The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... That produces an extra resistance to the flow of current. ...

... This gives us another handle on how distant the stars are. ... Stars differ not only in distance, but also in apparent brightness. ... Ranking stars by brightness . ... The brightness of the star decreases as the square of the distance. ... At what distance would a 100-watt light bulb have the same brightness as the brighter stars? ... So if the distance of the 100-watt light bulb was 5 kilometers, the distance of the brighter stars would be 10,000,000,000,000 kilometers, or about a light-year. ...

... Luminosity (L) · · · · A source's luminosity is the power that it emits in radiation. ... NB Astronomers often say `flux' when they mean `flux density' · SI units are Wm-2Hz -1 -26 filter · Also used are Jy 10 Wm-2Hz -1 E= РРРF d dA dt Specific Intensity, Surface Brightness (I) · Specific intensity (or surface brightness) is the power received (or emitted) per unit area per unit frequency per unit solid angle. ч F at surface of a spherical source = I · · Specific intensity is independent of distance...

... Computing the area lost to bright pixels declared on-board is another matter. It depends on energy, through the bright pixel level. If the telescope's attitude were to vary significantly (more than the PSF) with time, then it should be considered using X,Y (attitude corrected) as coordinates for CCDBKG, since the optical background from stars would follow the attitude variations. ... The subroutines CTI_CORR and ENERGY only call the CAL routines CAL_mosCTIcorrection and CAL_gainCorrection. ...

... Outreach . ... I'm a PhD student at the Australian National University's Mt Stromlo observatory and am part of the Australia Telescope National Facility (ATNF) graduate program. I study the properties on nearby galaxies and investigate the evolution of the local universe. ... I run the RSAA Student Outreach Group which invites school children to participate in free astronomy outreach evenings. ... Copyright 2007 Emma Kirby. ... All Photos were taken by Emma Kirby unless otherwise stated. ...

Program Id: . ... UTC End Time: . Astronomer/PI Name(s): . ... Observer Name(s): . Nightlog Day: Sunday Monday Tuesday Wednesday Thursday Friday Saturday Month: January Febuary March April May June July August September October November December Day (DD): Year (YYYY): Full Night A (First half) B (Second half) Special Schedule . ... Note: Open this weather logfile program in another browser window. Please copy and past the resultant info below at the end of the night) . ...

... DIGITAL EDITIONS . ... Tonight's Sky . ... 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 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... December 2002 . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

... December 20-24, 2004, . Space Research Institute (IKI),Moscow, Russia. ... The conference will commemorate his contribution to astronomy by concentrating on recent progress in cosmology and high energy astrophysics, the areas where his ideas laid basis for revolutionary advances. The conference will be held at the Space Research Institute (IKI) in Moscow, Russia, on December 20-24, 2004. ... Cosmology . ... High Energy Astrophysics Department at IKI , 2004. ...

... The school and the conference will be held at the Poncelet Laboratory for all days except from December 7 . ... The nearest metro station is СМОЛЕНСКАЯ (Smolenskaya), line 3 , 5 minutes by walk. ... How to reach Poncelet Laboratory from these metro stations. ... It is located within 15 minutes by feet from АКАДЕМИЧЕСКАЯ (Akademicheskaya) metro station, line 6 . ... There are a lot of exchange offices where you can exchange euro or US dollars to rubles. ...

Spain ----- (Music by Chick chorea, Words by Al Jareau) Adagio ----> Yesterday, just a photograph of yesterday.. And all it's edges folded and the corners faded sleepy brown. ... And now we know, we know this time it's for good. ... Verse I - ------- I can remember the rain in December, the leaves of brown, on the ground.. In Spain I did love and adore you! ... Bridge - ------ I can recall my desire Every reverie is on fire And I get a picture of all my yesterdays, Yesterday I can say. ...

... Recent Topics . ... MAO main . ... December Issue: World Changing Ideas . ... Тема: December Issue: World Changing Ideas . To view this email as a web page, go here. links.email.scientificamerican.com/servl.. ODAyMzY2Njk2S0 =0 . ... World Changing Ideas . ... Since 1845, Scientific American has chronicled ideas and inventions that have changed the world. ... Board Categories MAO main - Info - MAO - news - Flame Technical - Technical Support(Forum)(Техподдержка(Форум)) . ... MAO NASU . ...

... The Pleiades star cluster, also known as the Seven Sisters and Messier 45, is a conspicuous object in the night sky with a prominent place in ancient mythology . ... The stars in the Pleiades are thought to have formed together around 100 million years ago, making them 1/50th the age of our sun, and they lie some 130 parsecs (425 light years ) away. ... Data for these stars are listed in a table below. ... Yes . ... WEBDA Pleiades cluster data . ... M45: The Pleiades Star Cluster (2007 November 18) ...

... Printed in U.S.A. *CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources* Stephen E. Healey , 1 Roger W. Romani , 1 Gregory B. Taylor , 2 Elaine M. Sadler , 3 Roberto Ricci , 4 Tara Murphy , 3, 5 James S. Ulvestad , 6 and Joshua N. Winn 7 /Received 2006 December 19; accepted 2007 February 5/ *ABSTRACT* We have assembled an 8.4 GHz survey of bright, flat-spectrum (? > -0.5) radio sources with nearly uniform extragalactic (|/b/| > 10 0; ) coverage for sources brighter than /S/_4.8 GHz = 65 mJy. ...

. Date, from: . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 January February March April May June July August September October November December 1952 1953 1954 1955 1956 . to: . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 January February March April May June July August September October November December 1952 1953 1954 1955 1956 . Longitude, from: . to: . Latitude, from: . to: . Area, from: . to: . Brightness, from: . to: .

... In typical nightly use, the wide field and planetary telescope and cameras record images of favorably placed objects in the sky, including constellations, bright variable stars, nebulae through narrow-band filters, comets, the Moon, and planets. ... Shared Skies telescopes are available for use by students at the University of Louisville and the University of Southern Queensland, and by teachers and students in middle and high schools mentored by faculty at the universities. ...

... The main field of my investigations is stellar spectrophotometry. As a result of scientific activity of our group spectrophotometric catalog was created including energy distribution data on 900 stars in the range 3200-7600AA and 250 stars in the range 6000-10800AA (Voloshina et al., Spectrophotometry of Bright Stars, ed. I.N.Glushneva, 1982, Moscow, Nauka, in Russian). ...

Russian . ... text in Russian) . ... The Behaviour of the Bz Component of the Magnetic Field in Coronal Mass Ejections . ... Cooperation of IZMIRAN and Sternberg Astronomical Institute in the Study of the Sublimational Component of the Solar Coronal Radiation . ... Solar Wind and Magnetic Storms in the 24th Solar Activity Cycle . ... text in English) . ... The Solar Corona in the Light of TRACE Observations . ... Expeditions of Irkutsk Astronomers to Total Solar Eclipses in 1981--2012 . ...

... Born december 7-8 1971 in Moscow. At first, nearly 8 years of my life I did nearly nothing. Then again for nearly 8 years I studied at the Moscow school N15 ( now N1272 ), so I know English a little bit. ... In 1995 I have graduated from the Moscow State University , but didn't leave it completely. ... My main scientific interests include binary and isolated compact objects. ... At the same time I started to write papers popularizing science for different russian journals and web-projects. ...

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...