... Large Sunspot Group AR 9393 . ... Credit: MDI , SOHO , ESA , NASA Explanation: The largest sunspot group of the past ten years crossed the surface of the Sun late last month and early this month. The group was designated Active Region 9393 as it was the 9393rd region identified since counting officially began in 1973. ... Just after the end of the movie, on April 2, AR 9393 unleashed the largest solar flare of the last 25 years . ... Publications with keywords: solar maximum - sunspot . ...

... 2000 June 8 . Active Regions, CMEs, and X-Class Flares . ... Explanation: Space Weather forcasters are predicting major storm conditions over the next few days as the active Sun has produced at least three strong flares and a large coronal mass ejection (CME) since Tuesday, June 6th . ... X-ray hot plasma suspended in looping magnetic fields arcs above this region, cataloged as AR9026. AR9026 appears as a large group of sunspots in visible light images. ... About APOD | ...

... 2000 September 25 . AR 9169: A Large Sunspot . ... Explanation: One of the largest sunspots in recent years is now crossing our Sun . Dominating active region AR 9169 , the sunspot is the large dark complex visible below (west) and right of center in the above photograph of our Sun taken last Thursday. ... AR 9169 holds the largest sunspot yet produced during this Solar Maximum , the time of greatest sunspot activity during the Sun's 11-year magnetic cycle . ... About APOD | ...

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. ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

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 ...

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 . ...

Observation and modelling of main sequence star chromospheres. ... We compare our calculations to recent high res­ olution observations for selected stars in a narrow spectral range ((R­I) џ =0.875\Sigma0.05); we show that Hff line profiles behave as expected, with a tight correlation be­ tween the line width and equivalent width. ... We show that the hydrogen series dominate the radiative cooling in the spectral lines (form 40% to 90%) for Hff emission line stars. ...

Product: Report of Solar-Geophysical Activity :Issued: 2016 Apr 08 2200 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. ... Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: Solar activity has been at low levels for the past 24 hours. ... Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic field has been at quiet to minor storm levels for the past 24 hours. ...

Ganymede is the largest moon in our solar system, larger even than the planets Pluto and Mercury. ... Ganymede's surface consists of two main types of terrain: old, dark polygonal units, and young, bright valleys and ridges (see figure 11 ). ... In a similar way, hitting a large block of ice with a hammer makes white marks. ... Ganymede as seen by Voyager 2. ... Because Voyager couldn't spot any large impact craters, scientists have concluded that the moon's surface is young. ... Moon . ... Europa . ...

... 1993: . Based on the microwave observations of the Sun on the RATAN-600 and the Large Pulkovo Radio Telescope with high spatial and frequency resolution a new model of interaction of the photospheric and coronal magnetic fields in active regions was finalized. ... Archive . ...

Conference: The many faces of Centaurus A Is Centaurus A a typical Radio Galaxy? ... It is the closest of its kind Questions of interest Formation and evolution of RGs: Which mechanisms trigger radio activity? - mergers/collisions/interactions/cold accretion What is feeding the black hole? - circumnuclear regions: accretion disks/tori/infall/outflow Why are some galaxies active while others are not? ... Morganti et al. ... 2007) Radio Galaxy sample Radio source size: Cen A FR-I vs. ...

... Research . ... A rare hybrid morphology radio galaxy . ... In this project we will be able to investigate the environmental effect on star formation and galaxy evolution in individual galaxies falling into the cluster through radio observations of active galactic nuclei (AGN). Current models of galaxy evolution regulate the star formation rates within the simulated galaxies by invoking radio-mode feedback from AGN. ... Julie.Banfield@anu.edu.au . ...

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 ...

... They had expected to see impact craters like those on the other terrestrial bodies and from their number per unit area to estimate the age of Io's surface. ... This may have been the most important single discovery of the Voyager missions; it was the first real proof that the interiors of other "terrestrial" bodies are actually hot and active. ... A nalysis of the Voyager images led scienties to believe that the lava flows on Io's surface were composed mostly of various compounds of molten sulfur. ...

... 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 . ...

... Research objects and scientific purposes . Space scientific program includes development and launch of two supersmall spacecrafts "Universitetskiy" and "Kompas-2" intended for monitoring of radiation conditions near the Earth. ... All the studies conducted in the near-Earth space are characterised by strong radiation fields. ... The circular polar orbits, which cover all the near-Earth space, are the most favorable for comprehensive studies of the radiation conditions near the Earth. ...

M87 Gas Disk and Optical Jet (STSci) . SEDS Messier Catalogue M87 Page (U. Arizona) . Black Hole and Jet in M87 (NASA/GSFC) . ... The large scale radio structure is shown in the 3CRR Atlas . Richard White's Virgo Cluster page has optical and X-ray images of the large-scale environment of M87 . ... HST Observes Distant Radio Galaxies (STScI) . HST Finds a Black Hole in NGC4261 (STScI) . HST finds a Bare Black Hole Pouring out Light in NGC6251 . ... Alan Bridle's Home Page . ...

Automatic Classification of Sunspot Groups Using SOHO/MDI Magnetogram and White Light Images David Stenning March 29, 2011 1 Introduction and Motivation Although solar data is being generated at an unprecedented rate, the majority of sunspot classification is done manually by experts. ... This is to smooth the "white" areas in the magnetograms. ... Left: Inverse Magnetogram Right: "Opened" Inverse Magnetogram 6 Using the cleaned images, sunspot active-region "seeds" are obtain by thresholding. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Planets . ... This bizarrely shrunken planetary system was found by NASAтАЩs Kepler mission, hence the parent star has been named Kepler-11. ... Planetary scientist and Kepler science team member Jack Lissauer said ?These six planets are mixtures of rock and gases, possibly including water.тАЭ €аNone of these strange new worlds are likely to be home to any form of life; their surface conditions are simply too extreme. ...