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AGU Journal Highlights -- March 19, 2008
Date:3/19/2008

pheres infrared emissions from radiative cooling and another of which measures ultraviolet energy radiated by the Sun, have now been measuring for more than 5 years. Mlynczak et al. analyze these data streams and find that the infrared and solar time series exhibit a decrease in radiated and absorbed power, consistent with the waning phase of the solar cycle. The infrared time series also exhibits high-frequency variations that are not evident in the solar power time series. Spectral analysis shows a statistically significant 9-day periodicity in the infrared but not the solar data. The authors link these 9-day periodicities to the recurrence of coronal holes on the Sun. These results demonstrate a direct coupling between the upper atmosphere of the Sun and the infrared energy budget of the thermosphere.

Title: Solar-terrestrial coupling evidenced by periodic behavior in geomagnetic indexes and the infrared energy budget of the thermosphere

Authors: Martin G. Mlynczak, Christopher J. Mertens, and Ellis E. Remsberg: NASA Langley Research Center, Hampton, Virginia, U.S.A.;

F. Javier Martin-Torres: Analytical Services and Materials, Inc., Hampton, Virginia, U.S.A.;

B. Thomas Marshall, R. Earl Thompson, and Larry L. Gordley: G & A Technical Software, Newport News, Virginia, U.S.A.;

Janet U. Kozyra: University of Michigan, Ann Arbor, Michigan, U.S.A.;

James M. Russell III: Hampton University, Hampton, Virginia, U.S.A.;

Thomas Woods: Laboratory for Atmospheric and Space Physics, Boulder Colorado, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL032620, 2008; http://dx.doi.org/10.1029/2007GL032620


9. North Atlantic Current spins off eddies as it broadens

The warm Gulf Stream flows east offshore of the North American coastline on its way north from Florida to Newfoundland. Southeast of Newfound
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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