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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• Spacecraft Observing Earth's Space Environment
• Close-up of the Aurora
• Solar wind and IMF [Oulu]

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 17 - 23.02.2014, Forecast on 24.02 - 02.02.2014 , Carrington Rotation 2147 (11,73.02.2014) SUNSPOT-FORMING ACTIVITY REMINDER AT MEDIUM AND HIGH LEVELS, GRA- DUALLY INCREASING TOWARDS THE END OF PERIOD. ... NEXT WEEK IS EXPECTED THE HIGH AND THE MODERATE LEVELS OF SUNSPOT- FORMING ACTIVITY. ... FLARE ACTIVITY WAS AT THE MODERATE LEVEL 20 AND 23.02, AND THE LOW LEVEL IN OTHER DAYS. ... G - geoeffectivity in last solar rotation; A - active. ...

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• http://www.izmiran.rssi.ru/services/saf/archive/en/2014/obzor20141018.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150323.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150413.en.txt

P. Frisch - Warm partially ionized interstellar gas at the Sun . ... W. M. Goss - Time variations in small-scale galactic HI structure toward 3C138 . S. Stanimirovic - Does tiny-scale atomic structure exist in the ISM? ... T. Bania - The distance to molecular clouds via HI self-absorption . ... C. Heiles - Arecibo Millennium Survey statistics of magnetic field, column density and turbulence in the CNM . R. Crutcher - Magnetic fields in molecular clouds . ...

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• CHVCs observed with Arecibo
• Submitting New Observing Modes to AO
• Spectral-Line Observing

... The most spectacular view however is from space, where large areas of aurora can be observed simultaneously, even the entire polar cap. ... Such pictures often show a continuous ring of aurora around the polar cap (picture above), caused mostly by electrons leaking out along magnetic field lines, from the plasma sheet of the Earth's magnetic tail. ... Field lines from the auroral oval are believed to lead to the plasma sheet. ... A near-Earth circular polar orbit has many uses. ...

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• Spacecraft Observing Earth's Space Environment
• Planetary Magnetism
• The Sun

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Investigations of the ionospheric response to strong magnetics storms which are usual for our latitudes, are of great interest. ... In the figure, we present ionospheric parameter dynamics during three perturbed days in July 2000. ...

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• East Siberian Center for the Earth's Ionosphere Research. Coherent echo.

... 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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• IBIS - Flat Fielding
• CHIANTI atomic database

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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• ATNF Daily Astronomy Picture
• The observed distribution
• Velocities in Miriad

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• Comments

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The stars of the middle main sequence have relatively quiescent outer layers, and unusual chemical abundance patterns may develop in their atmospheres. ... At present, little is known about the time evolution of these anomalous abundances, nor about the role that diffusion may play in maintaining them, during the main sequence lifetime of such a star. ...

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• J.G. Doyle, Research Astronomer
• Solar Eclipse Observed Armagh Observatory
• Broadening of Si VIII lines observed in the Solar polar coronal holes

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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• Relations
• Period Criteria
• Rotation Periods of ZAMS Stars

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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• http://www.mrao.cam.ac.uk/~mh475/poster.pdf
• Example of an OOF analysis for the GBT
• Introduction to phase correction for ALMA Bojan Nikolic web pages (r. 329)

... The improvement will be more pronounced in our crowded Wide Field Camera (WFC) images, and may be increased further through use of a more sophisticated method of combining the individual dithered images. Our analysis allows us to check for point spread function shape variations in the HST Planetary Camera (PC) field. ... In crowded field images, we are deriving information about the faint end of the luminosity function (LF) from the texture of the image background. ...