-
Article
Failure of plume theory to explain midplate volcanism in the southern Austral islands
It has long been recognized that the properties of the Cook–Austral chain (Fig. 1) of volcanoes in the South Pacific are difficult to reconcile with the theory that volcanic activity in plate interiors is produce...
-
Article
Drowned islands downstream from the Galapagos hotspot imply extended speciation times
THE volcanic islands of the Galapagos archipelago are the most recent products of a long-lived mantle hotspot1,2. Little is known, however, of the submarine Galapagos platform on which the islands are built, or o...
-
Article
Nosocomial pneumonia: Epidemiology and infection control
Elderly, debilitated, or critically ill patients are at high risk for hospital acquired or nosocomial respiratory tract infection. Gram-negative bacilli,Staphylococcus aureus, and anaerobes colonizing the orophar...
-
Article
An unusually strong Einstein ring in the radio source PKS1830–211
RADIO observations of the strong, flat-spectrum radio source PKS1830–211 revealed a double structure, with a separation of 1 arcsec, suggesting that it might be a gravitationally lensed object1. We have now obtai...
-
Chapter
Coronal Mass Ejections and Coronal Structures
The coronal portion of the solar atmosphere consists of a wide variety of structures which exhibit a similarly wide variety of dynamical processes and kinds of activity. The launch of the SMM presented an oppo...
-
Article
Rapid eruption of the Deccan flood basalts at the Cretaceous/Tertiary boundary
The accumulation of flood basalts of the Deccan Traps, western India, is one of the most remarkable volcanic provinces on Earth in sheer extent and volume. These rocks are akin in composition and occurrence to...
-
Article
The genesis of refractory melts in the formation of oceanic crust
Refractory, primary liquids arising in various oceanic plate tectonic settings are characterized by high MgO, SiO2, Ca/Na, low TiO2 and generally low incompatible element abundances relative to primary liquids pa...
-
Article
Plume versus lithospheric sources for melts at Ua Pou, Marquesas Islands
The remarkable distinction between the compositions of ocean island basalts (OIBs) and mid-ocean ridge basalts (MORBs) provides an important constraint on models of mantle composition and structure1–3. Previous s...
-
Article
Rapid fluctuations in the position, size, and brightness of intense solar metre-wave radio sources
A comparison of quiescent type I solar radio sources with concurrent intense impulsive type III, V, and type II sources shows that whereas the type I sources are usually small and stable the type III, V, and I...
-
Article
The relation between brightness fluctuations and polarization of solar metre-wave emission
Solar 80 MHz emission recorded by the Culgoora radioheliograph over a number of years, no matter what its spectral type, has followed a persistent pattern. Emission with average polarization < 40%, even if bur...
-
Article
Dynamic behaviour of the K-corona above a type I radio source
Coronagraph images can be greatly enhanced by subtracting from the brightness of each picture point, the running median brightness over a square surrounding each picture point. The application of this techniqu...
-
Article
Optical counterpart of the radio event accompanying the 3B flare of 13 May 1981
Excepting intermittent type III activity, all the radio events over the frequency range 8–8000 MHz accompanying the initial stage of the 3B flare of 13 May, 1981 had their onset in a 2-min interval immediately...
-
Article
Langmuir-wave conversion as the explanation of moving type IV solar meter-wave radio outbursts
The properties of moving type IV solar radio outbursts observed with the Culgoora radioheliograph and radiospectrograph suggest that these outbursts - even those which rise to great coronal heights - originate...
-
Chapter
Recent Very Bright Type IV Solar Metre-Wave Radio Emissions
Stewart et al. (1978) have reported moving Type IV solar metrewave radio outbursts with brightness temperatures between 108 and 1010 K. We now report Culgoora radioheliograph observations of four more Type IV rad...
-
Article
Wave ducting of solar metre-wave radio emission as an explanation of fundamental/harmonic source coincidence and other anomalies
On the basis of source positions determined by the Culgoora radioheliograph we suggest that metre-wave radio emission propagates from the Sun along under-dense magnetic flux tubes. Such wave ducting is able to...
-
Article
Temperature dependence of the μ+ hyperfine field in Gd and Co and its comparison with other ferromagnets
-
Article
Pitcairn Island—another Pacific hot spot?
The volcanic Pitcairn Island, which has surface lavas with apparent ages between 0.45 and 0.93 Myr, may be the youngest member of another NW-SE trending volcanic lineament in the Pacific Ocean.
-
Chapter
Source Structure in Metre-Wave Type V Solar Bursts
The type V burst has been defined as a wideband continuum which sometimes appears for a minute or so following a type III burst (Wild et al., 1959b). It is now generally accepted that type III bursts arise from p...
-
Article
Does the Mantle Roll?
Comparison of plume traces with palaeomagnetic data from lithospheric plates for the past 50 m.y. suggests that the mantle has rolled about its own independent axis within an outer lithospheric shell which as ...
-
Article
Mantle Plumes, Movement of the European Plate, and Polar Wandering
The passage of lithospheric plates over thermal plumes or hotspots in the mantle is discussed with respect to the history of two igneous chains in the European plate.
