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AGU journal highlights -- Mar. 26, 2013
Date:3/26/2013

nce and increasing vent area track each other: the vent was more stable at times when subsidence rates were lower, while periods when the subsidence rate increased tended to be followed by collapse of parts of the vent wall. They suggest that it may be possible to identify areas where the vent rim is likely to fail soon on the basis of subsidence rate monitoring. The study demonstrates the potential for using high-resolution satellite interferometry for monitoring potential hazards.

Source:
Geophysical Research Letters, doi:10.1002/grl.50286, 2013
http://onlinelibrary.wiley.com/doi/10.1002/grl.50286/abstract

Title:
TerraSAR-X interferometry reveals small-scale deformation associated with the summit eruption of Kilauea Volcano, Hawai'i

Authors:
Nicole Richter: Department of Earth Observation, Friedrich-Schiller-University, Jena, Germany; Michael P Poland: Hawaiian Volcano Observatory, U.S. Geological Survey, Hawai'i National Park, Hawaii, USA; Paul R Lundgren: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.


4. Italian all-sky imager tracks auroral red arcs over Europe

During geomagnetic storms, stable auroral red (SAR) arcs reach down from polar latitudes, their faint glow stretching equatorward of the traditional auroral oval. Invisible to the naked eye, SAR arcs are an upper atmospheric occurrence produced by the emission of light from oxygen atoms in the thermosphere. The excitation of the ionospheric oxygen that produces SAR arcs is caused, in turn, by the conduction of heat from the magnetospheric ring current. Advances in camera optics, including more sensitive sensors and highly specific filters, have allowed researchers to track the occurrence of SAR arcs, opening a window into the
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Contact: Kate Ramsayer
kramsayer@agu.org
202-777-7524
American Geophysical Union
Source:Eurekalert

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