... It seems likely that field-aligned potential drops (upward directed electric fields) are formed to create this effect (e.g., Weimer and Gurnett, 1993), although different wave-related schemes have also been suggested (e.g., Bryant et al., ... Auroral arcs have been related to large, perpendicular electric field structures, electrostatic shocks , observed mostly at geocentric distances 1.4 - 1.8 Re (9000 - 12000 km altitude; Mozer et al., 1977; Torbert and Mozer, 1978; Mozer et al., ... Res. ...

... R2210 Date Received: 2006­Jan­31 18:22:58 Technical Page Proposal Type: Regular General Category: Planetary Radar Observation Category: Solar System Total Time Requested: 18 Hours Proposal Title: Radar Imaging of Two Potentially Hazardous Asteroids ABSTRACT: We propose to take advantage of particularly strong apparitions of Potentially Hazardous Asteroids 2001 CB21 and 7341 (1991 VK), using radar observations to dramatically improve our knowledge of each object's physical properties. ...

... Figure 8: Can you detect the motion of the near-Earth asteroid 2000PH against the background stars during its close approach to Earth around 27 July 2004? ... Down) observed and imaged the unusual near-Earth asteroid 2000PH during its close approach to the Earth around 27 July 2004. The observations were carried out remotely using the new 2m aperture Faulkes telescope situated on the 10,000-foot summit of Haleakala, on the island of Maui in Hawaii. ...

Next: Some theory Up: userhtml Previous: Calibration . By many measures, the ATCA 3-mm observing band is a completely different domain to the other ATCA bands. ... Not surprisingly many aspects of the data reduction are also different. This chapter reviews the theory behind some of the differences, and then considers a practical approach to calibration. ... Antenna gain considerations and flux calibration . Instrumental phase . Atmospheric phase and phase calibration considerations . ...

WFPC2 . Images: version1 , version2 . Catalogs: Version 1 HDF-S , HDF-N ;Version 2 HDF-S . STIS . ... NICMOS . Images: Camera 3 , V2 of psf-convolved STIS 50CCD on NICMOS . ... Images: WFPC2 FF , STIS FF ; Version2: WFPC2 FF , STIS FF , NICMOS FF . Catalogs: Version2 WFPC2 FF , STIS FF , NICMOS FF . ... Check the instrument specific technical pages for a description of the data products and the implemented data reduction steps: STIS , WFPC2 , NICMOS , Flanking Fields . ...

Circumstances of (99942) Apophis, approaches to the Earth in 2029тИЪ2036 . ... In so doing we consider A2 component of additional acceleration in orbital coordinate system, which is present in many near-Earth asteroids and some small main belt asteroids, as a manifestation of Yarkovsky effect. ... It means that Yarkovsky effect does not serve to increase the collision probability in 2036. ... asteroid Apophis, collision with the Earth, the Yarkovsky effect. ...

Solar Flare Origin - critical analysis" Lev Pusti'lnik We analyze current approach to solar flare origin in 3 aspects: a. Pre-flare equilibrium state of current-magnetic structure above active region and its evolution to flare state, b. Possible reasons of stability loss with transition of system in flare state c. Flare energy release in turbulent current sheet and particle acceleration in this system. ...

... Quasars and Black Holes . ... Astronomers using ESOБЂ™s Very Large Telescope have discovered a gas cloud with several times the mass of the Earth accelerating fast towards the black hole at the centre of the Milky Way. This is the first time ever that the approach of such a doomed cloud to a supermassive black hole has been observed. ... Simulation of gas cloud after close approach to the black hole at the centre of the Milky Way . ... ESOcast 39: A Black HoleБЂ™s Dinner is Fast Approaching . ...

... 24-Sep-14 JOURNиES 2014 Investigation · checking possibility of nutation rates estimation based on RLG observations simulation level · combination of simulated RLG data with real VLBI data · comparison of estimates based on real RLG data (Wettzell) with results of simulation 24-Sep-14 JOURNиES 2014 Simulation ... 10-8) 24-Sep-14 JOURNиES 2014 Simulated data + VLBI (ac. lev. ...

... A radio galaxy is a galaxy that emits an unusually big amount of energy at radio wavelengths. ... Inside of each galaxy with an active nucleus (radio galaxies are among them) there must be a system of a "central machine" responsible for the colossal amount of the emitted energy from radio to gamma ranges. ... Sometimes a radio source in an active galaxy may flare again if the needed conditions appear (a new portion of matter would fall into the furnace of the "central machine"). ...

Astronomy Picture of the Day . ... 11.10.2000 . ... Credit: Cassini Imaging Team , Cassini Project , NASA Explanation: A new spacecraft has entered the outer Solar System: Cassini . Launched in 1997 and bound for Saturn in 2004, Cassini sent back the above image last week while approaching the giant planet Jupiter . ... October 2000 . ... 1997 1998 . ... Publications with keywords: Jupiter - spacecraft - cassini spacecraft . Publications with words: Jupiter - spacecraft - cassini spacecraft . ...

... Galaxy clusters in presence of dark energy: a kinetic approach . ... The external regions of galaxy clusters may be under strong influence of the dark energy, which was discovered by observations of supernovae Ia at redshift z < 1. The presence of the dark energy in the gravitational equilibrium equation, with the Einstein ? ... diagram where equilibrium solutions are not possible. ... Galactic Cluster in the Presence of Dark Energy . ...

... Calibration and analysis of this observation posed very interesting challenges for the authors, in particular dealing with an exciting new instrument whose on-orbit calibration was not yet well defined. ... Five mosaic positions were observed during five consecutive orbits as well as observations for dark and flat calibration. ... Darks and flats had to be created from contemporaneous reference observations and problems within the calibration process had to be resolved. ...

Astronomy Discussion Forums . Forums: . ... Observation Report 03/15/03 From Coyle Field . ... Post Message | ... Observation Report 03/15/03 from Coyle Field . ... It?s been a while since I could write a decent observation report. ... Coyle Field is a great sight. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Next: Calar Alto 2.2m telescope Up: Spectral observations and data Previous: Spectral observations and data . The observations were made with the GoldCam spectrograph used in conjunction with the 3K 1K CCD detector. We used a 2'' 229'' slit with the grating 09 (316 grooves mm -1 ) in its first order, and a GG 375 order separation filter. ... Next: Calar Alto 2.2m telescope Up: Spectral observations and data Previous: Spectral observations and data Andrew Ugryumov . ...

Properties of the Dark Energy P. M. Garnavich University of Notre Dame A non-zero cosmological constant is only one of many possible ex- planations for the observed accelerating expansion of the Universe. Any smooth, dark energy with a signi cant negative pressure can drive the acceleration and this generic solution has been dubbed \quintessence". ... Quintessence can be parameterized by its equation of state, w = p=, which in the most general form can vary over time. ...

... Prof. G.A. Mikhailov, corr.-member of the Russian Academy of Science . ... Prof. B.A. Kargin . ... Marchuk G.I., Mikhailov G.A., Kargin B.A. et al. 1980) The Monte Carlo Methods in Atmospheric Optics. ... Mikhailov G.A. (1992) Optimization of Weighted Monte Carlo Methods. ... Mikhailov G.A. (1998) New approach to constructing and substantiating weight "path estimates" in Monte Carlo method. ... Optics of Atmosphere and Ocean , v.12, p.238-245. ...

Main Sections LabIR main page . ... On January 23, 1998 the space probe NEAR was on its way to its closest approach to Earth. ... However, we were able to record a series of images of the space probe shortly before the sunglint event, and we have assembled them into a movie. At the TIRGO observatory, an observation of the space probe NEAR was organized for the night of January 22-23, 1998. ... We show here a preliminary movie (MPEG format, 412kb) made from 74 frames, each lasting 5 seconds. ...

... Dept. for Astrometry & Space Geodynamics . ... Dept. for Physics of Stars&Galaxies . Dept. for Space Plasma Physics . ... Solar telescopes . ... 2016,MNRAS, 2016MNRAS.tmp.. ... 2016,MNRAS, Vol.455 ,is.1,p.357-369. ... 2016,MNRAS, Vol.456 ,is.1,p.181-191. ... WASP- 22, WASP-41, WASP- 42 and WASP- 55. ... 2016,MNRAS, Vol.456 ,Is.1,p.990-1002. ... Observations . ... In 2002 regulary observations of comets with using of CCD camera S1C started at Andrushivka Astronomical Observatory, near Zhytomyr. ...