... Note: Click here a longer, much more comprehensive overview of the polar aurora . ... Magnetic Field . ... Aurora . ... 3b. Fritz Aurora . ... Electrons . ... Typical aurora (Dick Hutchinson ї) . In Alaska, Canada, Norway, Finland or northern Russia, on a clear night, a greenish glow is often seen in the sky, known as the "Northern Lights." ... Auroral light is produced at a height of about 100 km (60 miles) when fast electrons, arriving from space, slam into atoms and molecules of the atmosphere. ...

... a greenish glow is often seen in the sky, known as the "Northern Lights." ... During magnetic storms, the glow may move southwards, and on occasion it can be seen in much of the US. ... A similar phenomenon is also seen in southern polar regions. ... Auroral light is produced at a height of about 100 km (60 miles) when fast electrons, arriving from space, slam into atoms and molecules of the atmosphere. ... The green light of the aurora puzzled scientists for many years, since it fit no known...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets? ... RELATED TOPICS: MAGNETIC FIELD . Planetary magnetic fields are definitely related to rotation, but directly not so much. ... Get instant access to subscriber content on Astronomy.com! ...

... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 > Modules . ... To enable mod_dav , add the following to a container in your httpd.conf file: . ... In addition, a location for the DAV lock database must be specified in the global section of your httpd.conf file using the DavLockDB directive: . ... In order for mod_dav to manage files, it must be able to write to the directories and files under its control using the User and Group under which Apache is running. ...

Modules | ... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Modules . ... Basic HTTP authentication . ... This module allows the use of HTTP Basic Authentication to restrict access by looking up users in the given providers. ... This module should usually be combined with at least one authentication module such as mod_authn_file and one authorization module such as mod_authz_user . ... Module: . ... Location /demo> AuthBasicFake demo demopass </Location> . ...

... PmWiki / . authors (basic) A key feature of WikiWikiWebs is the ease of creating links in the text of a document. ... To create a link to another page, simply enclose the name of the page inside double square brackets, as in [[wiki sandbox]] or [[installation]] . ... PmWiki creates a link by using the text inside the double brackets. ... PageName|+]] creates a link to PageName and uses that page's title as the link text, eg [[Links|+]] gives Links . ... name|link text]] within the same page, or . ...

The sections <Directory> , <Location> and <Files> can contain directives which only apply to specified directories, URLs or files respectively. Also htaccess files can be used inside a directory to apply directives to that directory. ... The order of merging is: . ... If multiple <Directory> sections apply to the same directory they are processed in the configuration file order. ... Using the options in question is only possible inside a <Directory> section (or a .htaccess file). ...

... One of this year's largest mass ejections from the Sun's atmosphere was recorded last Sunday by TESIS telescopes aboard the CORONAS-PHOTON satellite ( video - wmv 4.3 MB ). ... Over the course of a week, two gigantic solar prominences were simultaneously ejected from the surface of the Sun. ... Earth will not feel the Sun's influence either. ... The TESIS observatory ї TESIS: www.tesis.lebedev.ru . ... One of this year's largest mass ejections from the Sun's atmosphere (movie WMV, 4.3 MB) . ...

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

Instrument . ... Scanning TV-sensor with on-board data recording system for global coverage mode . ... recording, direct transmission . ... IR-radiometer for global coverage and direct data transmission modes . ... The scientific instrument package onboard the Meteor-3 spacecraft provides for regular instant acquisition of images of cloudiness and Earth surface in visible and infra-red bands, data on air temperature and humidity, sea surface temperature and clouds temperature. ...

Next: Analysis Tools for Nebular Emission Lines . ... Extracting spectra from a large number of NICMOS grism images requires a convenient interactive tool which allows a user to manipulate direct/grism image pairs. ... The direct image is used to locate objects of interest, to find the position of the appropriate spectra in the grism image, to determine the optimal extraction technique to use, and to calibrate the wavelength range of the extracted spectra. ... Figure 1: The NICMOSlook User Interface . ...

A very unusual weather pattern occurred in the Pacific Northwest Sept 26,27 and 28 but almost no one noticed (including most of the TV weather guys). ... As a result, although it was clear and sunny, day times highes in the region were around 65 and it was close to freezing in many locations (Frost in September in the Willamette Valley is unusual). This culminated with Eugene setting the all time record low for the month of September on Sept 28. ...

Next: Imaging Polarimetry with NICMOS Up: NICMOS Data Calibration and Previous: The Photometric Performance of . ... NICMOSlook and Calnic C . ... Extracting spectra from a large number of NICMOS grism images requires a convenient interactive tool which allows a user to manipulate direct/grism image pairs. ... NICMOSlook and Calnic-C are two programs that were designed to take advantage of the fact that the NICMOS grism mode typically consists of taking both a direct and a grism image. ...

... RECOMMENDED VALUES OF PHYSICAL CONSTANTS AND CONVERSION FACTORS. ... This reference must be included when these constants are used in a context where their full accuracy is important. ... elementary charge (of proton) . ... gravitational constant . ... unified atomic mass constant . ... of electron . ... of proton . ... Planck constant . ... Rydberg constant, m 0 2 m e e 4 c 3 /8h 3 . ... fine structure constant, m 0 e 2 c/2h . ... Bohr radius, h 2 ( pm 0 c 2 m e e 2 ) . ... Bohr magneton, e h /2m e...

... Apply for membership online: It s OK to provide a paper application a visitor can complete at the club meeting, but for added convenience and to attract younger members, many clubs now use the customizable Night Sky Network online application form. ... Sharing the Universe videos are produced by the Astronomical Society of the Pacific (ASP) from research conducted by the Institute for Learning Innovation, the ASP, and from astronomy clubs like yours. www.astrosociety.org/SharingTheUniverse . ...

... Earth's North Magnetic Pole . ... A magnetic compass does not point toward the true North Pole of the Earth. Rather, it more closely points toward the North Magnetic Pole of the Earth. The North Magnetic Pole is currently located in northern Canada. ... Globular star cluster Palomar 13 has roamed the halo of our Milky Way Galaxy for the last 12 billion years. ... Here is what a meteor shower looks like from orbit. ... Last year, the 1999 Leonids Meteor Shower came to a tremendous crescendo. ...

... 1.Magnetic and magneto-elastic properties of heavy rare earth metals. ... High magnetic fields of 100 kOe and more were necessary to saturate the magnetization of havy rare earth metals. ... It was shown that the effective exchange field theory is sufficient for the description of the magnetic order in heavy rare earth metals and their compounds. ... The duality of the state of the magnetic carriers in the traditional 3d-magnetic materials. ... LHPP ISSP RAS © 2004 All rights reserved ...

... Factors which produce displacement of the photoelectrons between photocathode and diode are the commanded magnetic deflection (Y-bases) and GIM motion. ... The amount of scatter in the mean Y-base location increased after on-board GIM correction started in April, 1993 as frequent DEPERM commanding (clearing of the ambient magnetic field in the detector) was turned off for all but ACQ/PEAK exposures. ... FOS/BL G190H, . ... For spectra taken later, the GIM correction was applied onboard the...

... In addition, IZMIRAN comprises the St.Petersburg branch and magnetic ionospheric observatory in Kaliningrad. The history of IZMIRAN is largely that of investigating magnetic storms and sub-storms on the Earth surface, in circum-terrestrial and interplanetary space, initially by means of a network of ground stations of the Soviet Union (1930s - 1940s) and the nonmagnetic skunner "Zarja", then through the extensive use of magnetic measurements on artificial Earth satellites and automatic stations. ...

... The (very) slow rotation of magnetic Ap stars. ... Magnetic stars in young clusters and associations. ... Magnetic fields in low-mass stars from high-resolution infrared spectroscopy. ... Magnetic field measurements of late B-type starss. ... Measurement of magnetic field of FK Com. ... Magnetic field of white dwarfs. ... The magnetic star evolution project (teleconference). ... Conference-2014 . Program . ... Laboratory for the Stellar Magnetism Study of SAO of RAS . ...