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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• Sun [Oulu]

Next: Radio pulse characteristics Up: An overview Previous: The structure of neutron . Typically Gauss for normal pulsars . Consistent with flux conservation during stellar collapse . ... Gravity dominates stellar structure . B field dominates exterior . Stellar surface is so small that observed emission is dominated by the magnetic field. ... Only field lines inside light cylinder are closed . Particles are constrained move along field lines . ...

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• Stellar wind and stellar disc models of dispersion and rotation measure
• Australia Telescope Compact Array Home Page
• Modeling the Observed Relationship

... Precisely one month ago, on 11 July 2009, the last active area of the new solar cycle disappeared from the surface of the Sun. Over the 30 days following this, neither observers on Earth nor devices in space have been able to detect the emergence of any sunspots. ... Therefore, it seems that our star has once again returned to a state of deep solar "winter", following several sparks of activity in May-June 2009. ... To date, this period has lasted 30 days. ...

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• The Russian TESIS Observatory will observe two solar eclipses from space
• Sunspots and active regions January 13, 2008
• Sunspots and active regions January 11, 2008

... Observatory . ... Science . ... Science Users Information > Science and Technical Meetings > Conferences 2015 > Stellar Halos 2015 . ... Science Users Information . Observing Facilities . La Silla Paranal Observatory . Paranal Facilities . ... Observing with ESO Telescopes . ... Data Handling and Products . ... Science Data Products Forum . ... Science Archive Facility . ... ESO Data . ... ESO Data Access Policy . ... ESO Science Newsletter . ... Final Announcement & Note to participants . ...

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• ESO - Baryons at Low Densities: the Stellar Halos around Galaxies
• Gaitee Hussain @ ESO
• Rivi: Magnetic Stars

Various types of stars have dust around them. In the well known case of the Pleiades the dust around the stars is unrelated to the stars, and is instead dust from an interstellar cloud that the Pleiades cluster has drifted into on its way through the galactic disk. ... The dust in interstellar space is observed in a variety of ways: due to its passive absorption of starlight ("extinction"), by its production of polarization in starlight, and then at long wavelengths due to its thermal radiation. ...

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• Stellar Photometry
• Stars as Observed in the Infrared
• A search for the cause of cyclical wind variability in O stars. Simultaneous UV

Magnetic Fields around Radio Galaxies Robert Laing (ESO) Laing et al. ... 2008) Negligible depolarization and 2 rotation Almost all Faraday effects must be due to foreground material How to fit depolarization caused by foreground Faraday rotation Complex polarization Rotation measure Integrate over a beam Observed RM for 0 2 rotation and depolarization Faraday rotation and depolarization 5.5 arcsec FWHM Faraday effects at high resolution FWHM = 1.5 ...

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• Astrophysics Group COAST Astronomical Results

Magnetic Stars, 2011, pp. ... Key words: stars: pre­main­sequence ­ stars: atmospheres ­ stars: individual: HD 101412 ­ stars: magnetic fields ­ stars: rotation ­ stars: variables: general 1 Intro duction In our previous studies we reported detections at a level higher than 3 for three out of seven Herbig Ae stars observed with the low­resolution spectropolarimeter FORS1 at the VLT (Hubrig et al., ... This is the first time the presence of element spots is detected on the surface of a Herbig Ae star. ...

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• HD965
• Galaxy sector, archive 2012
• Solar system sector, archive 2008

Observed stellar magnetic fields and some associated phenomena JD L 01/03/09 Leverhulme Lectures on Stellar Magnetism Sunspot magnetism Hale's discovery opened study of sunspot fields ­ ­ ­ ­ ­ ­ ­ 01/03/09 Sunspots typically have fields of 1- 3 kG Sunspots tend to come in pairs of opposite polarity In one hemisphere, north polarity usually leads and south trails ... If polar fields are different, chemistry could be too. ... Magnetic OB stars not always chemically peculiar. ...

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• http://star.arm.ac.uk/lectures/landstreet/slides/Lecture-1-intro-to-stellar-magnetism.pdf
• Solar Eclipse Observed Armagh Observatory
• Born-again stars

... Here some data observed on the 6m telescope with IFP installed in the OLD focal reducer are presented. ... Mkn 3: velocity field . ... NGC 5252: [OIII] image . ... NGC 5252 was observed 23 Feb. 1998 in the [OIII]5007 emission line with CCD TK1024 as detector. ... We observed the ionized gas velocity fields of the spiral galaxies with two purpose. ... Restored velocity field of NGC 157 in the reference frame rotating with the pattern speed overlaid on the Ha image of the galaxy . ... NGC 4100 . ...

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• Emission molecular bands
• About laboratory
• SCORPIO: IFP Gallery

... The Search of a pulsar Once the dedispersed time series is obtained, a Fourier transformation is performed. ... 2 Binary parameters The orbit of a pulsar , as well as any object, in a binary system is determined in its geometrical characteristics, space displacement and syncronised in time by the following parameters : Semimajor axis Eccentricity Longitude of periastron Binary period Time of ascending node a e PB T0 True spin period and observed spin period The ...

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• Searching the Environment around LyAlpha Absorbers
• Heiles Symposium Presentations
• REU Science Area

... The TRACE images may be used without restrictions in publications of any kind. ... These two images, taken on 18 November 2000 at 15:54UT and 16:11UT, respectively, show such an event: the red circle in the image to the left shows a region where many loops are cooling, with bright loop tops (the intensity scales with the square root of the image to reduce the dynamic range). ... See also a collection of images related to the Sun, other cool stars, and solar-terrestrial effects . ... Images | ...

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• HAEBE Atlas (Abstract)
• Mars Global Surveyor
• IBIS - Flat Fielding

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• Digital Stellar Spectra
• Astro-2 and the UIT Experiment
• Dark Matter in the Universe

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Moon . ... Comets and Asteroids . ... What changed our view of Chariklo is the discovery of a ring system around it, the first such feature found around a Solar System body smaller than a gas giant planet. ... Almost certainly the rings were born when a collision with a smaller asteroid blasted millions of tonnes of debris off CharikloтАЩs surface. ... A ring system detected around the Centaur (10199) Chariklo (Braga-Rigas et al.) ...

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• observing | Astronotes - Part 3
• Kepler-10b: world of lava oceans? | Astronotes
• observing | Astronotes - Part 4

... The Sun gives us light and heat, sustaining life on Earth. ... This uneven rotation, coupled with the churning of the upper layers, might well be what produces (by a "dynamo mechanism", described in a later section) regions of intense magnetic field, seen by observers on Earth as dark sunspots. ... Near sunspots those streamers seem to be shaped by the Sun's magnetic field lines, and above the Sun's poles they suggest field lines rising from twin magnetic poles like those of the Earth. ...

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• Spacecraft Observing the Sun and the Heavens above
• Satellites which look down and observe Earth
• Close-up of the Aurora

After some period of quiet Sun the exciting Sun-Earth connections event as the big magnetic storm was observed at January 10-11, 1997 by various satellites and ground-based instruments. Scientist meet this challenge with unprecedented activity and a few data bases was created in relation with solar event/magnetic storm on a few WEB-sites. ... According the Moscow observatory data the sudden storm commencement (SSC) take place at 01:08 Universal Time of January 10, 1997. ...

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• Space weather and ecology
• SINGULAR POINTS IN THE SOLAR CHROMOSPHERE

This artistтАЩs impression shows exoplanet HD 189733b as it passes in front of its parent star, called HD 189733A. HubbleтАЩs instruments observed the system in 2010 and in 2011 following a large flare from the star (depicted in the image). Following the flare, Hubble observed the planetтАЩs atmosphere evaporating at a rate of over 1,000 tons per second. ...

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• Glenn Chapleт??s Observing Basics: Star-hop around the Hare | Astronomy.com
• All around Aries | Astronomy.com
• At the end of the Cassini mission, could the probe be put into orbit around

... The fact that the Sun is a gas, however, lets different regions pass by one another fluidly. ... This differential rotation has interesting ramifications for the Sun's magnetic field. ... This bizarre distortion of the magnetic field results in active phenomena on the surface of the Sun. ... Magnetic instabilities in the solar field cause short, violent ejections of gas called solar flares-the most explosive events on the Sun. ... The Sun can also be viewed safely through special types of filters. ...

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• ASP: The Story of the Transit of Venus
• ASP: Guest Observer
• ASP: Munching on Lunar Cheese

Marc White . ... Turbulent entrainment processes may play an important role in the outflows from young stellar objects at all stages of their evolution. In particular, lateral entrainment of ambient material by high-velocity, well-collimated protostellar jets may be the cause of the multiple emission-line velocity components observed in the microjet-scale outflows driven by classical T Tauri stars. ... University of Amsterdam; STARPLAN, Copenhagen, Jul 2013 . ... E marc.white@anu.edu.au . ...

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• The Spinning Sun
• The SMS Survey
• Research Interests

Next: This Work Previous: Rotation Periods of ZAMS Stars . ... There are currently several groups involved in the studies of the rotation periods of PMS stars. ... Overall, there are about 100 rotation periods known for PMS stars. ... Furthermore, the stars with periods near 8 days also tend to have infrared excesses which can be interpreted as arising from disks. ... In the first interpretation, the gap occurs because locking mechanism holds stars at a eight day rotation period. ...

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• Evolutionary Effects
• Introduction
• Relations

Subatomic resolution on Cu(014)-O . 3nm x 3nm STM image of the Cu(014)-O 0.5ML surface measured with MnNi tip. ... This result has been discussed in Phys. Rev. Letters, 98, 206101 (2007) (A.N.Chaika, V.N.Semenov, S.S.Nazin, S.I.Bozhko, S. Murphy, K. Radican, I.V.Shvets, "Atomic Row Doubling in the STM Images of Cu(014)-O Obtained with MnNi Tips"). Image courtesy of A.Chaika. The image was measured in constant current mode using RT STM GPI-300. Copyright ИФТТ РАН, ЛСПП, 2006-2007 . ...

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• LSSS - Photogallery - Subatomic resolution on Cu(014)-O
• Problems of the 1-st International Astronomy Olympiad
• LHPP ISSP RAS