A specialized torsion balance designed to measure the absolute flux density of hyperthermal molecular beams containing reactive species

1996 ◽  
Vol 67 (5) ◽  
pp. 1781-1789 ◽  
Author(s):  
Steven R. Cook ◽  
Mark A. Hoffbauer ◽  
Jon B. Cross ◽  
Hermann Wellenstein ◽  
Manfred Fink
Keyword(s):  
Flux Density ◽  
Molecular Beams ◽  
Reactive Species ◽  
Torsion Balance ◽  
Absolute Flux ◽  
The Absolute

The Brightness Temperature of Venus and the Absolute Flux-Density Scale at 608 MHZ

1973 ◽  
Vol 183 ◽  
pp. 1081 ◽  
Author(s):  
Duane O. Muhleman ◽  
Glenn L. Berge ◽  
Glenn S. Orton
Keyword(s):  
Brightness Temperature ◽  
Flux Density ◽  
Absolute Flux ◽  
The Absolute ◽  
Density Scale

scholarly journals The UV Spectrum of W Cep.

1980 ◽  
Vol 88 ◽  
pp. 549-553
Author(s):  
R. Faraggiana
Keyword(s):  
Uv Spectrum ◽  
Absolute Flux ◽  
The Absolute

IUE spectra of VV Cep have been obtained in 1978 and 1979 during the chromospheric phase of the eclipse. The profiles of the Mg II resonance lines differ from one another and this peculiarity, common to other M type supergiants, is examined. The value of Mv derived from the extension of the Wilson and Bappu relation to Mg II lines is compared with other determinations. The variation of the absolute flux in the 1200-2000 Å range is presented.

scholarly journals Characterisation of the MALT90 Survey and the Mopra Telescope at 90 GHz

2013 ◽  
Vol 30 ◽  
Author(s):  
J. B. Foster ◽  
J. M. Rathborne ◽  
P. Sanhueza ◽  
C. Claysmith ◽  
J. S. Whitaker ◽  
...  
Keyword(s):  
Time Of Day ◽  
Repeated Observations ◽  
Absolute Flux ◽  
The Absolute ◽  
Flux Calibration

AbstractWe characterise the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90) and the Mopra telescope at 90 GHz. We combine repeated position-switched observations of the source G300.968+01.145 with a map of the same source in order to estimate the pointing reliability of the position-switched observations and, by extension, the MALT90 survey; we estimate our pointing uncertainty to be 8 arcsec. We model the two strongest sources of systematic gain variability as functions of elevation and time-of-day and quantify the remaining absolute flux uncertainty. Corrections based on these two variables reduce the scatter in repeated observations from 12%–25% down to 10%–17%. We find no evidence for intrinsic source variability in G300.968+01.145. For certain applications, the corrections described herein will be integral for improving the absolute flux calibration of MALT90 maps and other observations using the Mopra telescope at 90 GHz.

scholarly journals Diagnosing the Surface Layer Parameters for Dispersion Models within the Meteorological-to-Dispersion Modeling Interface

2010 ◽  
Vol 49 (2) ◽  
pp. 221-233 ◽  
Author(s):  
M. Sofiev ◽  
E. Genikhovich ◽  
P. Keronen ◽  
T. Vesala
Keyword(s):  
Surface Layer ◽  
Weather Forecasting ◽  
Dispersion Model ◽  
Temporal Correlation ◽  
Complex Surface ◽  
Dispersion Modeling ◽  
Limited Area ◽  
Dispersion Models ◽  
Absolute Flux ◽  
The Absolute

Abstract The problem of providing dispersion models with meteorological information from general atmospheric models used, for example, for weather forecasting is considered. As part of a generalized meteorological-to-dispersion model interface, a noniterative scheme diagnosing the surface layer characteristics from wind, temperature, and humidity profiles was developed. The scheme verification included long-term comparison with data of meteorological masts at Cabauw, the Netherlands, and Hyytiälä, Finland. The algorithm compatibility and consistency with the High-Resolution Limited-Area Model (HIRLAM) was also checked, as this model is routinely used as a meteorological driver for the Air Quality and Emergency Modeling System (SILAM). The comparison with Cabauw mast data showed a good quantitative agreement between observed and diagnosed heat and momentum fluxes: the temporal correlation coefficient was ∼0.8, bias was less than 10% of the absolute flux levels, regression slope deviated from unity for less than 20% with the intercept being less than 10% of the absolute flux values, and so on. In the case of complex surface features (Hyytiälä mast in forest) the scheme proved to be robust with large deviations appearing only if the input profile data were taken outside the constant-flux layer. Comparison with the HIRLAM model showed qualitatively good agreement but also highlighted several differences between the goals, standards, and methodologies of meteorological and dispersion models. The scheme was implemented in SILAM, which served as the development platform.

scholarly journals Evolution of the Radio Emission from Young SNRs according to Observational Data

1979 ◽  
Vol 32 (2) ◽  
pp. 95 ◽  
Author(s):  
KS Stankevich
Keyword(s):  
Experimental Data ◽  
Radio Emission ◽  
Flux Density ◽  
Observational Data ◽  
Spectral Index ◽  
Density Measurements ◽  
The Past ◽  
Absolute Flux ◽  
Density Decrease ◽  
Frequency Variations

Results are given from a still-continuing series of absolute flux density measurements for the SNR CasA. The measurements have been taken regularly over the past 16 years at 24 wavelengths in the range 3-60 cm. New data are presented for the rate of flux density decrease, and for time and frequency variations in the spectral index. Intensity increases that are localized in frequency are described. The results are generalized in a model for the radio emission from a young SNR, and this is used to analyse experimental data for flux density decreases in the emission from 3C 10 and 58.

The Absolute Flux Distribution of Sirius

1970 ◽  
Vol 1 (8) ◽  
pp. 378-379 ◽  
Author(s):  
J. Davis ◽  
R. J. Webb
Keyword(s):  
Effective Temperature ◽  
Flux Distribution ◽  
Model Atmosphere ◽  
Angular Diameter ◽  
Sufficient Data ◽  
Absolute Flux ◽  
Stringent Test ◽  
Net Flux ◽  
The Absolute

The angular diameter of a star, combined with observed stellar fluxes in absolute units, allows the absolute fluxes emitted at the surface of the star to be calculated and thus provides a stringent test of model atmosphere predictions. Furthermore, if the flux distribution is observed at all wavelengths contributing significantly to the net flux, an empirical effective temperature can be found. Sufficient data are now available for Sirius (αCMa) to be studied in this way.

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