Astronomy Picture of the Day . Sunspot Region 30 . ... Credit: MDI , SOHO , ESA , NASA Explanation: The solar active region designated number 0030 is now appearing on the visible hemisphere of the closest star . ... The panels above were recorded July 15, 16, and 17 (top to bottom) by the MDI instrument on the space-based SOHO Observatory as the solar rotation slowly carried the large, dynamic sunspot group across the Sun's nearside . ... Publications with keywords: Sun - sunspot - active region . ...

... Parameter Mand Type Default Constraints set yes string The input OM OSW source list srcnumber yes integer The number of the source in the OM OSW source list srcradius yes real 3 The size of the source extraction radius : in FWHM of the source PSF, if it is positive, and in xed pixels if it is negative bkginner yes real 1 The inner radius of the background extraction ... The output region les could be based on the input root plus the source number. ...

... The TESIS is a set of solar imaging instruments developed by the Lebedev Physical Institute of the Russian Academy of Science, and launched aboard the Russian spacecraft CORONAS-PHOTON on January 30, 2009. The main goal of the TESIS is to provide complex observations of solar active phenomena from the transition region to the inner and outer solar corona with high spatial, spectral and temporal resolution in the EUV and Soft X-ray spectral bands. ... Solar activity hits a new low . ...

Creating 3D Data Cubes ====================== Description: Combine dithered long-slit spectroscopic observations to produce 3D data cubes, i.e., spatial maps or images (2D) with a third dimension that is a function of wavelength. ... Assumptions The paucity of spatial information in an FOS or STIS spectral data set that could be used to empirically align and combine separate observations makes it essential that the data headers contain accurate spatial information. ... Identify suitable data sets. ...

... The x-ray spectral analysis consists of a comparison between the observed pulse height spectrum and a pulse height spectrum calculated using a given spectral model. ... To obtain the spectral parameters for an x-ray source, several steps need to be followed. For each source: . ... obtain the best fit parameters for a spectral model - repeated for each model of interest . obtain a 1-D or 2-D grid of values around the best fit values - this can be done for as many models as desired . ...

... We report on our ongoing project ``Infrared Study of HII Regions Associated with Small Clouds.' ... These IR data, combined with optical imaging (which will be obtained from the IAC-80 telescope), IRAS survey maps, and existing CO observations of the associated clouds, will allow us to undertake a detailed investigation of the gas-to-dust mass ratio, initial mass function and the star-formation efficiency in these complexes. ... CHECKPSF: check the PSF (Point Spread Function) model, . ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44