The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

... The resolution element (one diode) for GHRS was matched to the width of the SSA. ... A delta-function spectra line observed through the SSA can be described by a Gaussian with a FWHM of about 0.925 diodes which is about 3.7 quarter-stepped pixels. ... Since an SSA spectrum is the best resolution we can obtain with GHRS, it is useful to describe the LSA LSF in terms of the SSA PSF. Consequently, we have measured the LSA-SSA differential LSF for a number of gratings and at a sample of wavelengths. ...

Start Data Acquisition - Selected Wavelengths - 22/Apr/2014 16:21:46.647 Observation Type - Grid Images - 22/Apr/2014 16:21:46.662 22/Apr/2014 16:21:48.700 Begin Iteration #1 of 2 - Number of Frames : 17 - 22/Apr/2014 16:21:48.714 Filter : 6563 (Position 3) | ... Acquisition Time : 22/Apr/2014 16:21:48.839 | ... ExpTime (sec) : 0.030 | Stokes : I Filter : 6563 (Position 3) | ... Stokes : I Begin Iteration #2 of 2 - Number of Frames : 17 - 22/Apr/2014 16:21:51.321 Filter : 6563 (Position 3) | ...

... epiclccorr (epiclccorr-1.0.8) [?? ... epiclccorr will treat all these corrections individually, developing and designing specific algorithms to correct the Relative Corrections . GTIs correction will be calculated using the GTI extensions located in the time series file, if any. ... Exposure correction is the time inside each frame where the CCD is taking data correctly (no counting or MIP problems). ... This correction will be calculated using the Live Time and Frame Time values of each mode. ...

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... The concepts of Fourier frequency and wavelet duration are obviously related. ... Among many sensible definitions, we chose to require that the peak of the wavelet mean spectrum should be matched with the singularity of the Fourier transform of the cosine wave. Then, it can be shown that the frequency of the cosine is related to the wavelet duration by the relation . ... The ambiguous definition of the duration of an event is common to the sizing of any object of irregular shape. ...

... 38.4, THAT GIVES FOR 68 MONTHS (2014, SEPTEMBER) DEVELOPMENT CURRENT 24 CYCLES OF SOLAR ACTIVITY THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER W*sep. ... 15.5 ---------------------------------------------------------------------- Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 30.03 - 05.04.2015, Forecast on 06 - 13.04.2015, Carrington Rotation 2162 (27,93.03.2015) SUNSPOT-FORMING ACTIVITY OF THE SUN WAS AT THE AVERAGE LEVEL ALL DAYS EXCEPT APRIL, 3 WHEN LEVEL FELL TO THE LOW. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The wavelet power spectra for the mean seasonal and annual RH series: at 09:00 GMT, 1838-2008. The large panels show the power plotted against period (vertical axis) and epoch (horizontal axis). ... The mean seasonal and annual time series of RH at this site show only marginal evidence for a trend in RH since the 1880s, however there is significant decadal and multi-decadal variability, some of which appears to be cyclic. ...

. You can define a file or directory by its location in relation to your current directory . The pathname is given as / (slash) separated list of the directories on the route to the file (or directory) from your current directory. A .. (dot dot) is used to represent the directory immediately above the current directory. In all shells except the Bourne shell, the ~ (tilde) character can be used as shorthand for the full pathname to your home directory. Examples . Did You Know? .

... Let us first find out which way -- rise in spectral resolution with some loss in the S/N ratio or increase in the S/N ratio with a fixed spectral resolution -- is better for the purpose of reduction of equivalent width determination errors. ... N -- number of counts for 1 ? ... line equivalent width, . ... Thus if the spectral resolution is managed to be increased (i.e. to decrease )without loss in the number of counts falling at 1 ?, the equivalent width measurement error is then proportional to . ...

... SET/IRSPEC flat=.. ... SKYSUB/IRS . ... However, in SKYSUB/IRS you can avoid caring about the dark if -- and only if -- you use this command to make a straight subtraction (see last example of TUTORIAL/SKYSUB), in which case the dark frame is effectively not used. ... SKYSUB/IRSPEC . ... When using this mode remember to apply -- using the above command -- the same calibration to the object and to the standard otherwise you will not be able to run FLUX/IRSPEC. ... RECTIFY/IRSPEC . ... STANDARD/IRSPEC...

16may03 The hcorcal measured values: . ... The power levels during the measurements. ... The ratio of the other cals to the hcorcal: New diodes were installed on the cband system on 22apr03. On 25apr03 the cals were measured using absorber and tracking blank sky. ... After this the "other cals" were measured relative to the hcorcal while tracking blank sky. ... The ratio of the "other" cals was then computed relative to the hcorcal (see measuring cals on the telescope using sky and absorber ). ...

We investigate the relative importance of starbursts and active galactic nuclei (AGN) in nuclear activities of ultraluminous infrared galaxies (ULIRGs) based on chemodynamical simulations combined with spectrophotometric synthesis codes. We numerically investigate both the gas accretion rates (ARs; m acc ) on to supermassive black holes (SMBHs) and the star formation rates (SFRs; m sf ) in ULIRGs formed by gas-rich galaxy mergers and thereby discuss what powers ULIRGs. ...

... Atmospheric Extinction Coefficients at La Silla (from Geneva Observatory) . Differential atmospheric refraction . ... Precipitable Water Vapour and local Relative Humidity . Wind, Air Temperature, Dew Point and Relative Humidity Statistics, 2002 to 2006 (pdf) and seasonal, 1999 to 2007 (pdf) . ... Wind Velocity and gust at ground level (1998-2007) and at the tropopause level . ... Environmental Conditions at ESO Observatories (Trimestrial Reports, discontinued in 1999) . ...

UFO Forum Message . Forums: . ... Post . ... It Really Is Relative . ... Post Message | ... If you are on the Earth the moon does not rotate around its own axis. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... 05/09/2013 Galaxy Evolution over Five Decades - Cambridge 2013 Nuclear activity and environment Effect of environment on AGN is not completely clear yet. ... 05/09/2013 Galaxy Evolution over Five Decades - Cambridge 2013 Effect of the mass Mass slices ­ optical and radio AGN overall interaction one-on-one interaction relative location 05/09/2013 Galaxy Evolution over Five Decades - Cambridge 2013 Stratified study Stratifed study that considers several strata of mass. ...

Astronomy Picture of the Day . El Nino Water Rhythm . ... The large amount of warm water in the Pacific Ocean near the equator is causing unusual weather all over planet Earth . The above false-color images of Earth show the relative levels of warm water between normal (upper left) and the comparatively mild El Ni?o of 1995 - 1996 . ... Publications with keywords: Earth - weather - water - El Nino . Publications with words: Earth - weather - water - El Nino . ... Pantheon Earth and Moon . ...

... They are concerned with Attitude Control System of the spacecraft, satellite visibility from tracking stations, limits on the satellite autonomous operations during the orbit, and needs for auxiliary operations with the spacecraft. ... Among the operational constraints the most important one is the number of programmed slews per orbit, which determines the maximum number of radio sources to be observed during one orbit. ... System temperature (K) . ... Progress of the RadioAstron Project in Pictures...

... GCR and SCR are primary cosmic rays. 10-15 years after the discovery of cosmic radiation (1919) there emerged two main avenues of investigation in the physics of cosmic rays (CR): 1) nuclear - elucidation of the origin of elementary particles and nuclear interactions; and 2) astrophysical (space physics) - solution of the problem related to the origin and variations (changes in intensity) of CR. ... Besides, the CR flux in interplanetary space is, strictly speaking, not isotropic. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. January 13, 1998 . El Ni?o Water Rhythm . ... The large amount of warm water in the Pacific Ocean near the equator is causing unusual weather all over planet Earth . The above false-color images of Earth show the relative levels of warm water between normal (upper left) and the comparatively mild El Ni?o of 1995 - 1996 . ... About APOD > . ...