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. ...

In order to assist folks upgrading we are now going to maintain a document describing information critical to existing Apache users. Note that it only lists differences between recent major releases, so for example, folks using Apache 1.1 or earlier will have to figure out what changed up to Apache 1.2 before this document can be considered relevant. Old users could look at the src/CHANGES file which tracks code changes. ... There have been numerous changes to the default config files. ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... 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 . ... Hayabusa update . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Updated 2006 December 25th . ... Updated 2006 October 3rd . ... Updated 2006 September 3rd . ... Updated 2006 August 18th . ... Updated 2006 August 16th . ... Updated 2006 August 10th . ... Updated 2006 August 4th . ... Updated 2006 August 1st . ... Updated 2006 July 31st . ... Updated 2006 July 24th . ... Updated 2006 July 21st . ... Updated 2006 July 19th . ... Updated 2006 July 3rd . ... Updated 2006 February 3rd . ... Dry January . ... Web Site Statistics for 2005 . ... Updated 2006 January 3rd ...

MINUTES of the RadioAstron Teleconference on December 13, 2011 Yu.Yu. ... IOC status update M. Popov informed the participants on the current IOC results. ... Kovalev added: we continue to observe pulsars and spectral line sources in radiointerferometer mode but only with spacecraft and we are also going to observing pulsars soon with space-ground baselines. ... Kovalev: It is fringe-fitting result. ... In RAFS05 we replace it with K-band observing (maser source Ori KL ­ spectral lines ~100000Jy). ...

Astronomical Data Analysis Software and Systems XIII ASP Conference Series, Vol. ... During early flight operation, the Chandra X-ray Observatory's Advanced CCD Imaging Spectrometer (ACIS) suffered degradation of charge transfer inefficiency (CTI) due to radiation induced charge trapping. The ACIS front-illuminated detector CTI has significantly degraded over time with respect to the intrinsic energy resolution of the chips. ... We will discuss the impact of CTI on events, RMF and gain files. ...

. You can check for and then change your current directory on the local host using the lcd command. For example: ftp> lcd Local directory now /u/user/eucs/eucs99 ftp> lcd REPORTS Local directory now /u/user/eucs/eucs99/REPORTS . Here, you have changed to your current directory and then moved to the subdirectory REPORTS .

... It was designed to observe the solar wind approaching Earth, from a position near the Lagrangian point L1, and it is part of the International Solar-Terrestrial Physics (ISTP) Initiative . ... The original plan called for "Wind" to approach its final station over two years, undergoing two close encounters with the Moon to boost its speed. ... If however the object is moving , the encounter is not symmetric, and in the end the spacecraft may have gained or lost speed, depending on its trajectory. ...

Marc White . ... This page details the updates and changes I've made to this website since it's original iteration. ... The changes listed here are structural/design changes only. ... 29 Dec 2013 . ... Altered header/footer background colour, added header background image . ... E marc.white@anu.edu.au . ... F www.facebook.com/marc.white.au . L au.linkedin.com/pub/marc-white/84/460/84a/ . S marc.christopher.white . G github.com/marc-white . Design copyright Marc White 2014 . ...

NOTE: The storm sudden commencement data file was updated on 18 Feb 1998. o Revised data for 1968-1975 were taken from IAGA Bulletin No. ... Indices aa and storm sudden commencements"; see also IAGA Bulletin 39: " Supplementary Geomagnetic Data 1957-1975", including a new list of ssc's 1968-1975). ... From the monthly reports of Rapid Variations prepared by 43 magnetic observatories (see list page 121), a combined list of all events is compiled. ...

... In less then one day "Mir" station will finish its flight. ... Besides, the operability of motion control systems will be tested to ensure further dynamic operation at the final stage of "Mir" complex. ... The final third burn is given in daily orbit 2 using the "ProgressM1-5" 8 control engines and its main engine with the trust of 300 rg/s. Thus, to peform deorbit maneuver the OC"MIr" real-time tested manuevers involving control engines and their combination with the main engine are used. ...

. Please update your bookmark. The correct loading will start after 3 seconds. Send mail to zasov@sai.msu.su

. RC-archive . RC0209+0501b . RC0213+0516 . RC0226+0512 . RC0250+0512 . Radio source parameters . The R-band contours (BTA) superposed . on 4860MHz image (VLA) ps . R.A.(B1950) Dec.(B1950) Freq. Comp. Comp. [MHz] size["] flux[mJy] 02:48:15.71 +05:03:52.4 8439.9 .3 6.6 02:48:15.77 +05:03:52.5 .3 6.6 02:48:15.72 +05:03:52.5 1425.0 1.5x . Parameters of optical candidates for identification . The map (4860MHz,VLA) superposed . on the R-band image (BTA) ps . Last updated 24 Jul 2001

... The change in the temperature dependence of the resistance, R ( T ), of ceramic YBa 2 Cu 3 O 7 - x as oxygen is removed from the sample has been studied. The superconducting transition temperature shifts progressively downward in the process. ... The temperature dependence of the resistivity, ( T ), is linear, with a progressively increasing slope, only at T > 400 K. It is suggested that oxygen condenses on Cu-O chains at T 400 K. PACS: 74.60.Mj, 74.70.Vy, 81.40.Rs, 72.80.Ga ...

Previous Editions of the M111: . ... OutReach Training and Program . September Public Night . Welcome all ye weary travelers to a new type of M111 "On Line". ... Back to top.. ... When I logged our last outreach programs I couldn't help but notice that Warren Rupp Observatory is NUMBER FIVE in the worldwide standings in public outreach programs! ... If you'd like to train in astronomy outreach, just contact any of our members and we'll be happy to train you to do public outreach! ...

... About ATMoB . ... The ATMoB has established an email list server with various mailing lists for use by our members. ... This list has been established for use by ATMoB members, friends of members, and anyone interested in astronomy with a focus on things of interest to those in the greater Boston area. ... Notice: The owners of this server, the Amateur Telescope Makers of Boston, and any other sentient beings that happen to be involved assume no responsibility for any messages posted via this system...

... start : q3c . ... SAI VO Projects . ... Help on Wiki search . ... Ask your administrator if you think this is wrong. code dropdb q3ctest createdb q3ctest psql q3ctest /usr/local/pgsql/share/contrib/ q3c .sql psql q3ctest /usr/local/pgsql/share/contrib/pg_sphere.sql /code code -- Static data SELECT generate_series(1, 1000000 ) AS id, random ()*360 AS ra, ( random ()-0.5)*180 AS dec INTO test_ q3c ; SELECT generate_series(1, 1000000 ) AS id, spoint( ... SAI VO | ... SAI MSU | ...

... Basic Observables: Zero-differenced phase and code ionosphere-free combinations of global GNSS network stations, corrected by P1-C1 satellite code biases (cc2noncc), daily observations with 30 seconds sampling rate Sites coordinates : IGb08 reference frame coordinates and velocities Displacements: solid tides, ocean loading, pole tide loading (IERS 2010) Geometric model : Receivers antennas eccentricities, absolute receiver and ...

The revision of the MASS/DIMM star catalogue N. Shatsky, V. Kornilov March 16, 2008 Abstract The compilation of the (updated) version of the MASS (MASS/DIMM) device target catalogue is described. ... Then the list was cleaned according to following criteria: I. Remove stars too faint for a MASS device. ... Here the color equation of the Sternb erg device was taken: M AS S mag = V mag + 0.45 (B - V ); stars with M AS S mag > 3.2 were removed. ... This was made based on the GCVS4.2 catalogue data. ...

ARI USEFUL LINKS modified and/or upgraded by YP (Jul 1, 2015) . Astronomy . ... Astronomy related journals . ... Go to TOP . ADS ( UK , US or French site) . Abstracts from the major Astronomy journals. ... Astronomy Picture of the Day . ... Astronomy and Astrophysics (Bertout's site). status of a paper . ... of Stellar Spectra by R.O.Gray and VISUAL atlas (as pdf) . ... A list of Astronomy databases from the well organised canadian site. ... Astronomy jobs.../courses Go to TOP . ...