... Active Regions, CMEs, and X Class Flares . ... AR9026 appears as a large group of sunspots in visible light images. The three intense flares were all X-class events, the most severe class of solar flares based on X-ray flux measurements by the earth-orbiting GOES satellites. ... Publications with keywords: Sun - flare - active region - solar flare - space weather . Publications with words: Sun - flare - active region - solar flare - space weather . ... An X Class Flare Region on the Sun . ...

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• Active Region 1002 on an Unusually Quiet Sun
• Астронет > Active Region 1002 on an Unusually Quiet Sun
• A Large Active Region Crosses the Sun

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. June 16, 1998 . An Active Region of the Sun . Credit: A. Title ( Stanford Lockheed Institute ), TRACE , NASA . ... This false-color image depicts an active region near an edge of the Sun . Hot plasma is seen exploding off the Sun's photosphere and traveling along loops defined by the Sun's magnetic field . ... About APOD > . ...

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• APOD: October 18, 1999 - NGC 3603: An Active Star Cluster
• APOD: May 15, 1998 - TRACE and the Active Sun
• A collection of images

... X CB (X) Opening of a set X by a disk B. Closing of a set X by a disk B. Science-Driven Feature Selection (a) (b) Mount Wilson Classification The Mount Wilson classification scheme groups sunspots into four classes based on the complexity of magnetic flux distribution in associated active regions [1]: class : groups dominated by a single unipolar sunspot class : a pair of sunspots of opposite magnetic ... Convex hulls are utilized to measure polarity mixture in (j). ...

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• V. Kashyap and J. Drake Figure 1a - Interactive Figure Using the Ov Applet
• A Region mask for a radial profile in concentric, elliptical annuli

. Home . News . Gallery . Events . Twitter . Press Releases . Links . Contact Us . Calendar . Press & Web Coverage . Previous . Next . List . Deirdre Kelleghan kept observing the Sun and she sent us a new wonderful drawing: "Active Region 10999, June 20th 2008 13:45 UT; PST 40/8mmTVP eyepiece/50X upscaled by eye; soft pastels and graphite on black paper". Thank you, Deirdre! . Tuesday, 24 June 2008 01:52 . International Year of Astronomy, Ireland National Node . [Back To Top] .

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• Armagh Observatory
• Terry Mosely's Bulletins
• J.G. Doyle, Research Astronomer

LARGE-SCALE PHENOMENA AT THE SUN ASSOCIATED . WITH FILAMENT ERUPTIONS OUTSIDE ACTIVE . ... Considering the 12.09.1999 event as an example, we analyze manifestations of large-scale disturbances associated with coronal mass ejections (CMEs) caused by filament eruptions outside of active regions. ... The filament eruption occurred in relatively weak magnetic fields, but it was accompanied by larger-scale phenomena than flare events do. ...

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• Oct-Nov 2003
• Chains and CMEs

NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Astronomy . ... During the last 48 hours, solar activity of moderate-to-large intensity was registered with two class X events (one was a maximum X5), and also events of class M and C. Two Coronal Mass Ejections (CME) occurred in March 4 and 5 reached the Earth this (Thursday) morning, March 8 at 11 UT (7 AST), and large variations in the Earth's magnetic field and energetic particle precipitation into the poles are expected. ... Arecibo Observatory €а . ...

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• REU Science Area

Data Archive . Video-records archive . ... 1997 | ... Time (UT) Counter Remarks _______________________________________________________________________________ 05.01. 10:29:17 2:06:42 scan disk 11:58:23 2:11:19 active regions 06.01. 09:49:51 2:12:17 scan disk 10:56:24 2:19:10 active regions 12.01. 09:39:12 2:19:59 scan disk 10:03:41 2:27:51 active region 10:05:09 2:28:34 filament 10:07:17 2:29:10 ...

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• IDL programs

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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... Solar flare activity is produced by the processes of accumulation and release of energy in an active region. ... In the framework of study of solar active regions, producing powerful flares the researchers from the RATAN-600 radio telescope have detected sources with features in the form of a sharp drop in the intensity of polarized radiation in various parts of the recorded frequency range (2-16GHz), sometimes changing the sign of polarization. ...

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• Solar system sector, archive 1994
• Solar system sector, archive 2010
• Solar system sector, archive 1993

... For us to see them from such great distances, quasars must be producing enormous energy -- they are about 1000 times brighter than an average galaxy! ... One of their choices for the energy source of quasars was a black hole. ... On the one hand, it may seem difficult to think that mere friction between bits of matter could account for the energy of a quasar, but, on the other hand, gravity is unimaginably strong near a black hole. ... How does matter actually rush towards the black hole? ...

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• ASP: Star Science in the Autumn Sky
• ASP: Astronomy Behind the Headlines

... A database on solar active regions has been implemented in IDL (Interactive Data Language). ... Full-disk 17 GHz radio maps produced by the Nobeyama Radioheliograph provide the basis for the database. Researchers of solar activity often need to access solar active region data. ... So far, we have created an IDL-based database on daily active region data from 1992 July 1 to 1994 December 31 (NOAA 7213 thru NOAA 7821) 2 . ... number of active regions visible on the disk; . ... IDL 1 . ...

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• Near-IR Imaging of Star-forming Regions with IRAF
• Adaptive and Active Optics

... Aurora - June 23, 2015 . Sunspot, Active Region AR2371, produced an M2 class flare and sent a coronal mass ejection toward the Earth on June 21st. ... A meteor trail, airplane and clouds are also in the image. 30-second image with dark slide, Samyang 14mm, f/2.8 lens imaged at f/5.6, Unmodified Canon T1i on a Tripod, No filter, ISO 800, processed with Adobe Photoshop. 00: 17 hrs EDT, 23 June 2015, Harvard, MA. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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T H E AU S T R A L I A T E L E S C O P E C A M PA I G N T O S T U DY SOUTHERN CLASS I METHANOL MASERS M.A.Voronkov (ATNF), K.J.Brooks, A.M.Sobolev, S.P.Ellingsen, A.B.Ostrovskii, J.L.Caswell contact: Maxim.Voronkov@csiro.au Introduction Class I methanol masers (e.g. 9.9 , 25, 104 GHz ) Maser spots are spread around the protostar location Avoid strong infrared ... This fact supports the idea that some class I masers reside in the interface regions of outflows. ...

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• NGC 253
• Active Optics
• AGN workshop

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

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• Observing Resources for Amateur Astronomers ? Part 1: Beginning Observers ?
• Solar Bridge Across New York Harbor ? Amateur Astronomers Association of New

Active region 1158 let loose with an X2.2 flare late on February 15, the largest flare since Dec. 2006 and the biggest flare so far in Solar Cycle 24. Active Region 1158 is in the southern hemisphere, which has been lagging the north in activity but now leads in big flares. Here is a blowup of the flaring region taken by NASA's Solar Dynamics Observatory in the extreme ultraviolet wavelength of 193 Angstroms. ... NASA/SDO ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B14B312AC-BF8C-4D45-8CD4-F244719E2ACC%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B21AF76B2-935D-4253-A5FE-798407979CC8%7D
• Hubble sees NGC 7090 т?? an active star-forming galaxy | Astronomy.com

... ESO PR Photo 07a/01 . ... ESO PR Photo 07b/01 . ... Caption : PR Photo 07a/01 shows Comet Hale-Bopp , still active at a distance of nearly 2,000 million kilometres from the Sun. ... This is quite unusual for a comet and is clearly confirmed on the present photo ( PR Photo 07a/01 ) from the WFI camera on the MPG/ESO 2.2-m telescope at La Silla, obtained a few days ago. ... ESO-Chile . ... ESO PR Photos 07a-b/01 may be reproduced, if credit is given to the European Southern Observatory (ESO). ...

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• Closer to the Monster | ESO
• The Innermost Region of the Active Galaxy NGC 1068 | ESO
• The Innermost Region of the Active Galaxy NGC 1068 | ESO Ireland

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 June 7 . Up Close to Jupiter's Moon Io . ... The surface of Jupiter 's moon Io is home to violent volcanoes that are so active they turn the entire moon inside out. ... In general, the bright areas are higher terrain than the darker areas, but some areas of the surface appear eroded by an unknown process. ... About APOD | ...

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• APOD: 2000 April 13 - Exploring Comet Tails
• APOD: 2000 May 27 - M51: The Center Of The Whirlpool
• APOD: 2000 February 11 - XMM-Newton First Light: X-Rays From The LMC

... Region 9373 (S07W43) produced several small C-class flares. ... 1610 0824 //// 0824 SVI U RSP 025-042 III/1 . 1620 + 0844 //// 0851 SVI C RSP 025-170 III/2 . 1630 + 0901 //// 0902 LEA C RSP 025-150 III/1 . 1640 + 0953 //// 0956 LEA C RSP 025-080 III/1 . ... 1910 + 1036 1042 1059 SVI 3 FLA S06W15 SN ERU 9373 . 1910 1036 1041 1055 F RBR 3000 20 9373 . ... 2210 + 0846 0847 0847 SVI G RBR 410 64 9373 . 2210 + 0846 //// 0847 SVI C RSP 025-180 III/2 9373 . ...

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• Публикации
• My publications
• Publication Search

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Telescopes and Observatories . ... The majestic star-forming region in the Lagoon Nebula. The pale ring to the right is an internal reflection in the telescope.€а (Image credit: ESO/ VPHAS+/ V. Kalari and J. Vink (Armagh Observatory) . ... The 18 component images were further processed twice. ... Venu and his colleagues use images like this to identify individual young forming stars in the Lagoon Nebula and determine their ages. ...

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• Aurora - Northern Lights viewed from Ireland | Astronotes
• NGC4666: Secrets of a Starburst Galaxy | Astronotes
• Viewing the Partial Solar Eclipse of 20 March 2014 | Astronotes

The Sun is our nearest star and the source of energy for life on Earth. ... For centuries astronomers wondered whether they were clouds floating in the Sun's atmosphere, but we now know that they really are huge regions of magnetic field, about as intense as the field at the poles of an iron magnet. ... Such abrupt events were named solar flares , and what made them especially interesting was that occasionally, after a prominent flare, a magnetic storm would erupt on Earth. ...

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• Space Weather Current Conditions
• On-Line Glossary of Solar-Terrestrial Terms
• Deformed arcs [Oulu]