GEOMAGNETIC POLAR CAP (PC) INDEX The PC-index is a fifteen-minute index for magnetic activity in the (P)olar (C)ap. ... The PC-index is based on an idea by Troshichev et al. (1979) and developed in papers by Troshichev and Andrezen (1985), Vennerstrom and Friis-Christensen (1989), Troshichev et al. 1988), Vennerstrom (1991), and Vennerstrom et al. 1991). ... Data are present for the following years: Thule: 1975-CURRENT: Files are monthly, zipped in an annual file. ...

Storm) Sudden Commencements ( ssc ) are defined by an abrupt increase or decrease in the northward component of the geomagnetic field, which marks the beginning of a geomagnetic storm or an increase in activity lasting at least one hour. ... Before January 1966 these reports were published periodically in Journal of Geophysical Research. ... Beginning with December 1970, these data are published monthly and, thus, are based on fewer reports and differ slightly from similar data published previously. ...

Classroom Activity: Making a Rainbow . ... When white light from the Sun or a light bulb passes through a prism, the light splits into its component wavelengths. ... Red, blue, green colored filters - if possible, cut 1x4-inch pieces of the filters for each student . ... Many students have the misconception that filters somehow dye the light a certain color. ... Younger students can draw the rainbow and make up a mnemonic for remembering the order of the colors (such as, ROY G. BIV). ...

... Modules . ... Classes . Files . ... File List . File Members . components . ... National Radio Astronomy Observatory 00023 //# 520 Edgemont Road 00024 //# Charlottesville, VA 22903-2475 USA 00025 //# 00026 //# $Id: ComponentModels.h 20691 2009-07-14 03:13:54Z Malte.Marquarding $ 00027 00028 #ifndef COMPONENTS _ COMPONENTMODELS _H 00029 #define COMPONENTS _ COMPONENTMODELS _H 00030 00031 # include components / ComponentModels /ComponentType.h 00032 00033 # include components / ...

Extended time series of Solar Activity Indices (ESAI) is database including observational, synthetic and simulated sets to study Solar magnetic field variations and their influence on the Earth. ESAI extend the ordinary lengths of some traditional indices of solar activity: sunspot areas, Wolf numbers (equatorial component of magnetic field of the Sun), polar faculae numbers (polar component), mean latitudes, N-S asymmetry of hemispheres (location of activity). Series . ...

Geomagnetic storms and substorms are a natural hazard similar to hurricanes, floods etc. ... Solar and geomagnetic activity also probably influences the Earth's climate and human health. ... Under southward directed IMF the Earth's magnetosphere is open to input from the solar wind flow. ... Since practical importance of solar wind measurements was recognized, a number of approaches was developed for prediction of the geomagnetic activity basing on the solar wind data. ...

... 4 июня 2013 (Solovyov, Samokhvalov, et al) New Eclipsing Variable Star with Delta Scuti Component . 24 марта 2013 (Solovyov, Samokhvalov, et al) New Variable Stars at the Borderline of Ophiuchus and Serpens . ... 9 марта 2011 (Solovyov, Samokhvalov, et al) USNO-A2.0 1425-04252279: a New Eclipsing RS CVn Star with Spot Activity of Both Components . ... 23 марта 2009 (Solovyov, Kryachko, et al) New UV-type Variable Star USNO-B1.0 1101-0097009 . ...

... Contacts . 2012: . ... We refined the fundamental parameters of the components, the orbital periods, and the conditions of photospheric heating of the secondary component by the ultraviolet radiation of the hot component. ... The observations of the star clusters associated with ultra-luminous x-ray sources (ULXs) in four galaxies on the 6-meter and VLT telescopes have shown that all the ULXs are located within 200pc of very young star clusters (younger than 5 million years). ... Archive . ...

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The IAA RAS . ... Academic senate . Dissertation council . Council of young scientists . ... International collaboration . Memberships in international organisations . ... Awards and honors . Government awards . The IAA RAS Medal . ... Astronomical Yearbook . Nautical Astronomical Alamanac . Naval Astronomical Yearkbook . ... The IAA RAS journal . ... Council of yound scientists . ...

Kholtygin A.F., Burlakova T.E., Fabrika S.N., Valyavin G.G., Yushkin M.V. Microvariability of Line Profiles in the Spectra of OB Stars: delta Ori A . ... We have studied variability of the spectral lines of the OB star delta Ori A -the brightest component of the delta Ori triple system. ... However, some of the variable features go outside the band, presumably due to either imhomogeneities in the stellar wind from .Ori Aa1 or non-radial pulsations of the weaker components of the system, Aa 2 or Ab. ...

... 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 adap