Southern Hemisphere Ocean Tracer Study (SHOTS): An overview and preliminary results

2006 ◽  
pp. 53-66 ◽  
Author(s):  
M. Aoyama ◽  
M. Fukasawa ◽  
K. Hirose ◽  
R.F.C. Mantoura ◽  
P.P. Povinec ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Tracer Study ◽  
Preliminary Results

scholarly journals When a Nova Becomes Old

2015 ◽  
Vol 2 (1) ◽  
pp. 226-229
Author(s):  
A. Ederoclite ◽  
C. Tappert ◽  
L. Schmidtobreick ◽  
N. Vogt
Keyword(s):  
Southern Hemisphere ◽  
Orbital Period ◽  
Cataclysmic Variables ◽  
Classical Novae ◽  
Preliminary Results

Here we present the preliminary results of a project aimed at unveiling the nature of classical novae decades after their eruption. The ultimate goal of this project is to describe the population of cataclysmic variables which give rise to nova explosions. So far, in four years of observations, we have concentrated on novae in the Southern hemisphere, where we increased by 100% the amount of objects spectroscopically confirmed and increased by 1/5 the amount of objects with known orbital period.

scholarly journals Variations of Radiocarbon in Tree Rings: Southern Hemisphere Offset Preliminary Results

Radiocarbon ◽  
1998 ◽  
Vol 40 (3) ◽  
pp. 1153-1159 ◽  
Author(s):  
F. G. McCormac ◽  
A. G. Hogg ◽  
T. F. G. Higham ◽  
M. G. L. Baillie ◽  
J. G. Palmer ◽  
...  
Keyword(s):  
New Zealand ◽  
Great Britain ◽  
Northern Ireland ◽  
Southern Hemisphere ◽  
High Precision ◽  
Tree Rings ◽  
Precision Measurements ◽  
Preliminary Results ◽  
Queen's University

The Queen's University of Belfast, Northern Ireland and University of Waikato, Hamilton, New Zealand radiocarbon laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus patrea) and cedar (Libocedrus bidwillii) from Great Britain and New Zealand, respectively. The results show a real atmospheric offset of 3.4 ± 0.6% (27.2 ± 4.7 14C yr) between the two locations for the interval ad 1725 to ad 1885, with the Southern Hemisphere being depleted in l4C. This result is less than the value currently used to correct Southern Hemisphere calibrations, possibly indicating a gradient in Δ14C within the Southern Hemisphere.

scholarly journals Optical Search for High Meteors in Hyperbolic Orbits

1996 ◽  
Vol 150 ◽  
pp. 83-86 ◽  
Author(s):  
S.C. Woodworth ◽  
R.L. Hawkes
Keyword(s):  
Southern Hemisphere ◽  
Detection System ◽  
Mass Range ◽  
Television Studies ◽  
Apparent Magnitude ◽  
Correction Factors ◽  
Short Baseline ◽  
Preliminary Results ◽  
Meteor Detection ◽  
Small Fields

AbstractDual-station image intensified television studies have indicated very few meteors at heights greater than 120 km, and few statistically significant hyperbolic orbits. However, the optimum intersection height for these studies was about 95 km, and the relatively small fields of view resulted in a bias against high (and therefore fast) meteors. We have developed height sensitivity correction factors, and found that short baseline television studies resulted in relatively little bias against high meteors, and the absence of meteors above 120 km appears to be real. We report preliminary results from a three-station, image-intensified video meteor detection system sensitive to apparent magnitude about +9.5 with optimum intersection heights 115-125 km. We have detected neither particularly high meteors nor meteors in clearly hyperbolic orbits. We conclude that the proportion of true hyperbolic meteors in the mass range 10-4 to 10-6 kg is less than a few percent, and that optical meteors corresponding to meteoroids in this mass range do not ablate at heights above approximately 120 km. We suggest several ways to reconcile these results with southern hemisphere radar studies.

Preliminary Results Obtained with an Aperture Synthesis Telescope at 30 MHz

1972 ◽  
Vol 2 (2) ◽  
pp. 115-117 ◽  
Author(s):  
E. A. Finlay ◽  
B. B. Jones
Keyword(s):  
High Resolution ◽  
Southern Hemisphere ◽  
Radio Telescope ◽  
Hii Regions ◽  
Preliminary Results ◽  
Sky Survey ◽  
The Galaxy ◽  
Background Temperature ◽  
Two Temperatures ◽  
Galactic Background

A 30 MHz radio telescope has recently been completed at Fleurs, N.S.W. There has been a need for a high resolution sky survey to be carried out in the Southern Hemisphere at a frequency intermediate between 19.7 MHz (Shain et al.) and 85.7 MHz (Mills et al). One particular reason lies in the fact that some HII regions which are seen in absorption against the galactic background at 19.7 MHz and in emission at 85.7 MHz may match the background temperature at 30 MHz. If the temperature of such a region has been found by other means, the 30 MHz temperature of the portion of the Galaxy beyond it is determined irrespective of conditions nearer the observer, since the two temperatures must be equal.

scholarly journals Microparticle Concentration and Electrical Conductivity of a 700 m Ice Core from Mizuho Station, Antarctica

1988 ◽  
Vol 10 ◽  
pp. 38-42 ◽  
Author(s):  
Yoshiyuki Fujii ◽  
Okitsugu Watanabe
Keyword(s):  
Electrical Conductivity ◽  
Southern Hemisphere ◽  
Large Scale ◽  
Particle Concentration ◽  
Environmental Changes ◽  
Ice Core ◽  
Depth Interval ◽  
Preliminary Results ◽  
High Particle Concentration ◽  
High Particle

The present paper gives the preliminary results of the analyses on microparticle concentration and electrical conductivity of a 700.56 m ice core from Mizuho Station, Antarctica. Concentration of microparticles coarser than 0.63 μm in diameter increases more than twofold at the 240-440 m depth interval compared with that below 440 m in depth. The higher particle concentration is well associated with higher electrical conductivity and lower δ18O. Periods of high particle concentration are estimated to be 3000-6000 years B.P. A visible volcanic dirt band was found at 500.7 m below the surface. This dirt band may be isochronous with the shallowest ash band of the Byrd Station core, found at 799 m depth. The present study indicates that large-scale environmental changes possibly occurred in the Southern Hemisphere in the middle of the Holocene.

scholarly journals Microparticle Concentration and Electrical Conductivity of a 700 m Ice Core from Mizuho Station, Antarctica

1988 ◽  
Vol 10 ◽  
pp. 38-42
Author(s):  
Yoshiyuki Fujii ◽  
Okitsugu Watanabe
Keyword(s):  
Electrical Conductivity ◽  
Southern Hemisphere ◽  
Large Scale ◽  
Particle Concentration ◽  
Environmental Changes ◽  
Ice Core ◽  
Depth Interval ◽  
Preliminary Results ◽  
High Particle Concentration ◽  
High Particle

The present paper gives the preliminary results of the analyses on microparticle concentration and electrical conductivity of a 700.56 m ice core from Mizuho Station, Antarctica. Concentration of microparticles coarser than 0.63 μm in diameter increases more than twofold at the 240-440 m depth interval compared with that below 440 m in depth. The higher particle concentration is well associated with higher electrical conductivity and lower δ18O. Periods of high particle concentration are estimated to be 3000-6000 years B.P. A visible volcanic dirt band was found at 500.7 m below the surface. This dirt band may be isochronous with the shallowest ash band of the Byrd Station core, found at 799 m depth. The present study indicates that large-scale environmental changes possibly occurred in the Southern Hemisphere in the middle of the Holocene.

Radio Polarization Observations of Three Southern Galaxies

1990 ◽  
Vol 8 (3) ◽  
pp. 257-260 ◽  
Author(s):  
J. I. Harnett ◽  
R. F. Haynes ◽  
R. Wielebinski ◽  
U. Klein
Keyword(s):  
Magnetic Fields ◽  
Southern Hemisphere ◽  
Long Range ◽  
Radio Telescopes ◽  
Max Planck ◽  
Preliminary Results ◽  
Polarized Emission

AbstractObservations of polarized emission and consequently the investigation of magnetic fields in northern galaxies, have been conducted successfully for some time with, for example, the 100-m Effelsberg telescope of the Max-Planck-Institut-für Radioastronomie and the VLA. However, the opportunity to make corresponding studies in the southern hemisphere has only recently become possible. Therefore, we have begun a long-range project aimed at studying the morphology and dynamics of southern galaxies using the facilities of the Parkes and Molonglo radio telescopes, the Siding Spring optical facilities and the Australia Telescope. Here we present preliminary results from Parkes observations of the three well known galaxies: NGC 253, NGC 4945 and M 83.

Southern Hemisphere Seti Survey: Five Years of Project Meta II

1997 ◽  
Vol 161 ◽  
pp. 611-621
Author(s):  
Guillermo A. Lemarchand ◽  
Fernando R. Colomb ◽  
E. Eduardo Hurrell ◽  
Juan Carlos Olalde
Keyword(s):  
Southern Hemisphere ◽  
Scattering Theory ◽  
Galactic Plane ◽  
Narrow Band ◽  
Neutral Hydrogen ◽  
Sky Survey ◽  
Inertial Frames ◽  
Interstellar Scattering ◽  
Extraterrestrial Origin ◽  
Spectral Channels

AbstractProject META II, a full sky survey for artificial narrow-band signals, has been conducted from one of the two 30-m radiotelescopes of the Instituto Argentino de Radioastronomía (IAR). The search was performed near the 1420 Mhz line of neutral hydrogen, using a 8.4 million channels Fourier spectrometer of 0.05 Hz resolution and 400 kHz instantaneous bandwidth. The observing frequency was corrected both for motions with respect to three astronomical inertial frames, and for the effect of Earths rotation, which provides a characteristic changing signature for narrow-band signals of extraterrestrial origin. Among the 2 × 1013spectral channels analyzed, 29 extra-statistical narrow-band events were found, exceeding the average threshold of 1.7 × 10−23Wm−2. The strongest signals that survive culling for terrestrial interference lie in or near the galactic plane. A description of the project META II observing scheme and results is made as well as the possible interpretation of the results using the Cordes-Lazio-Sagan model based in interstellar scattering theory.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

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