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1. Feature enhancement: normalizing
Next: Feature enhancement: local Up: No Title Previous: Feature enhancement: filtering . ... As a result, a common magnitude scale (contour lines on the maps above, or color scale on Fig.1) will poorly display the short-duration events in a signal. Normalizing each line of the map (fixed duration) so it has unit variance (in effect dividing the energy map by the mean energy spectrum) at each duration restores more details of small-scale activity (Fig. ...
[ Сохраненная копия ]  Ссылки http://crydee.sai.msu.ru/~vab/Wavelet.rsc/Tutor.dir/node20.html -- 3.2 Кб -- 12.04.1998
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2. The AstroStat Slog Blog Archive [ArXiv] component separation methods
... Archives . ... The PCA and ICA is used for separating mixed components with some assumptions. ... The need of source separation methods in astronomy has led various adaptations of decomposition methods available. ... I rarely come up with a paper which gathered and summarized component separation methods applicable to astronomical data. In that regards, the following paper seems useful to overview methods of reducing dimensionality for astronomers. [arxiv:0805.0269] . ... Chandra Blog . ...
[ Сохраненная копия ]  Ссылки http://hea-www.harvard.edu/AstroStat/slog/groundtruth.info/AstroStat/slog/2009/arxiv-component-separation-methods/index.html -- 23.2 Кб -- 01.03.2014
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3. Solar Physics
... 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. ...
[ Сохраненная копия ]  Ссылки http://space.univ.kiev.ua/courses/fiz_son_e.html -- 6.3 Кб -- 23.02.2005
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4. APOD: April 3, 1996 - A Lucky Lunar Eclipse
... April 3, 1996 . A Lucky Lunar Eclipse . ... Explanation: Tonight's full moon would normally washout the spectacle of Comet Hyakutake's lovely tail , even for those far from light polluted skies. ... Lunar eclipses are caused when the Moon passes through the Earth's shadow . ... Latest Comet Hyakutake images: APOD Hyakutake Archive , JPL , Fayetteville Observer-Times , NASA's Night of the Comet , ICSTARS , Jerry Lodriguss , ScienceWeb , Crni Vrh Obs. ... Archive | ... About APOD | ...
[ Сохраненная копия ]  Ссылки http://www.sai.msu.su/apod/ap960403.html -- 5.5 Кб -- 02.10.2012
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5. Thermal and Nonthermal Infrared Emission from M87
We discuss images of M87 from 3.6 to 160 ЮМm obtained with Spitzer. As found previously, there is an excess in the far-infrared over a simple power-law interpolation from the radio to the resolved nonthermal features in the mid-infrared and optical. We show that this excess is most likely due to warm dust in the galaxy itself and that the properties of this emission component are similar to the far-infrared emission of normal giant elliptical galaxies. ... ADS ] . ADS Citation Query . ...
[ Сохраненная копия ]  Ссылки http://www.stsci.edu/~kgordon/papers/2007ApJ...655..781S.html -- 3.8 Кб -- 21.01.2016
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6. If neutron stars don't produce energy from fusion, like normal stars, how can
... Star Atlas . ... stars . ... If neutron stars don't produce energy from fusion, like normal stars, how can they shine in visible light? ... Although it is true that neutron stars have, for the most part, consumed all their internal thermonuclear fuel, they tap into other energy sources to produce light. Indeed, neutron stars are remarkably "resourceful" and employ a variety of physical mechanisms to make themselves visible.A newborn neutron star is incredibly hot ? ... Atlas of the Stars . ...
[ Сохраненная копия ]  Ссылки http://www.astronomy.com/magazine/ask-astro/2005/03/if-neutron-stars-dont-produce-energy-from-fusion-like-normal-stars-how-can-they-shine-in-visible-light -- 63.4 Кб -- 10.04.2016
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7. XWare > APOD
... Normally hidden by a thick, hazy atmosphere, tantalizing features on Titan's surface appear in this false-color view. ... Go outside tonight and see the total lunar eclipse. ... Here is one of the largest objects that anyone will ever see on the sky. ... A closer look at the Eagle Nebula, however, shows the bright region is actually a window into the center of a larger dark shell of dust. Through this window, a brightly-lit workshop appears where a whole open cluster of stars is being formed. ...
[ Сохраненная копия ]  Ссылки http://www.astronet.ru/db/xware/apod.html?page=98&d=2007-06 -- 14.9 Кб -- 12.04.2016
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8. http://www.naic.edu/alfa/galfa/docs/galfacts_rfi.pdf
GALFACTS MEMO: # 10 ALFA RFI Saturation Problem J. S. Dever 20 Decemb er 2006 1 Overview Observations made with ALFA can be partially or completely lost due to strong RFI saturating a component in the receiver chain. ... A determination of where the saturation is occuring should be made, and the problem solved. ... 1 Radar RFI 1.35 1.3 1.25 Power 1.2 1.15 1.1 16750 16800 16850 16900 Time 16950 17000 17050 Figure 1: Band average plot for 135 seconds showing the effect of Radar RFI in the continuum. ...
[ Текст ]  Ссылки http://www.naic.edu/alfa/galfa/docs/galfacts_rfi.pdf -- 45.4 Кб -- 25.12.2006
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9. Time series analysis in the frequency domain
Next: Analysis in the Up: MIDAS utilities for Previous: Fourier analysis . For the detection of smooth signals, e.g. sinusoids, use either SCARGLE/TSA or AOV/TSA with bins. ... SCARGLE/TSA -- . Scargle sine model: This command computes Scargle's (1982) periodogram for unevenly spaced observations x . ... In this way, the command can be used to perform a CLEAN-like analysis manually by removing individual oscillations one by one in the time domain (see Roberts et al. ... AOV/TSA -- . ...
[ Сохраненная копия ]  Ссылки http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node253.html -- 10.2 Кб -- 23.02.1996
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10. Observations and Data Reduction
Next: Results & Discussion Up: Coronal Hole Diagnostics out Previous: Introduction . ... The dates of the observations discussed here, their locations, pointing, slit sizes and exposure times are given in BTDW. ... Line fits are given by the dotted line. ... An estimation of the errors in the derived parameters was obtained using the GA-derived parameters as an input for a ``classical'' IDL-CURVEFIT procedure (Peter, 1999; Peter & Judge, 1999). ...
[ Сохраненная копия ]  Ссылки http://star.arm.ac.uk/~ambn/312/node2.html -- 7.8 Кб -- 02.06.1999
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