as discrete small scale auroral arcs, but the sense of rotation of black curls are opposite to that of auroral curls. Recent theories explain black aurora as regions where downward currents is closing the auroral current circuit, and electrons are flowing out from the ionosphere. Thus the local plasma density of the ionosphere inside the black aurora should be lower than in the normal night side ionosphere, and distinctively lower than in the adjacent luminous aurora. On the other hand, black aurora can also be explained as an optical effect, where the surrounding luminous aurora tricks both the eye and other advanced optical instruments, because of their limited bandwidth, making it appear darker than what it really is. In this latter case, the plasma density within the black aurora should not differ much from that in the surrounding diffuse aurora. However, no local measurements of plasma density within black aurora has been made up to now. We present the first results from such measurements, utilizing the EISCAT radar facility in Ramfjordmoen, Norway, for density measurements, and image intensified video for locating the density measurements in relation to the black aurora.
Blixt Erik Mårten
Grydeland Tom
Isham B.
Kosch Michael J.
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