... Arcs are the most typical auroral forms in the premidnight sector auroral oval . ... There are two types of electric fields related to auroral arcs (see, e.g., Johnson et al., ... The first one, polarization electric field, forms withing the arc because of the increased ionospheric conductivity (de la Beaujardiere, 1977, 1981). ... Res., ... Lanchester, B. S., K. Kaila, I. W. McCrea, Relationship between large horizontal electric fields and auroral arc elements, J. Geophys. ... Geophys., ...

CIMA is more than just the observing tool - in fact, the observing tool is just a part of a bigger package called the CIMA software package. ... There is also a another package called the CIMA WAPP software which contains the WAPP software, the special Tcl/Tk interpreter used by CIMA and support libraries. ... All CIMA software components recognize the following general options that are part of the CIMA version selection system: . ... The select_cima script can be used to set up a default version. ...

... ACCESSORIES . ... OEM COMPONENTS . ... ABOUT LOMO . ... MICROSCOPES . ... OEM OPTICAL COMPONENTS . ... MICROSCOPE APPLICATION GUIDE AND MODEL SELECTOR . ... LOMO stereo microscopes deliver crisp images for such demanding applications as industrial inspection, electronic component manufacturing, biological and botanical studies, classroom teaching, etc. ... LOMO manufactures the widest range of microscope accessories and components such as objectives, eyepieces, condensers, illuminators, stages, etc....

... 2015 October 14 . A Gegenschein Lunar Eclipse . ... Beyond Earth's cone of darkness are backscattering dust particles orbiting the Sun that standout with a diffuse glow called the gegenschein , visible as a faint band rising from the central horizon and passing behind the Moon. ... Visible in the distant sky as the blue dot near the top of the image is the star Sirius , while the central band of our Milky Way Galaxy arches up on the image left and down again on the right. ... About APOD | ...

Next: Polarization efficiency: size/shape/orientation effects Up: Optical properties of cosmic Previous: The 2175? feature . To model the interstellar polarization one needs to calculate the forward-transmitted radiation for an ensemble of non-spherical aligned dust grains. ... Let non-polarized stellar radiation passes through a dusty cloud with a homogeneous magnetic field. ... The angle between the line of sight and the magnetic field is ( ). ... where the angle is connected with and ( ). ...

... Tonight's Sky . ... The Magazine . ... Star Atlas . ... An artificial comet holds secrets to Earths life . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The planet has extreme temperature swings and perhaps active lava flows. ... A digital supplement to Astronomy magazine. ... Join TravelQuest International with Astronomy and Discover magazines on one of three great tour options surrounding this celestial spectacle . ... Astronomy Magazine . ...

. Authors: V.A. Marsakov , Yu.G. Shevelev , . Journal: Bull. Inform. CDS, 1988, № 35, p.129-130. љљљљљThe values of [Fe/H], the distancec, the componets of the space velocities and orbital parameters are calculated for 1304 non-evolved F -stars with homogeneous data and proper motions.

... Observations . ... Natural Satellites Data Center. ... Nomenclature of satellites | ... Inner satellites of Jupiter . ... Inner satellites . Mutual events of the Galileans . ... Inner satellites of Saturn . Main satellites of Saturn . ... Mutual events of the main satellites . Inner satellites of Uranus . Main satellites of Uranus . ... Mutual events of the Uranian satellites . Inner satellites of Neptune . Main satellites of Neptune . Outer satellites of Neptune . ...

... Not the culmination of ancient prophecy, but none the less mystical, Earth's small Moon will begin a slow slide past the enormous Sun. ... The dark, inner part of the Moon's shadow, the umbra