... Empirical and theoretical modeling of 3-D structures in the solar corona is confronted by the tremendous amount of data needed to represent phenomena with a large dynamic range both in size and magnitude, and with a rapid temporal evolution. Octree representation of the 3-D coronal electron distribution offers the right compromise between resolution and size, allowing computation of synthetic images of the solar corona. ... The time interval between images is one day. ...

. Introduction Archie Howie (Cambridge) . Electron Centenary Lecture Michael Green (DAMTP, Cambridge) . Last updated 17 May 1997, Richard Batley

... Archives . ... Going back to vlk?s comment, it is ?statistically probable? (and so natural) to see 1 keV photons in T= 10^7 K Thermal Bremsstrahlung (TB) spectra, actually more often than you might expect. ... Please, meet Ms. electron. ... Here you call it electron?s rest energy. Yeah, as if electrons rest in one place ever.б  Who remembers the electron mass is 9.1e-31 kg? Well, some freaks do.б  But almost all keV junkies know the electron mass is 511 keV. ... Chandra Blog . ...

... The ionospheric plasma is composed of electrons and ions, freed from each other by ultraviolet energy from the sun. ... The spectrum below shows the widths associated with the hydrogen ions and the oxygen ions, assuming that they have the same temperatures. ... In the black and gray spectrum below, the oxygen ion and electron temperatures are the same. ... temperatures: electron, oxygen ion, and hydrogen ion . ion content: oxygen, helium, and hydrogen . velocities: oxygen ion and hydrogen ion. ...

ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Information & tools for observers . ... Australia Telescope Online Archive (ATOA) . ... ATCA | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The Australia Telescope National Facility Colloquium . ...

... CV & PUBLICATIONS | ... Nicholls, DC, Dopita, MA, Sutherland, RS, Jerjen, H, & Kewley, LJ " Metal-poor Dwarf Galaxies in the SIGRID Galaxy Sample. ... Nicholls DC, Jerjen, H, Dopita MA, & Basurah, H. (2014) " Nebular Metallicities in Two Isolated Local Void Dwarf Galaxies ", Astrophysical Journal 780, 88 * . ... Sweet SM, Drinkwater MJ, Meurer G, Bekki K, Dopita MA, Kilborn V, & Nicholls DC, " CHOIRS H I Galaxy Groups: The Metallicity of Dwarf Galaxies" , (2014) Astrophysical Journal , 782, 35 * . ...

. Apogee moved from tail (~00:00 hrs LT) into solar wind (12:00 LT) and back . 2 major solar particle events (July 2000, November 2000) . many geomagnetic storms . Previous slide . Next slide . Back to first slide . View graphic version .

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... This fluffy pink blob is the star-forming region LHA-120-N 11 in the Large Magellanic Cloud some 170 000 light years from the Sun. N 11 (occasionally called the Bean Nebula) is about 1000 light years across. ... Hydrogen is the main element making up such clouds. ... There is a certain amount of energy associated with the electron?s orbit and there are a series of possible orbits the electron can be in around the nucleus. ...

It is difficult to do experiments with K?12 students which demonstrate that light involves electric and magnetic fields. ... For advanced students, these experiments can show how light reveals the structure of atoms. ... Visible light penetrates glass. ... Static, unchanging magnetic fields don't spawn electric fields, and steady electric fields don't create magnetic fields. ... Light and other forms of electromagnetic radiation contain both electric and magnetic fields that oscillate in strength. ...

... Fermi catches thunderstorms hurling antimatter into space . Scientists think the antimatter particles formed in a terrestrial gamma-ray flash, a brief burst produced inside thunderstorms and associated with lightning. ... Scientists using NASA's Fermi Gamma-ray Space Telescope have detected beams of antimatter produced above thunderstorms on Earth, a phenomenon never seen before. ... The distant storm was below Fermi's horizon, so any gamma rays it produced could not have been detected. ...