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We describe a preliminary analysis of small-scale temperature perturbations in the stratosphere produced by long wavelength gravity waves, as measured globally during the CRISTA-SPAS missions. We focus on enhanced activity observed at the equator and near the southern tip of South America.
HF signals that propagate via the ionosphere may exhibit Doppler shifts due to a number of processes that give rise to a time dependent refractive index. This paper examines the role of ULF (1–100mHz) wave energy, incident from the magnetosphere, in causing Doppler shifts in HF signals.
With the recent advent of Global Positioning System (GPS) satellites as a research tool in studying the ionised regions that surround the Earth, a need has arisen for a simple yet accurate model for the plasmasphere, the region above the ionosphere.
A Ground Level Enhancement occurred on 14 July 2000 and was observed by at least 18 stations in the worldwide neutron monitor network. Earliest onset was observed between 10.30 and 10.35 UT at several stations. The event is associated with an X5.8 solar flare (importance 3B)…
A number of static GPS measurement campaigns have been made on a floating Antarctic ice shelf, the Amery Ice Shelf, as part of ongoing glaciological studies designed to investigate the ice shelf dynamics, grounding zone definition and ice shelf strain.
The 500 km wide swath of the right-looking ERS Wind scatterometer and the orbital geometry allows measurement of the microwave backscatter of all the Antarctic region between latitudes 55°S and 80°S each three days.
16S rDNA clone library analysis was used to identify bacterial biodiversity in a variety of sea-ice microbial communities (SIMCO). DNA was extracted from seven Antarctic sea-ice samples and … one Arctic sea-ice sample and 16S rDNA PCR-amplified using universal and Archaea-specific primers.
The ice-free habitats of continental Antarctica are among the most geographically isolated on Earth. Colonization of Antarctica requires the immigration of dissemules from distant biotic sites across large distances of snow or open ocean.
A new Holocene sea-level record from the Vestfold Hills, Antarctica, has been obtained by dating the lacustrine-marine and marine-lacustrine transitions that occur in sediment cores from lakes which were formerly connected to the sea. From an elevation of similar to 7.5 m 8000 years ago…
For a copy of the Abstract, please contact author.
For a copy of the Abstract, please contact the author.
The extent of genetic variation and dispersal mechanisms were investigated over short distances of 1 – 100 m and up to 3 km, by the RAPD technique, for the moss Sarconeurum glaciale at three locations on Ross Island, Antarctica. At Arrival Heights, genetic variation occurred within single colonies…
Macquarie Island is an exposure above sea-level of part of the crest of the Macquarie Ridge. The ridge marks the Australia-Pacific plate boundary south of New Zealand…
Three ice dams in southeastern Vestfold Hills, East Antarctica, dam a system of five lakes periodically, impounding more than ~1.5 x 106 m3 of water. Dam #a impounds 1.1 x 106 m3 of water, while dams #b and #c prevent the free drainage of the lake below Dam #a, and impound the remaining 0.