... In order to disentangle the effects of different climate variables on tree-ring growth rates of different species, and to explore the possibility that more than one species could improve the accuracy of the reconstructions of climate using tree rings, a methodical study of trees in close proximity to the Armagh Observatory climate station was initiated together with Ana Maria Garc?a Su?rez, and continued as part of the latter's PhD thesis with John Butler and Professor Mike Baillie (QUB). ...

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• Armagh Observatory
• J.G. Doyle, Research Astronomer

Databases (NSDC) of the Natural Planetary Satellites. ... NSDC: Database of astrometric observations of Natural Planetary Satellites . ... They are thoroughly looking for observations in different sources, creating their owndatabases which are then mostly inaccessible to other researchers. ... In the file "content" with explications, the reference is given to the data source as well as the bibliographic reference. ... Data sources. ... Why a specific bibliographic database for Natural satellites? ...

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home education > activities . SEARCH ASP SITE: Match ALL words Match ANY word . ... Astronomy . ... This classic activity by Dennis Schatz asks students to invent a more-or-less plausible life form that could survive on one of the moons and planets in our solar system. [a] . ... Good as far as it goes, but fails to point out a crucial difference with the real world: on the planets, the impacting bodies explode making craters much bigger and rounder than the ones the students will obtain. [m,h] . ...

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• ASP: Using Multicultural Dimensions to Teach Astronomy
• ASP: What If the Moon Didn't Exist?
• ASP: Cosmic Collisions

... A detector map is used to provide a grid of positions over which to calculate and flux weight the ARF. The default detector map is 'flat' which has a weighting of 1.0 for each detector map pixel and is rectangular having sides which just encompass the region specified in the DSS. Only detector map pixels falling within the source region are included in the ARF calculation, e.g. for a circular source box, the pixels in the corners of the detector map will be ignored. ... flat : . ...

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• Procedure

... In order to compare the number of different evolutionary stages obtained and X-ray luminosity of the chosen X-ray sources with the observed galactic values we use the sum of C/O+O/C , where C and O are the calculated and observed values of a given binary type, respectively. If we make comparison for a number of different binary species (for example, we compare the number of CV, number of X-ray pulsars,   total X-ray luminosity of LMXB, etc.), we write this criterion in the form: . ...

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• Initial Distributions of Binary Parameters
• Nomenclature
• Effect of sources evolution on

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• Extinction properties (transmitted radiation)
• Database of Optical Constants -- Level: welcome
• Kholtygin, Astrophysics (2000)

As it is in Ephemerides task, O–C can be calculated with different accuracy. ... It presents three modes of accuracy. One can calculate position of a minor planet by the formulae of elliptic motion starting from the fundamental set of elements for given minor planet. ... Also there is possibility to calculate positions taking into account perturbations from different sets of perturbing bodies by numerical integration ( Integration mode). ... Accuracy of integration is equal to 10**(–10) AU. ...

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• AY (preface)

... User Guide ] Task: colden Purpose: calculates column densities for linear molecules Categories: map analysis COLDEN is a MIRIAD task to calculate column densities. ... Key: method Three possibilities: (1) Give one optically thin transition and the kinetic temperature (Assumes tau=0). ... Default=1. Key: in1 The first input image contains the most abundant isotope (e.g. 12CO). ... No default Key: in2 For method 1, give the kinetic temperature in the first plane. ... Key: cut Two values. ...

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• Doing lengthy calculations from a GUI
• Weighting
• Reducing 3-mm ATCA observations

... Three different techniques for averaging have been introduced. ... The average functions mentioned above will normally produce a result frame whose world coordinates are the intersection of the father frames' world coordinates. ... Averaging statistically consistent values --- љ This command differs somewhat from the purely mathematical functions of the previous two commands in the sense that it tries to anticipate some of the astronomical content of the input data frames. ...

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• XWindow display
• Alternative construction
• Airmass Calculation

... We cannot use for this purpose equivalent widths and profiles of HI lines (well known criteria of atmospheric conditions for normal supergiants), since these lines are strongly distorted in the spectrum of IRAS04296 as seen in Fig. ... Figure: Upper: iron abundance FeI (circles) and FeII (crosses) calculated for IRAS04296+3429 with model parameters , and using lines with different excitation potentials EP of a low level; bottom: the same as a function of the equivalent width W . ...

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• Work Scan Program + Data Viewer (IDL widget)
• Emission molecular bands
• Discussion

One of my on-going research interests concerns the dust shells of proto-planetary nebulae or PPNs (also called pre-planetary nebulae, transition objects, and post-AGB objects in the literature; the latter term also applies to a wider selection of objects such as RV Tauri stars), especially the carbon-rich ones that show the unidentified "21 micron' emission feature. ... I am working to find a complete sample of proto-planetary nebulae in these satellite galaxies from the millions of detected stars. ...

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• Spectroscopy of Planetary Nebulae
• Results and Discussions
• Herschel Images and Results for the Magellanic Clouds

To main of Laboratory . The research work and design of optical and optical-electronic devices are carries out by laboratory staff: . ... Lens: . ... In the layout 1 prism systems perform functions of dispersive element, corrector of aberrations, optical reducer. ... Spectral range 200 - 400 nm; . ... Back Forward . ... The main corrector's function are compensation of field aberrations of the main spherical mirror of a telescope (diameter of 600 mm, f'=1200 mm) and increase aperture ratio. ...

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. ATMOSPHERIC INFLUENCE ON THE DIFFERENT RADIO-ENGINEERING . SYSTEM FUNCTIONING . The calculations of the atmospheric impact on terrestrial and satellite communication links with frequencies above 10 GHz using the ITU-R data bank. The correction of the Earth cover optical images obtained from the satellite/ . The Earth atmospheric influence on the radiowave propagation parameters in wide frequency range (from SLF to UV). Contact e-mail: . Pozhidayev Victor, Ph.D - vic@cplire.ru . © IRE RAS 1996-20 11

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• Project 4 - RFBR - Stepantsov, Determination of the space anisotropy of order

... Table 1: Acceptable temperature difference Invar36 0 .0 5 C А (the CTE was selected as 0.7 for the FEA) Stainless Steel 304 0.002 CА(the CTE was selected as 17.2 for the FEA) Aluminium6061 0.0015 CА(the CTE was selected as 23 for the FEA) (2) Analysis of the temperature gradients of the mount generated by an ambient temperature difference of 0.5 CА on both sides of the mount Invar , S.S. or Al ... Stainless steel material is added to Table 4 and 5 for comparison with Invar. ...

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• http://www.mrao.cam.ac.uk/~kjbg1/lectures/lect5.pdf
• Limits on Phase Correction Performance Due to Differences Between Astronomical
• Computing dispersive atmospheric delay with AATM Bojan Nikolic web pages (r.

Patterns of calculated concentrations by pollutant for different receptor territories corresponding to stations (furthest down the picture) and POs (the remainder). While all patterns are qualitatively similar, there are marked quantitative differences between territories. The pollutants go along the abscissa in the following sequence from left to right: CO, NO, NO 2 , NOx, O 3 , PM10, SO 2 , benzene, toluene, formaldehyde, xylene, Cd, Ni (the last four are meteoparameters). ...

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• Magnetospheres other than Ours
• Coordinate systems [Oulu]
• Radar aurora [Oulu]

The following files list line and continuum emissivities from the Arcetri Spectral Code. ... File format (html): File format for the continuum files . ... File format (html): File format for binned line emission files Line emission - The emissivity is given for individual transitions greater than 10 -31 phot cm 3 s -1 Choose the electron density: Ne = 10^2 Ne = 10^3 Ne = 10^4 Ne = 10^5 Ne = 10^6 Ne = 10^7 Ne = 10^8 Ne = 10^9 Ne = 10^10 Ne = 10^11 Ne = 10^12 Ne = 10^13 Ne = 10^14 . ...

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• APOD: 2001 January 23 - Spherical Planetary Nebula Abell 39
• Difference between ELF and kernel file
• APOD: 2000 September 6 - Emerging Planetary Nebula CRL 618

. Figure 3. SOHO/EIT derotated 6-hour difference images of the 14 July 2000 event in four diverse-temperature lines 171, 195, 284, and 304 . For each line, the 13 UT heliogram is subjected to the suppression of the `snowstorm' produced by energetic particles, and only dimmings (i.e. structures of negative resulting intensity) are shown. Different appearance of the images is due to different exposure times.

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• Distribution of the analyzed SEPs with different >100 MeV proton fluxes (J100)
• Oct-Nov 2003
• The Basille Day 2000 Event

.

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• Astronomy HyperText Book: Stellar Evolution
• Intelligent Life in the Universe
• Lecture V.

... August 29, 1998 . Orion Star Colours . ... Explanation: What determines a star's colour? ... Red stars are cool, around 3,000 kelvins (K), while blue stars are hotter and can have temperatures over 30,000 K. Our own lovely yellow Sun's temperature is a comforting 6,000 K. Differences in star colours are dramatically illustrated in the above photo of the constellation Orion , made using a "star trail step-focus" technique . ... About APOD > . ...

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• APOD: November 21, 1996 - The Blue Snowball Planetary Nebula
• APOD: 2014 May 30 - Planetary Nebula Abell 36
• APOD: 2007 February 15 - Planetary Nebula NGC 2440

Next: Front End Construction Up: Minutes of the 1st Previous: Minutes of the 1st . ... Calculated system temperature: 25-26K at 1525 MHz, 29-30K at 1375 MHz and 34-25K at 1225 MHz. ... Calculated G/T - again, center pixel better . ... Multi Beam Sky Footprint: Separation 2 beam widths between individual beams . ... Calculated Beam Comatic Level about 8 dB . ... German . ... Slide 1.9 shows calculated T sys with 2 points for each frequency; one is for the center beam and other is for the outside. ...

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• S2 S and D
• Different types of HVCs in different environments?
• radar