5917 to 5928 of 13961 results
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A comparison of plasma densities by EISCAT and the Dynasonde from auroral altitudes: evidence of intense structure
Read more of: A comparison of plasma densities by EISCAT and the Dynasonde from auroral altitudes: evidence of intense structureUnder conditions of moderately-energetic particle precipitation typical of the equatorward side of the auroral oval, plasma densities obtained from routine analysis of EISCAT Common Program data are often a factor […]
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Ionogram inversion for a tilted ionosphere
Read more of: Ionogram inversion for a tilted ionosphereDigital ionosondes such as the Dynasonde disclose that the ionosphere is seldom horizontal even when it is plane stratified to a good approximation. The local magnetic dip does not then […]
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Signals of atmospheric pollution in polar snow and ice
Read more of: Signals of atmospheric pollution in polar snow and iceIn their upper layers, the polar ice sheets contain a detailed record of changes in the atmosphere over the industrial period. Measurements from air bubbles in ice have shown that […]
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Factors affecting variation in foraging and activity patterns of gentoo penguins (Pygoscelis papua) during the breeding season at Bird Island, South Georgia
Read more of: Factors affecting variation in foraging and activity patterns of gentoo penguins (Pygoscelis papua) during the breeding season at Bird Island, South Georgia(1) Radio-telemetry was used to study the activity patterns of gentoo penguins, Pygoscelis papua, at Bird Island, South Georgia, throughout the breeding season, to assess variation in foraging effort (foraging […]
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Growth and survival in macaroni penguin, Eudyptes chrysolophus, A- and B-chicks: do females maximise investment in the large B-egg?
Read more of: Growth and survival in macaroni penguin, Eudyptes chrysolophus, A- and B-chicks: do females maximise investment in the large B-egg?In crested penguins, Eudyptes spp., the first-laid (A) egg is smaller than the second-laid (B) egg and although viable rarely survives to hatching. I studied survival and growth to fledging […]
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Annual variation in breeding biology of gentoo penguins,Pygoscelis papua, at Bird Island, South Georgia
Read more of: Annual variation in breeding biology of gentoo penguins,Pygoscelis papua, at Bird Island, South GeorgiaThe breeding biology of the gentoo penguin, Pygoscelis papua, was studied over a three‐year period (1986–1988) at Bird Island, South Georgia, with particular reference to birds of known age or […]
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Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms
Read more of: Sampling biological characteristics of krill: Effect of heterogeneous nature of swarmsAn effect of the very patchy distribution of Antarctic krill (Euphausia superba Dana) in various forms of aggregation is that a single swarm may not provide an unbiased estimate of […]