Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

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... Because of the Earth 's gravity, atmosphere is horizontally stratified (see, e.g., Kelley, 1989). Its structure can be organized by using the neutral gas temperature, as shown in the figure from mid-latitudes (note the logarithmic altitude scale). When going upward from the ground within the lowermost atmospheric region, troposphere, the temperature decreases up to about 10 km altitude (tropopause). ... Here the radiation also ionizes the neutral atmosphere, creating the ionosphere . ... 1989. ...

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• Oulu Textbook contents
• Aurora (Oulu)
• Ionosphere [Oulu]

... IONOSPHERIC DATA IN THE INTERACTIVE SPIDR SYSTEM . ... The Ionosphere The ionosphere is that part of the upper atmosphere where free electrons occur in sufficient density to have an appreciable influence on the propagation of radio frequency electromagnetic waves. ... These regions may be further divided into several regularly occurring layers, such as F1 or F2. ... E Region: The region between about 95 and 150km above the Earth that marks the height of the regular daytime E layer. ...

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... We study in this paper the effect of shock excitation of leaky and surface modes by the p-polarized electromagnetic wave incident on the rapidly ionized gaseous or solid layer. ... For example, if [pic] (solid density, multiple ionized plasma), the basic frequency [pic], [pic], [pic] we find, that the wavelength of leaky wave [pic] is in soft x rays band. ... If [pic] (low density gaseous plasma), the basic frequency [pic], [pic], [pic] we find, that the wavelength of leaky wave [pic] is in THz band...

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• The Sun--Introduction
• Le Soleil --Introduction
• Brief History Introduction

... Bojan Nikolic web pages (r. 329) . ALMA . ... These errors are due to the refractive effects of the Earth?s atmosphere, specifically due to the (tropospheric) water vapour. ... Making use of information on baselines this long will require very accurate calibration and correction of atmospheric phase errors. ... The design of the ALMA phase correction system is summarised in Nikolic et al 2013 . Introduction to phase correction for ALMA . ALMA Goals . ALMA Phase correction strategy . ...

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• Modelling absorption and emission of radiation by interstellar dust
• Modelling absorption and emission of radiation by interstellar dust Bojan
• Abstract

Next: Spectral Line Imaging Considerations Up: Imaging Previous: Imaging . ... Even if you are only interested in continuum imaging, your data may contain several frequencies. Unless you have averaged over frequency channels earlier, your data still contains the 2048 channels produced by the CABB correlator, or 33 frequency channels produced by the old ATCA correlator. ... The technique of forming a single continuum image from a variety of frequencies is called ``multi-frequency synthesis'' (MFS). ...

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• ATNF Daily Astronomy Picture

... It is reasonable to expect that UV part of the irradiating spectrum is most influenced by the grain evolution (growth and sedimentation ) which marks the very initial stage of planet formation. 2 log J [erg s­1 cm­2] 1 0 -1 -2 -3 1000 BB 40 0 0 (A5 ) BB 20 0 00 (A5) Drai ne (A5 ) BP Ta u (A5) BB 40 0 0 (GS) BB 20 0 00 (GS) Drai ne (GS) BP Ta u (GS) Disk Model Density distribution is based on a 1+1D disk ... Green lines are used for a model with dust growth and sedimentation. ...

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... Sources of the quantum theory. ... Wave function and their physical interpretation. Schroedinger equation as a constraint on the physical state. Feynman's formulation of the quantum mechanics (path integration) and classical limit. Quantum mechanics postulates. States and observables, measurable physical values. ... State vector. ... Amplitude and crossection of scattering. ... M.: Nauka, 1974. ... Iroshnikov G.S. Path integral and coherent states in quantum mechanics and field theory. ...

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• Introduction to the geometry of differential equations. Part 1 (Fall 2010)
• Introduction to the geometry of differential equations. Part 3 (Spring 2012)
• Introduction to the geometry of differential equations. Part 3 (Fall 2011)

... NGC 5252 is an S0 galaxy at a redshift of z 0.0230. ... NGC 5252 harbors a Seyfert 2 nucleus which illuminates a defined biconical structure of ionized gas extending up to 17 kpc ( = 100 ) from the center of the galaxy (Tadhunter & Tsvetanov 1989, Prieto & Freudling 1995). ... The SUMA code (Viegas & Contini 1994, and references therein) calculates the emission spectra (lines and continuum) from a shocked cloud which may also be affected by photoionizing radiation, in a plane-parallel geometry. ...

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• Supersonic Motions in the Upper Atmosphere of Jupiter Detected at Ly- with GHRS
• Institute for Planets and Life
• IDEA: Methodological Principles

... The most precisely determined characteristic for accreting neutron stars (NS's) is their period. ... Period changes show fluctuations. ... Some applications of stochastic processes in astrophysics especially in accreting systems were discussed in Lipunov (1987),Hoshino Takeshima (1993) and Lipunov (1992).In Hoshino Takeshima (1993) the authors, using simple models of MHD turbulence, try to explain aperiodic changes in X-ray luminosity of X-ray pulsars. ... Here, -constant angular momentum. ...

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... i.e., the interaction of light (generally from the sun or moon) with stuff in the air: molecules, water: ice and drops; crud; smoke.. ... Ice crystals: halos, sun pillars: the whiteness and brightness of snow . ... What to look for: common halos; coloured and white structures; symmetry and asymmetry . ... How crystals float in the air; the specific orientations mean that some halos change shape and position as the sun changes altitude . ... What do halos look like and how do we recognise them? ...

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• introduction
• Introduction
• About PEARL

For a period of about six days centered on July 19, 1994, fragments of Comet Shoemaker-Levy 9 collided with Jupiter, the solar system's largest planet. ... Scientists and amateur astronomers through the world spent anxious days watching the comet fragments smash into the atmosphere. ... This section offers some background material on Jupiter , comets , and what scientists learned when Shoemaker-Levy 9 collided with Jupiter. Table of Contents Section 1 ...

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• Martian Clouds
• Arcetri Solar Physics Group: Solar Polarimetry
• Asteroid Introduction

Next: NOVIDAS and UVPROC II-Data Archive and Reduction System for Nobeyama Millimeter Array . ... The RATAN-600 radio telescope allows us to carry out simultaneous multi-frequency observations using wide-band radiometers. ... Using these features a flexible astronomical data processing system (FADPS), operating on different UNIX platforms, was created. ... FADPS commands may be executed directly in UNIX, in scripts, or using a special shell for our data processing system in the X-Window system. ...

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• ADASS 2003 Conference Proceedings
• Modelling Spectro-photometric Characteristics of Nonradially Pulsating Stars
• Some Astrophysical and Instrumental Applications of AIPS++

Next: Multiresolution Analysis Up: The discrete wavelet Previous: The discrete wavelet . ... The discrete wavelet transform (DWT) can be derived from this theorem if we process a signal which has a cut-off frequency. ... Usually the wavelet function has no cut-off frequency and it is necessary to suppress the values outside the frequency band in order to avoid aliasing effects. We can work in Fourier space, computing the transform scale by scale. ...

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... Discrepancies provide hints to physics missing from model Armagh Observatory 2008 18/02/08 18/02/08 Armagh Observatory 2008 Ba sic proce ss of ( forwa rd) spe ctrum mode lling Two essential components are required: ­ ­ fluid structure of outer layers of star from which radiation can escape (a model atmosphere - T(z), p(z), etc) associated radiation field, usually described by specific intensity Iv(z,) of ... We notice again that stellar atmospheres are often steady. ...

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• http://star.arm.ac.uk/~ambn/mzbpap.ps
• Armagh Observatory
• Spectrum - control

Next: Optical spectrum of IRAS04296 Up: The peculiar post-AGB supergiant Previous: The peculiar post-AGB supergiant . This paper is a continuation of our series of papers on the investigation of stars which are believed to be in the post-Asymptotic Giant Branch (post-AGB) stage of evolution (Klochkova 1995; Zacs et al. ... Next: Optical spectrum of IRAS04296 Up: The peculiar post-AGB supergiant Previous: The peculiar post-AGB supergiant Klochkova V.G. 12/20/1999 ...

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• Spectral energy distribution
• Experimetn COLD: Introduction
• Cosmological Gene project: Introduction

Next: Historical Notes Up: The Chirplet Transform: Previous: The Chirplet Transform: . ... One of these TF methods, the short-time Fourier transform (STFT), has been used extensively for analyzing speech, music, and other non-stationary signals. ... Another time-frequency representation (which might more appropriately be called a time-scale representation) is the well-known wavelet transformheil-walnut,mallat:theory,daubechies:transform,strangwavelets. ... Historical Notes . ...

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• Historical Notes
• Program of course
• Introduction

Next: The Arecibo Observatory and Up: Astronomer's Guide to the Previous: Astronomer's Guide to the . The 305-m William E. Gordon radio telescope at Arecibo is the largest single-dish radio telescope on our planet, and is available to the global scientific community for astronomical observations at wavelengths between 6 m and 3 cm (frequencies of 47 MHz to 10 GHz). ... In Section 2 of this document, we provide an introduction to the Observatory, the telescope and its instrumentation. ...

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• INTRODUCTION to Spectral Line Observing at AO
• VLBI at Arecibo Observatory
• Spectral-Line Observing at AO

Next: Model of clusters Up: paper2 Previous: paper2 . ... It allows estimating different microphysical properties of scatterers (size, complex refractive index, shape, etc.) from measured characteristics of the scattered radiation. ... The complexity of the direct problem depends on its input parameters characterizing the shape, size and structure of the scattering particle. ... Next: Model of clusters Up: paper2 Previous: paper2 root 2003-04-11 ...

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• intro3e
• Scientific rationale | Radiation mechanisms of astrophysical objects: classics
• Database of Optical Properties -- Level: subsubpage

... Доклады предсталенные во время летней школы 'Atmosphere researches. Challenge for Ukraine", прошедшей с 15 по 19 сентября 2008 г. за поддержки Швейцарского национального научного фонда (JRP #?В7320-110831) . ... Introduction into Particulate matter research: Measurement techniques, formation, influence on air quality and climate. ... Ozone formation in the troposphere: Basic mechanisms and photooxidant air pollution. ... Atmosphere researches. Challenge for Ukraine' . ... 380(44)5264539 . ...

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• Новини Лаборатор?? атмосферно? оптики
• Area of scientific investigations
• Summer School ?Atmosphere researches. Challenge for Ukraine?