. Aurora on 6 January 1998 (Dick Hutchinson ї) .

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. ...

... 2003 December 17 . A Proton Aurora . Credit: IMAGE Satellite , NASA . ... Triggered by solar activity, normal auroras are caused by collisions between fast-moving electrons and the oxygen and nitrogen in Earth's upper atmosphere. ... Such a proton aurora is seen above, recorded by the IMAGE satellite . ... Most solar wind protons never reach the Earth to cause auroras because they are completely deflected away at a great distance by the Earth's magnetic field . ... About APOD | ...

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... A Blue Moon Halo over Antarctica . ... HCG 87: A Small Group of Galaxies . ... By planet Earth's calendar, the Curiosity Mars Rover reached its 3rd anniversary on the surface of the Red Planet on August 6. ... Full Earth, Full Moon . ... But on that date a million miles away, the Deep Space Climate Observatory (DSCOVR) spacecraft's Earth Polychromatic Imaging Camera (EPIC) captured this view of an apparently Full Moon crossing in front of a Full Earth. ... Virgo Cluster Galaxies . ... August . ...

A quite amazing and extensive aurora was visible from Northern Ireland during much of last evening and into the early morning. Astronomers at the Armagh Observatory were occupied for much of the evening in recording observations and taking photographs of the spectacular display. The display was first seen when twilight ended as a prominent blue glow in the northeast. About 15 minutes later, at around 7:00 pm, a green aurora could be seen in the northeast. ...

Galileo Finds Giant Iron Core in Jupiter's Moon Io . Jupiter's volcano-pocked moon Io has been found by NASA's Galileo spacecraft to have a giant iron core that takes up half its diameter, scientists report in today's issue of Science magazine. The spacecraft also has detected a large "hole" in Jupiter's magnetic field near Io, leading to speculation about whether Io possesses its own magnetic field. If so, it would be the first planetary moon known to have one. ... Space History Galileo . ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... One of the rarest but most interesting effects which can be observed with the Irkutsk IS radar is anomal high power signal registraion(coherent echo) due to strong magnetic storms. ... These signals are formed at E-layer heights in the presence of a strong electric field which causes particles to drift. ...

... Tonight's Sky . ... Observing . ... Star Atlas . ... stars . ... Astronomy for Kids . ... Picture of the Day . ... Observing springtime deep-sky objects with a large telescope . ... What causes spikes around stars in pictures, and how can I prevent them? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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... A bad cable was found in wapp 4 brd 1 channel B on 07mar07. ... The 7B data did not have any jumps since the data did not go through the bad cable. You can replace the 6B data with the data found in 7B. For single pixel observers, wapp 4 polB will be jump around. ... It got worse during feb07. ... Looking at the a2010 alfalfa total power ratio PolA/polB (check out the feb07 .pdf file in the column Strips: badRatios rms A/B) . ... The ratio started to jump around at the start of feb07. ...

Blackholes2 Forum Message . ... Distant Galaxy Red Shift Caused By Time Passage Variation. ... If I were falling toward a neutron star or a black hole, a distant galaxy would seem to be accelerating toward me? ... And apparent receding distant galaxies with a red shift. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to La Silla . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... ESO Science Newsletter . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... The spectacular displays known as aurorae occur when sub-atomic particles streaming away from the Sun are directed towards the north and south poles by the Earth's magnetic field. ... earth_aurora . ...

Phases of the Moon Phases of the Moon are not caused by the Earth's shadow. They are due to a change in our viewing perspective as the Moon orbits around us as it is lit by the Sun. ... The Earth spins in the light, so that the entire Earth gets to be lit at some point each day. Even though the Moon is always half-lit like the Earth is, sometimes we on the Earth see only a tiny bit lit, other times completely lit, depending on where the Moon is in its orbit around the Earth. ... Look at Day 7. ...

... The eleven years cycle of Sun's activity is approaching its maximum! From August 24th to 29th a team of astronomers, engineers and astro-photographers will travel to southern Greenland to observe the Northern Lights (Aurora Borealis), a phenomenon expected to be particularly spectacular during this period. ... Auroras . The wonderful celestial spectacle of the aurora occurs when very energetic particles from the Sun reach the Earth's atmosphere via the solar wind. ... About GLORIA . ...

... Bad Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... What is the cause of auroral sound the sometimes occurs with an aurora? ... The Earth's magnetic field guides the particles to the north or south pole, where they hit air molecules. ... So aurorae are an electrical/magnetic phenomenon. ... This high, the air is extremely thin and not capable of supporting sound. ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! ...

In 2007, R Coronae Borealis (R CrB) went into a historically deep and long decline. ... The evidence pointing toward a white dwarf merger or a final-helium-shell flash origin for R CrB is contradictory. ... Along with the fact that R CrB shows significant lithium in its atmosphere, this supports the final-helium-shell flash. However, the relatively high inferred mass of R CrB and its high fluorine abundance support a white dwarf merger. ...

... 1 Least square fit over 6 year sliding window Gabor transform Expected ratio of () = - ~6 around 7 d i Synthesis · NIB pressure term O1 explained by tidal equilibrium model: clearly a lunar effect · At 13.6 d expected ratio works for IB (over continents) pressure term ; at 7 d expected ratio works for NIB (full) pressure term · Proportionality wind / pressure term is consistent with 2 facts Lunar tesseral ...

The Wanderer (E. Maresca 1961) When I'm the type of guy who will never settle down Where pretty girls are will you know that I'm around I kiss'em and I love'em ' cause to me they're all the same I hug'em and I squeeze'em they don't even know my name They call me the wanderer - yeah -the wanderer I roam around around around ...

... The changes are important to us, since they affect our time reckoning, our climate, and our understanding of the Earth's past. ... The Invariable Plane . ... The current location of the celestial north pole, the ecliptic north pole, and the north pole of the invariable plane in the northern sky. ... The north pole of the invariable plane lies in Draco, its south pole in Mensa. ... The precession of the celestial north pole, viewed from above the north pole and against the background of northern...