We cannot observe the way the distant universe accelerates cosmic rays or produces energetic photons, but acceleration processes also occur on our Sun , though on a much more moderate scale. ... That is why such events are often missed by cosmic ray detectors near the equator, where the lowest energies are excluded by the Earth's magnetic field. The best detectors for observing solar particles are therefore those sensitive to the lowest energies of the cosmic radiation. ...

... Energy . ... The free ions and electrons in a plasma behave the same way. Knowing the temperature of the high atmosphere of Earth, or that of the Sun, we can calculate energies expected of ions and electrons found there. However, ions and electrons actually observed in space are often much, much more energetic, and may move at a respectable fraction of the velocity of light (300,000 km/sec or 186,000 miles/sec). ... Typical energy of an electron in the polar aurora. 40,000 ev . ... 50,000 ev . ...

Wave-Particle Duality of Light. click here to see a wave experiment . ... In the wave theory, greater light intensity simply means more photons. Each photon ejects electrons in the same way, so more intensity means more electrons. Threshold frequency and electron K.E. should not be affected by intensity. ... Light frequencies below the threshold eject no electrons, no matter how intense the light. Light frequencies above the threshold eject electrons, no matter how low the intensity. ...

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. ...

... The first task assumes the searching for chemical composition and sizes of particles which give the wavelength dependence of the extinction efficiencies close to the observed dependence of . Figure 7: Wavelength dependence of the extinction efficiency factors for homogeneous spherical particles of different sizes consisting of astronomical silicate and amorphous carbon. The dashed segment shows the approximate wavelength dependence of the mean galactic extinction curve at optical wavelengths. ...

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" . ...

... The Effect of Ice Particles on the Mesospheric Potassium Layer at High Latitudes . ... Various observational efforts have shown that ice particles manifest in the form of Polar Mesospheric Summer Echoes (PMSE) and Noctilucent Clouds (NLCs). ... The loss rate of K atoms during the summer season (June and July) due to uptake on ice is determined by using the early May K density as the background profile in the absence of ice particles. ...

... 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 . ...

... Particle Sizes in Saturns Rings . ... Credit Copyright: RSS , JPL , ESA , NASA Explanation: What size particles compose Saturn's rings? To help find out, the robot Cassini spacecraft now orbiting Saturn broadcast radio waves of three different wavelengths right through the rings to Earth earlier this month. The experiment was sensitive to ring particle sizes because ring particles much larger than a broadcast radio wavelength will reflect those radio waves away. ... NASA Official: Jay Norris. ...

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) . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2014 February 4 . A Particle Beam Jet forms HH 24 . Image Credit: Hubble Legacy Archive , NASA , ESA - Processing: Judy Schmidt . Explanation: If you visit HH 24, don't go near the particle beam jet. ... Frequently when a star forms, a disk of dust and gas circles the YSO causing a powerful central jets to appear. ... About APOD | ...

... CPS32 charged particle spectrometer chips were total dose tested to 10 krad. The major degradation of these devices, a linear increase in dark current, does not interfere with particle spectrometry operation. ... These results also indicate that imaging APS chips will suffer significant degradation, particularly due to dark current fixed pattern noise, but should remain useful for bright scenes to doses above 10 krad, especially with moderate cooling. ...

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 . ...

How the rings were formed. ... Because of the velocity of mutual collisions increases at the approaching to the planet, there is a region near an every planet where the particles reaching the definite sizes begin to pull due to the mutual collisions. ... Any big particle passes the whole cycle from the destruction to the restoration. ... Why the rings are so flat? ... The gravitation compresses the system from all sides and the rotation axis, but it cannot prevent compression along the axis. ...

... As the outcome of the meeting we expect some identification of joint research projects which would benefit Glasgow-Pulkovo collaboration and FP-7 "RadioSun" staff exchange scheme. Where : The workshop will be hosted at Pulkovo Observatory, Saint Petersburg. When : August 11-15, 2014 . ... This is the format of the workshop we had for Glasgow-Meudon collaboration ) We anticipate that each speaker will have 45 mins, which includes 30 mins to present material and 15 minutes for questions. ...

... Mission discovers particle accelerator in heart of Van Allen radiation belts . ... Using data from a NASA satellite, scientists have discovered a massive particle accelerator in the heart of one of the harshest regions of near-Earth space, a region of super-energetic charged particles surrounding the globe and known as the Van Allen radiation belts. New results from NASA s Van Allen probes show the acceleration energy is in the belts themselves. ... Discover | ...

Dwarf novae are a subclass of cataclysmic variable stars in which a late-type secondary fills its Roche lobe and transfers mass to a white dwarf primary via an accretion disc. ... Those spiral structures are very similar to the spiral shocks discovered by Sawada, Matsuda & Hachisu (1986) in 2D finite difference numerical simulations in accretion discs. In this poster, we want to compare 2D numerical simulations of accretion disc with the observations of SH2 . ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... Publications of the ASP (PASP) . ... Ghostly Particles All About . ... Rather than give up on this problem, Pauli?s imagination leaped in that darkness, and our understanding of Nature was propelled forward. ... Radioactivity refers to the process by which really big nuclei, which are made of large numbers of protons and neutral neutrons?like, say, nuclei of uranium or radium?rid themselves of excess energy. ...

... Informazioni . Informazioni generali . ... Personale . Personale di Ricerca . Personale tecnico, amministrativo, bibliotecario . ... Personale in ordine alfabetico . ... Informazioni varie . Informazioni specifiche . ... Informazioni sindacali . ... Phenomenology of particle acceleration in supernova remnants in the proximity of molecular clouds - DD71/2015 . ...

home . projects . my portfolio . blog . contact . My Ph.D. work was focused mainly on the development of boundary conditions for Smoothed Particle Hydrodynamics simulations of binary stars. ... I developed and tested an innovative way of modeling only the outer parts of stars, therefore allowing for an increased particle and mass resolution in the mass transfer itself. This work was published in Lajoie Sills 2010a (The Astrophysical Journal 726, 66). ...