. ___________________________________________________________________ The Electronic Universe Project e-mail: nuts@moo.uoregon.edu

A full explanation of the motion of trapped particles would be too abstract and mathematical for this level, but some basic ideas may be described on an intuitive level. The magnetic force on a moving particle is always perpendicular to the motion, as well as to the magnetic field lines. That is why the basic pattern is motion in a circle, around a magnetic field line. ... The best-known periodic motion is the back-and-forth swing of a pendulum, say of a weight suspended by a string (drawing). ...

The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...

EXPERIMENT . ... Charged energetic particles (Ee=40-200 keV; Ei=0.05-150 keV) composition and anisotropy. ... IKI, Moscow, Russia . ... University of Thrace, Xanthi, Greece . ... Energy spectra, angular distributions and time variations of electrons (E=15-400 keV) and ions (E=20-1000 keV). ... IMBP, Moscow, Russia . ... Moscow University, Moscow, Russia . ... IPG, Moscow, Russia . ...

... Credit Copyright: Phil Hart Explanation: At least 34 meteors are included in this composite image as they rain through Australian skies during the annual Geminid Meteor shower . ... Although the particles are traveling parallel to each other, the resulting streaks clearly seem to radiate from a single point on the sky near Gemini's twin stars Castor and Pollux at the lower right. ... Near the radiant point, an extra star in Gemini is actually the flash of a meteor seen almost head-on. ...

Hubble Observations Shed New Light on Jupiter Collision . Was it a comet or an asteroid? ... Their initial findings, combined with results from other space-borne and ground-based telescopes, shed new light on Jupiter's atmospheric winds, its immense magnetic field, the mysterious dark debris from the impacts, and the composition of the doomed comet itself. ... Hubble's ultraviolet observations show the motion of very fine impact debris particles now suspended high in Jupiter's atmosphere. ...

MATHEMATICAL MODELING: . ... This model is developed on the base of the probabilistic description of the collisional aeronomical processes and is realized on a computer as the numerical system (stochastic model). ... Shematovich, V.I., Bisikalo , D.V.             Nonequilibrium processes in the planetary and cometary atmospheres. ... In Russian) . ... Piarnpuu , A. A.; and Shematovich, V. I.       Construction of structural stochastic models of collision processes in rarefied gas media (abstract) . ...

Blackholes2 Forum Message . Forums: . ... Firtual Particles Are Not Only Particle Pairs . ... Posted by Richard Ruquist on October 19, 2004 12:03:20 UTC . ... Vacuum production of virtual particle pairs cannot violate the uncertainty principle. ... This theory is dual to the particle theory of gravitons. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2009 December 18 . Southern Geminids . ... Explanation: At least 34 meteors are included in this composite image as they rain through Australian skies during the annual Geminid Meteor shower . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . NASA Web Privacy Policy and Important Notices . ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... What is the Higgs particle? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... GCR and SCR are primary cosmic rays. 10-15 years after the discovery of cosmic radiation (1919) there emerged two main avenues of investigation in the physics of cosmic rays (CR): 1) nuclear - elucidation of the origin of elementary particles and nuclear interactions; and 2) astrophysical (space physics) - solution of the problem related to the origin and variations (changes in intensity) of CR. ... Besides, the CR flux in interplanetary space is, strictly speaking, not isotropic. ...

... Ah ha~ Once I questioned, ?what is systematic error?? (see [Q] systematic error. Thanks to L. Lyons? work discussed in [ArXiv] Particle Physics , I found this paper, titled Systematic Errors describing the concept and statistical inference related to systematic errors in the field of particle physics. ... Tags: coverage , Heinrich , likelihood , Lyons , nuisance parameter , objective priors , p-value , particle physics , statistical error , subjective priors , systematic error . ...

... The analysis shows, that asteroid ­ rubble pile loses its fast fragments in no time but the retaining fragments forms a compact structure immersed in dust ­ gas atmosphere, created by interaction of interplanetary medium with dispersed product of collisional evolution of asteroid. By interaction of an asteroid ­ rubble pile with interplanetary medium structures asteroid can increase its brightness on account of blowed up dust simulating phenomenon of distant comet's brightening. ...

Next: Standard orientation Up: Preprocessing Previous: Bias correction . In a similar manner, long dark exposures of the same exposure time can be averaged to produce the DARK frames. ... Use the command COMPUTE/IMAGE to multiply the images by the exposure time and to add back the value for FLAT_BKG . ... Often, BIAS and DARK contain no large - scale structure. ... The commands AVERAGE/IMAGE and AVERAGE/WEIGHT offer number of options to compare the images and filter particle hits. ...

What will happen when the fragments hit Jupiter? ... All the fragments will enter Jupiter's atmosphere at an angle of 42 degrees from the vertical and impact near a latitude of 44 degrees south, but on the back side of the planet as seen from Earth (about 10 degrees in longitude behind the edge of Jupiter, as seen from Earth). ... Any body moving through an atmosphere is slowed by atmospheric drag, by having to push the molecules of that atmosphere out of the way. ...

Next: Field of View Up: CCD Scientific Performance Previous: Back Illumination . The CCD acts as a storage medium, and with frame times of the order seconds, there is no obvious method of employing prompt co-incidence rejection of charged particle events. ... In conventional CCDs, a m track length results in an equivalent energy deposition of 5 - 6 keV, and significant confusion with X-ray events arises. ... A trade-off between rejection efficiency and spectroscopic efficiency is required. ...

Copies of the transparencies of the Plenary talks from the IoP Particle Physics part of PPEUC can be found below. ... Latest Experimental Results from ZEUS: Roger Cashmore (Oxford). Latest Experimental Results from H1 John Dainton (Liverpool). ... Latest Experimental Results from LEP and SLC David Ward (Cambridge) . Latest Experimental Results from Fermilab Mike Albrow (Fermilab) . ... CP Violation in Particle Physics John Fry (Liverpool) . ...

... These trajectories have an initial flight from the Earth to a large distance (of about 1.5 million km), the following passive flight to the Moon's orbit, an approach to the Moon with a decrease of an energy of a particle (spacecraft) selenocentric motion to a negative value and the temporary capture in an elliptic orbit of the Moon's satellite. ... Several trajectories of this type are determined. ... Ivashkin V. V. On optimal trajectories of space flight to the Moon in the Earth--Moon--Sun system. ...

Lectures . ... Home Lectures Lecture Series 2010-2011 Lecture Series 2010-2011 ? Particle Physics at the LHC and Cosmology? by Michael Tuts . ... Lecture Series 2010-2011 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... IS gas + dust = cosmic abundance [X/H]g + [X/H]d = [X/H]cosmic 5 elements: C, O, Mg, Si, Fe Gas: absorption lines Dust : IS extinction curves Abundances : Reference, cosmic, interstellar , solar COSMIC Sun 06.08.2008 , 12-30 ISM-SAO 5 Interstellar dust grains consist of five the most «important» elements: C, O ­ primary Units: Mg, Si, Fe ­ major ... ApJ 641, 327, 2006 (STIS) + Fitting () 06.08.2008, 12-30 ISM-SAO 62 c2 c3 c4 06.08.2008, 12-30 ISM-SAO 63 06.08.2008, 12-30 ISM-SAO 64 ...