... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. November 19, 1998 . Bright Leonids . ... Explanation: Rich in bright and awesome fireballs , the Leonid Meteor Shower came early this year. In fact, judging from meteor watcher reports the peak came nearly 15 hours earlier than the best predictions . ... About APOD > . ...

... From the chain visibility point of view, it is very recommended to look at the Javascript movies , especially if the frame rate can be not regulated in your MPEG player. ... The non-CH-associated large-scale chains visible on the SOHO/EIT images at three wavelengths of 171, 195 and 284 as well as on the MLSO/HAO He I 10830 spectroheliogram of December 16, 1997. ... The SOHO/EIT movies at 171 and 195 show the chain dynamics on June 1-3, 1998. ... Javascript movie (230 KB), SOHO/EIT, 171 . ...

... Gallery . ... Home Gallery . ... Lecture Series 2014-2015 . ... AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . ... This Month's Sky . ... This Month's Sky - 2015 . This Month's Sky - January 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... A detailed study of two consecutive bright points observed simultaneously with CDS, EIT and MDI is presented. The analysis of the evolution of the photospheric magnetic features and their coronal counterpart shows that there is a linear dependence between the EIT Fe XII 195? flux and the total magnetic flux of the photospheric bipolarity. ... In a follow-up study, we used wide slit (90arcsec240arcsec) movies of four EIT coronal bright points (BPs) obtained with CDS. ...

... Observatory . ... Science . ... Science Users Information > Data Handling and Products > Data Reduction FAQ > My data shows an extended, bright feature - what can this be? ... Observing Facilities . ... Observing with ESO Telescopes . ... Science Data Products Forum . ... ESO Data . ... You might also want to check http://www.eso.org/sci/observing/PublicSurveys/useful_links/OmegaCAM_images.html where we provide a collection of example OmegaCAM images, illustrating some special data features. ...

... An ionospheric trough is a region of decreased F layer plasma density. ... It is quite typical to make a distinction between the sub-auroral troughs at mid-latitudes, and high-latitude troughs within the auroral region or polar cap . ... working for mid-latitude trough and some types of high-latitude troughs, like the polar hole . ... Collis, P. N., and I. HДggstrЖm, Plasma convection and auroral precipitation processes associated with the main ionospheric trough at high latitudes, J. atmos. terr. ...

Scientists Discover Surface Features on Titan . ... Scientists for the first time have made images of the surface of Saturn 's giant, haze-shrouded moon, Titan. ... Peter H. Smith of the University of Arizona Lunar and Planetary Laboratory and his team took the images with the Hubble Space Telescope during 14 observing runs between Oct. ... About three weeks before Cassini's first flyby of Titan, the spacecraft is to release the European Space Agency's Huygens Probe to parachute to Titan's surface. ...

There is often dust associated with ionized regions. Compact HII regions usually have associated dust from a molecular cloud in which the massive star is being "born". ... For such stars the dust is not produced by the star, and a variety of dust features are observed. The planetary nebulae also usually have associated dust from the previous stage of evolution where they were either carbon stars or M-type giants. ... The feature near 11.5 microns in the IC 418 spectrum may be due to SiC dust. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... solar system . ... ISON at its brightest . ... The long-awaited predawn appearance of Comet ISON (C/2012 S1), potentially one of the brightest such objects in many decades, no doubt will leave many observers bleary-eyed as they go about their normal daytime tasks. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter...

... Sun images . Magnetic storms online . Sun flares . ... November : 2010 . ... X-ray emission of the Sun from 08.11.2010 to 09.11.2010 (GOES-15) . No solar flares of C, M and X-class were observed today . No solar flares of C, M and X-class were observed yesterday . Last updated: November 10, 2010 00:00 UT . ... 1953-2016 Laboratory of X-ray astronomy of the Sun, LPI RAS, Russia . ... 7(499)132-65-96, Fax: +7(499)132-65-97 . ...

... Meteor Milky Way . 26.11.1998 . ... A Leonid Bolide Over Kansas . ... The 1998 Leonid Meteor Shower featured many bright events. ... Observers there reported a peak rate for the 1998 Leonid Meteor Shower of about 600 meteors per hour. ... Goodness, Gracious, Green Balls Of Fire!", might have been an appropriate theme song title for the 1998 Leonid meteor shower. ... Rich in bright and awesome fireballs, the Leonid Meteor Shower came early this year. ... Close Up of the Bubble Nebula . ...

Physics of Solar corona, physics of aurorae, Solar-Terrestrial connections, lithosphere-ionosphere connections. Practical Astrophysics . General Astrophysics . ... N.I.Dzubenko. Heating of the upper atmosphere during auroral and auroral . ... N.I.Dzubenko, V.M.Ivchenko, G.P.Milinevsky. ... N.I.Dzubenko, A.P.Zhilinsky, I.A.Zhulin et. al. ... solar activity cycle by photometric data. ... Kyiv, 1994. 240p. N.I.Dzubenko. The response of aurora to sharp variations of the state of . ...

... Articles | ... Forums . ... 230 deg . 49 deg . ... 130 deg . ... More Info . ... 210 deg . ... 168 deg . ... 249 deg . ... 195 deg . ... 271 deg . ... 110 deg . ... 338 deg . ... July 15 . 247 deg . ... 224 deg . ... 340 deg . ... July Phoenicids (PHE) . ... August 10 . 341 deg . ... 339 deg . ... 307 deg . ... 334 deg . ... 335 deg . ... 286 deg . ... 327 deg . ... 262 deg . ... 102 deg . ... 153 deg . ... 117 deg . ... December 2 . ... 123 deg . ... 100 deg . ... www.astronomy.net . ...

Statistics of sunspot activity . The sunspot indices . ... The solar regions . ... 2015 . ... November . ... November, 2015 . Visual indices of solar activity by author's observations . ... Average . ... 0.00 . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Meteors and Meteorites . ... Monthly Sky Notes . ... November . ... Observers can expect around 10 meteors an hour on the night of the peak, although every 33 years the Leonids experience a phase of increased activity as their parent comet passes the Earth once again. ... Around€а 14 November, the€а faint and difficult to see Andromedids will be gracing the nightтАЩs sky although this may be in the range of about 3 meteors an hour. ...

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

... This is a preliminary summary of the event on November 24, 1996, considered during the INTERBALL Workshop in Kiljavanranta, Finland, February 1998. ... Pronounced plasma sheet thinning (Bz decrease) . ... Particle burst observed inside the Polar Cap and in tail lobes . A short burst of particles detected by the Auroral Probe particle detectors during the Polar Cap crossing at 21:45 UT, almost simultaneously with the Tail Probe detectors registration of the particle burst inside the North Lobe. ...

... This proposal seeks to investigate the properties of the GRB-SN and therefore enhance our understanding of the GRB central engine, GRB progenitors, and the associated physical properties. ... Their results favour low metallicity, sub-luminous galaxies with L A significant part of Rapoport's PhD thesis will be dedicated to better understand the Supernovae that become GRBs, and to investigate the connections between GRB central engines and the progenitor stars that explode. ...

Asteroid 2005 YU55 was listed on NASA's "Sentry Risk Page" as having as small (about one in 10 million) chance of hitting the Earth in the next century. We observed this asteroid with the Arecibo Planetary Radar system on April 19-23 2010. ... We obtained radar images of asteroid 2005 YU55 at 11 PM local time on 2011 Nov 9 using the Arecibo Observatory Planetary Radar System in Puerto Rico and the Robert W. Byrd Green Bank Telescope in West Virginia. ... Last modified 2011 November 14 . ...

The following activities are included in the Universe at Your Fingertips guide. ... Clicking on each activity will take you to a "reviews" page where you can post a review, or read reviews posted by others who have used the activity. ... Activity Online . ... MOON AND PHASES . ... Observing Phases and Features . ... Modeling Moon Phases . ... SUN AND SEASONS . ... Observing the Sun Safely . ... Observing Where the Sun Sets . ... Making Pictures of Motion . ... Morning Star and Evening Star . ...