... 2010 October 10 . Moonquakes Surprisingly Common . Credit: Neil Armstrong , Apollo 11 Crew , GRIN , NASA . Explanation: Why are there so many moonquakes? A recent reanalysis of seismometers left on the moon by the Apollo moon landings has revealed a surprising number of moonquakes occurring within 30 kilometers of the surface. ... The cause of the moonquakes remains unknown, with one hypothesis holding that landslides in craters cause the vibrations. ... About APOD | ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. November 8, 1996 . A Solar Corona Ejection . ... One reason, besides the extreme heat, is that explosions are common there . In the above picture, magnetic fields buckle releasing previously constrained hot material from the upper atmosphere of the Sun . ... CMEs are more common but less intense than solar flares . ... About APOD | ...

... See the Karma User Manual section on commonfeatures . ... See the Karma User Manual section on loadingdata . ... See the Karma User Manual section on colourcontrol . ... See the Karma User Manual section on movies . ... See the Karma User Manual section on hardcopies . ... Zooming љ љ . ... See the Karma User Manual section on zooming . ... See the Karma User Manual section on resizingdisplays . ... See the Karma User Manual section on axislabels . ... See the Karma User Manual section on magnifier ...

... Credit Copyright: Daniele Boffelli Explanation: Auroras usually occur high above the clouds. The auroral glow is created when fast-moving particles ejected from the Sun impact the Earth's magnetosphere , from which charged particles spiral along the Earth's magnetic field to strike atoms and molecules high in the Earth's atmosphere . ... The relative heights of clouds and auroras are shown clearly in the featured picture from Dyrholaey, Iceland. ... Publications with keywords: aurora - clouds . ...

... The Cross-Quarter Days thus mark the middle of each season under our current system, or seasonal boundaries under the alternative system. ... Beltane / Bealtaine - Celtic bonfire festival May 4-7 2nd Cross-Quarter Day May 5 - Cinco de Mayo (Mexico) May 2nd Sunday - Mother's Day May last Monday - Memorial Day ( Decoration Day , officially May 30) June 14 - Flag Day June 3rd Sunday - Father's Day June 20-22 2nd Quarter Day - Summer Solstice June 21 - Litha (Norse/Anglo-Saxon for ...

Weaving together Astronomy+Statistics+Computer Science+Engineering+Intrumentation, far beyond the growing borders . ... Archives . ... Fancy statistical methods will not rescue garbage data. ... This seems hardly true unless the astronomer knows the true underlying population distribution from which those realizations (either binned or unbinned) are randomly drawn. ... A common error is to specify a confidence interval in the form (estimate ? ... Category: Bad AstroStat , Cross-Cultural , Quotes | ...

dfos = Data Flow Operations System, the common tool set for DFO . ... DFOS tool . level1 (main) tool, called from the command line . calling ... level 2 (helper) tool, called from a level1 tool . ... This workflow is not supported anymore by the QC operational model XXLight. ... These steps are called per data package (RUN_ID). process step . ... workflow step . ... calling .. DFOS tools: overview . ... DFS . ... Workflow tools . ... DFS : tool developed and maintained by DFS . ...

Next: Feature enhancement: local Up: No Title Previous: Feature enhancement: filtering . ... As a result, a common magnitude scale (contour lines on the maps above, or color scale on Fig.1) will poorly display the short-duration events in a signal. Normalizing each line of the map (fixed duration) so it has unit variance (in effect dividing the energy map by the mean energy spectrum) at each duration restores more details of small-scale activity (Fig. ...