. Next: Image Manipulation Up: Point Response Functions Previous: On-Axis Point Response Functions . Three series of ROSAT calibration data are provided for general use. They provide examples of off-axis PRFs, and are situated in a directory with PROS alias xrcal . xecal has Einstein data. The list files in the directory provide a key to the data files (also given in the help files discussed in On-Axis Point Response Functions ). rsdc@cfa.harvard.edu . 1998-06-10

... HST . ... Data . ... HST Overview . Overview . ... Cycle 24 Announcement . ... Retrieving HST Data . ... Instruments . ... Grism Spectroscopy . ... UVIS Flats . ... Instrument Handbook . Data Handbook . ... The Wide Field Camera 3 (WFC3) is a fourth-generation UVIS/IR imager aboard the Hubble Space Telescope (HST). WFC3 was installed in May 2009 during HST servicing mission 4, and replaces the Wide Field Planetary Camera 2 (WFPC2). ... ISR 2016-09: WFC3 Cycle 22 Proposal 14007: UVIS Gain . ...

IBIS Data Analysis . ... IBIS . ... Flat Fielding - Introduction . The images obtained by IBIS will have intensity variations across the field of view that are not due to the solar image, but rather caused by instrumental effects that alter the observed intensity in each point of the field of view. ... IBIS Flat Fielding Techniques . ... Therefore, it is desirable to obtain the flat field measurements center on a point along the equator near the heliographic center of the solar disk. ...

... The improvement will be more pronounced in our crowded Wide Field Camera (WFC) images, and may be increased further through use of a more sophisticated method of combining the individual dithered images. Our analysis allows us to check for point spread function shape variations in the HST Planetary Camera (PC) field. ... In crowded field images, we are deriving information about the faint end of the luminosity function (LF) from the texture of the image background. ...

I-GALFA Survey Fields . ... Most I-GALFA fields are observed by ``nodding'' the telescope north and south along the meridian to trace out a zig-zag pattern on the sky as the Earth rotates. ... The I-GALFA fields fill the AO DEC range and overlap with each other by 20', with one field 3 degrees wide at the zenith and four others 9.3 degrees wide covering the rest of the survey. ... The LST range of each field is shown in blue. ... Field . ... The I-GALFA fields are shown in Galactic coordinates below. ...

Organisers: Philippe Lebacque (Laboratoire de Math matiques de Besan on ) , Michael Tsfasman (CNRS, Laboratoire Poncelet, Institute for Information Transmission Problems) , Alexey Zykin (Laboratoire Poncelet, State University Higher School of Economics, IITP) . ... General Information . ... Let A be an abelian surface over a finite field k. The k-isogeny class of A is uniquely determined by a Weil polynomial f_A of degree 4. ... Poncelet Laboratory web page . ...

... The are two main sources of magnetospheric electric fields. The other is the solar wind related, dawn-to-dusk directed ("convection") field, and the other is the co-rotation electric field related to the rotation of the Earth along its spin axis. The electric fields have a strong effect on the drift paths of the magnetospheric plasma . ... The energetic particles, following the magnetic drifts more readily, are also affected by the convection field. ... Space Physics Text Book of Oulu ...

... Summary of reduced ISAAC fields . ... This data release includes eight fully reduced VLT/ISAAC fields in J,H,K s bands covering 50 arcmin 2 of the GOODS region in the Chandra Deep Field South (CDFS). ... 8 ISAAC fields) . ... The 8 ISAAC fields which are part of this data release are superimposed onto a SOFI image (J+K) (part of a previous EIS data release). ... In one case (GOODS field 11/J-band), for which not enough standard stars were available, the ZP was boostrapped from previous SOFI/EIS data...

SAS home . ... EPIC background spectra are normally extracted from regions of the observation field-of-view, once "contamination" due to individual discrete celestial sources has been removed. ... In order to cope with this situation, blank sky event lists can be downloaded from the XMM-Newton Science Operations Center web site. ... It is in principle possible as well to extract background spectra from blank field event lists, if the spectrum accumulation regions are defined in sky coordinates. ...

... disprm Struct Reference . ... Returned ) Pointer to the first element of an array of int* containing pointers to the first elements of the arrays of integer distortion parameters for each axis. double ** disprm::dparm . Returned ) Pointer to the first element of an array of double* containing pointers to the first elements of the arrays of floating point distortion parameters for each axis. int disprm::i_naxis . ... Returned ) The number of distortion functions. struct wcserr * disprm::err . ...

... Bit Fields . Bit Fields: Practical Example . ... NOTE: The combination of pointers and bit-level operators makes C useful for many low level applications and can almost replace assembly code. ... To illustrate many points of bitwise operators let us write a function, Bitcount , that counts bits set to 1 in an 8 bit number ( unsigned char ) passed as an argument to the function. int bitcount(unsigned char x) { int count; for (count=0; x != 0; x>>=1); if ( x & 01) count++; return count; } . ...

... Listed below are questions submitted by users of "The Exploration of the Earth's Magnetosphere" and the answers given to them. ... The ones included below are either of the sort that keeps coming up again and again--the danger of solar eruptions, the reversal of the Earth's magnetic field, etc.-- or else the answers make a special point, going into extra details which might interest other users. ... Radiation Belts and Manned Space Flight . ... Capturing the Energy of the Solar Wind . ...

SINGULAR POINTS IN THE SOLAR CHROMOSPHERE . ... In the structure of the solar chromosphere, containing information on the configuration of the magnetic field, we have found and identified all the main types of the singular points ( see Fig. 1 ), which are known as inherent features of the 2-D vector field. ... The main types of the singular points are the node, the focus, the center, and the saddle. ... Singular point of the focus type in the solar chromosphere. ...

... Astronomers of the SAO together with an international group of scientists have proposed an explanation to the long-standing mystery of why magnetic fields are more common amongst cool white dwarf stars than amongst young and hotter ones. ... As the result magnetic white dwarfs demonstrate excess in their frequencies in the temperature range below 14000K. The authors also show that the strongly magnetic white dwarfs are of the oldest stars of the Galaxy originated from intermediate-mass relic stars. ...

... Current APO Weather . ... Search Site . ... Information for New Users . ... Technical Staff pages . Night Logs and Mailing Lists (maintained by APO) . ... Technical Documents and Database Search . ... Observer's Documentation and Procedures . ... Problem Reporting and APO Technical Documents Database Search . ... APO Drawing/Document Management Procedures . ... APO Technical Documents Database Search . Home Astrophysical Research Consortium . ... Mail Lists (maintained by APO) . ...

... A second method to account for illumination problems in the flat fields is to remove the large scale pattern from the flat field itself. This is useful if there are no reasonable blank sky calibration frames and the astronomical exposures are evenly illuminated but the flat fields are not. ... Obviously, after having obtained the illumination corrected flat field it is reasonable to replace the original flat fields by the corrected flat fields in the reduction table. ...

... FIELD | ... METHOD . ... java.lang.Object ij.plugin.filter.MaximumFinder . ... public class MaximumFinder . ... 32768 pixels in width or height version 01-Nov-2009 Bugfix: extra lines in segmented output eliminated; watershed is also faster now Maximum points encoded in long array for sorting instead of separete objects that need gc New output type 'List' . ... static int . ... The plugin is inferred from ImageJ by this method . ... int . ... Field Detail public static final int SINGLE_POINTS . ...

THE MAIN FIELDS OF MY INTEREST ARE RELATIVISTIC GRAVITATION AND COSMOLOGY . ... The first one is cosmology more precisely the anisotropy of the CMBR (Cosmic Microwave Background Radiation) . In the last paper devoted to the mapping of the CMBR and search for anisotropy we announced the observation of the signal (Strukov et al., ... We discuss the opportunity of explanation of the current observational data in the framework of this hypothesis. ... Some of my papers I devoted to the phenomena. ...

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... Bojan Nikolic web pages home . ... I've uploaded a new version the "bnlib" library that amongst other items contains the code to generate very large simulations of turbulent fields. ... http://www.mrao.cam.ac.uk/~bn204/alma/memo-turb.html#Current+version+of+library%3A+V1.3 . ... http://www.mrao.cam.ac.uk/~bn204/publications/2008/ALMASim08.pdf . Please enable JavaScript to view the comments powered by Disqus. blog comments powered by Disqus . Copyright 2012, Bojan Nikolic feedback welcome ...