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 (0)28 3752 2928 . ... The top panel shows an image of the Sun in the O VI 1032 line obtained on 1996 June 7 by the SUMER instrument, with the three regions for which O VI 1032 and 1038 line intensities were determined from SUMER spectra labelled as A, B and C. The remaining panels show plots of the measured I(1032)/I(1038) ratios for each region. ... A similar effect can take place between lines of differing optical depth. ...

... Many of these radi HII regions lie beyond the range of optical detection, at distances exceeding several kpc; they thus provide a comprehensive coverage of the southern HII regions in the Galaxy over the longitude range 210 to 360^o and consistute a vital data base for the study of galactic structure. ... C Caswell (1972) . ... In column 16, "V", or a specific nebula name, denotes the presence of a visible optical counterpart, and "A" indicates the absence of an optical counterpart. ...

... 2002 July 18 . Sunspot Region 30 . Credit: MDI , SOHO , ESA , NASA . Explanation: The solar active region designated number 10030 (or simply region 30) 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 . ... About APOD | ... NASA Technical Rep.: ...

Herschel Guaranteed-Time Key Projects . at Arcetri . ... Both regard spectroscopic observations of different classes of star-forming regions in the Galaxy. WISH: WATER IN STAR-FORMING REGIONS WITH HERSCHEL . ... HS3F: HERSCHEL SPECTRAL SURVEYS OF STAR FORMATION REGIONS . ... Since gas cools mostly by line emission, knowing what molecules are formed and which lines are emitted in the different regions at different times is mandatory to understand the gas thermal balance. ...

... Science Users Information > Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Planetary Nebulae and HII regions in the Elliptical Galaxy NGC 5128 . ... NGC 5128 is the closest example of a giant early type (elliptical or S0) galaxy. Although often dubbed as a peculiar elliptical galaxy since it has a dust lane with recent star formation and an active galactic nucleus, the majority of early type galaxies have similar structures as revealed by recent surveys. ...

At Arecibo we have a variety of optical instruments that we use to study terrestrial airglow emissions. ... As a complement to the airglow instrumentation we also maintain a set of optical instruments, called lidars, used for "active" remote sensing of the atmosphere. That is, we generate our o