AGU journal highlights -- Sept. 3, 2008(tly allowing radio communication at high...)

Date:9/3/2008

tly allowing radio communication at higher frequencies and to farther distances. Called "sporadic E," these clouds of ionized gas are frequently observed at midlatitudes but are more rarely observed in low latitudes, most likely because signals become obscured by the intense equatorial electrojet, which is a narrow ribbon of current that flows east above the geomagnetic equator during the day. Using data collected from Peru's Jicamarca Radio Observatory, Malhotra et al. develop a new analysis method to locate sporadic E within the low-latitude ionosphere. They compare the structure and characteristics of these equatorial features with their midlatitude counterparts and find a direct relationship between meteor-produced ionization and the formation and evolution of equatorial sporadic E layers.

Title: Effect of meteor ionization on sporadic-E observed at Jicamarca

Authors: Akshay Malhotra, John D. Mathews, and Julio Urbina: Pennsylvania State University, University Park, Pennsylvania, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL034661, 2008; http://dx.doi.org/10.1029/2008GL034661

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7. Redefining biologically distinct oceanic provinces

Biogeographic provinces are categories used for comparing and contrasting biodiversity and nutrient cycling among different ocean regions. However, their use is limited due to current methods that subjectively classify provinces. It is also unknown how province boundaries respond to seasonal and climate forcings. The currently used static provinces make it difficult to test hypotheses about how biodiversity and nutrient cycling will change over time. To solve this problem, Oliver and Irwin develop a method to objectively classify global remote sensing data so that they automatically define ocean provinces in both space and time. They find that seasonal patterns in province boundaries reflect well-known oceanic processes, as veri
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Contact: Peter Weiss pweiss@agu.org 202-777-7507 American Geophysical Union Source:Eurekalert

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