... 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. ...

... As a result of BTA observations of 23 chemically peculiar stars with strong magnetic fields, it was found that in 22 of them the longitudinal magnetic field, measured from the hydrogen line cores are considerably lower (by about 1/3) than the value measured from metal lines in the same spectra. ... New approaches need to be developed in order to interpret the data. ... The Zeeman spectrum of a star with a strong magnetic field, 53 Cam. ...

Next: Instrument Response Correction Up: Echelle Spectra Previous: Resampling and checking . ... This effect is constant for a given setting and it can be effectively corrected by dividing the object image by a flat--field exposure taken with the same instrument configuration. ... The flat--field correction is done with the command COMPUTE/IMAGE , this command divides the background subtracted OBJ by the normalised flat--field as computed by the command FLAT/ECHELLE . ...

... This chapter deals with analyzing source positions and spatial structure and with image calibration. ... See Table 6.1 for the dimensions of ROSAT and Einstein images: . ... ROSAT . ... Einstein . ... imcnts* - Find background subtracted counts for a point source . ... imexamine* - General analysis of image containing many sources . ... Radial Profiles and Projections . imcnts* - Radial Profile of an extended source at the field center . ... imcnts* - Azimuthal profile of an extended source . ...

... 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 . ...

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. ...

... 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. ...

... Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point along the field line (drawing below). Field lines converge where the magnetic force is strong , and spread out where it is weak. ... Exploration" home page (index) Glossary . ...

... Laboratory of Real Structure of Crystals . ... Microscopic mechanisms of magnetization reversal of nanostructured magnetic materials (multilayers, spin valves, etc.) ... Dynamical properties of domain walls, Bloch lines and points in ferromagnetics. ... Nonlinear excitations of spin systems localized in domain walls as well as of soliton-like spin waves and their evolutions. Dynamical properties of domain walls in ferroelectrics. ... ISSP RAS © 2006 All rights reserved ...

... Files with sunspot magnetic fields data ============================================== Column Format Description ______________________________________________ 1-2 I2 Day of month 3-4 I2 Month (numerical) 5-8 I4 Year 9 A1 Blank 10-13 I4 UT in hhmm 14 A1 Blank 15-19 A5 Sc - atmospheric flutter in arc sec 20 A1 Blank 21-25 A5 S - quality of the Sun image 26-27 A2 Blank 28-31 A4 Number of sunspots (numbering from unit every day ) 32 A1 ...

Blackholes2 Forum Message . ... Post . ... A Field Does Not Contain Energy? ... Post Message | ... Here are two sites of many which use rest mass terminology. http://www.iop.org/EJ/abstract/0026-1394/41/5/S04/ . ... This site refers to the energy contained in a static gravitational field. http://www.ias.ac.in/currsci/mar25/articles27.htm . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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. ...

... Other Characteristics of the Sun: Variability of Rotation, Magnetism, Chemical Structure, Planetary System. ... Methods of Solar Magnetic Fields Measuring: Visual, Photografic, Photoelectric. ... Empiric Datas of Magnetic Fields in Photosphere, Chromosphere and Corona. ... Characteristics of Magnetic Field in Balanced Force Tubes by Potential and Forceless Field. ... Phenomenons in Active Region (Magnetic Field, Spots, Torches, Solar Prominences, Flares, Discharges. ... Magnetic Fields in Flares. ...

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 . ... To a given field K one can associate some "structure", e.g., the isomorphism class of the automorphism group of a "universal" extension of K, possibly endowed with additional data. ...

Origin & Evolution of Magnetic Fields Ellen Zweibel zweibel@astro.wisc.edu Depar tments of Astronomy & Physics University of Wisconsin, Madison and Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas Origin & EvolutionofMagnetic Fields ­ p.1/17 Importance of the Problem A cosmological problem. ... Interplay with ISM studies Structure of galactic fields on large & small scales? How do fields affect turbulence? ... Origin & EvolutionofMagnetic Fields ­ p.7/17 We Also Know.. ...

... Chandra | ESO | ... Field selection . ... Color composite image of the Chandra Deep Field South of 940 ks (pixel size = 0.984 arcsec, smoothed with a s =1 arcsec Gaussian). ... The Chandra Deep Field South (CDF-S) is one of the deepest observations obtained with the X-ray Chandra satellite, which stared at the same path of the sky for 11 days. ... ESO press release on March 13 , 2001 . ... APOD : The Chandra Deep Field South has been the Astronomical Picture of the Day on March 28, 2001 . ...

Main Page Data Structures File List Data Fields Globals . Data for OI_WAVELENGTH FITS table. ... int . ... char . ... float * . eff_wave . ... eff_band . Data for OI_WAVELENGTH FITS table. int _oi_wavelength::revision . char _oi_wavelength::insname[FLEN_VALUE] . int _oi_wavelength::nwave . float* _oi_wavelength::eff_wave . float* _oi_wavelength::eff_band . The documentation for this struct was generated from the following file: . ...

... A reconstruction method of 3D vector velocity field (three components of velocities) of gas in disks of spiral galaxies from observed line-of-sight velocity field is proposed. This method is based on Fourier analysis of observed velocity field. ... The knowledge of velocity field in spiral galaxies allows to clarify the nature of the galactic structures and mechanisms of their formation. ...

... Solar Wind . ... During a total eclipse of the Sun, when for a few minutes the Moon completely covers the Sun's face, a glow appears around the darkened Sun--the solar corona, the Sun's outermost atmosphere. ... Such high levels of ionization require the atoms to be buffeted around by extremely high temperatures, around 1,000,000 C (1,800,000 F). ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona...