... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

... The are two main sources of magnetospheric electric fields. The other is the solar wind related, dawn-to-dusk directed ("convection") field, and the other is the co-rotation electric field related to the rotation of the Earth along its spin axis. The electric fields have a strong effect on the drift paths of the magnetospheric plasma . ... The energetic particles, following the magnetic drifts more readily, are also affected by the convection field. ... Space Physics Text Book of Oulu ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2007 April 2 . An Active Sunspot Viewed Sideways . Credit Copyright : Hinode , JAXA , NASA . Explanation: Why are there dark spots on the sun? ... In the center of the above image is a sunspot, but not seen in the usual orientation --this sunspot is seen sideways. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

... AR1520: Islands in the Photosphere . ... Credit Copyright: Alan Friedman ( Averted Imagination ) Explanation: Awash in a sea of plasma and anchored in magnetic fields , sunspots are planet-sized, dark islands in the solar photosphere , the bright surface of the Sun. ... They lie in the center of active region AR1520, now crossing the Sun's visible face. ... Publications with keywords: active region . Publications with words: active region . ... Active Region 1002 on an Unusually Quiet Sun . ...

... Sun images . ... Sun flares . ... Active areas . April : 2016 . ... The following regions with sunspots can be now observed on the Sun's surface . Group number . ... Group length (in degrees) . ... Coordinates and other characteristics of active regions are issued for April 09, 2016 00:31 UT The following H-alpha plages without spots can be currently observed on the Sun's surface . ... Coordinates and other characteristics of active regions are issued for April 09, 2016 00:31 UT . ...

Nowadays at the Department the experimental and theoretical investigations, including astronomical and ionospheric observations, active experiments with space vehicles are taking place. ... Solar Corona physics and erruptive phenomenae. ... Stellar astronomy. ... The Department has organized and put into practice more then 50 expeditions for observation of Solar ecllipces, aurorae polaris, comets, meteor streams, controlled space experiments, and also for investigations of geophysical characteristics. ...

... 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. ...

... May 15, 1998 . TRACE and the Active Sun . Credit: Courtesy CFA , TRACE Team , NASA . ... It shows graceful arcs of intensely hot gas suspended in powerful looping magnetic fields which soar above a solar active region. ... By operating the TRACE instruments during the Sun's increasingly active phase, scientists hope to explore the connections between complex solar magnetic fields and potentially hazardous solar eruptions. ... About APOD > . ... NASA Technical Rep.: ...

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 . ...

... 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 . ...

The Earth's magnetosphere global structure is conditioned by the interaction of the Solar wind and Earth's magnetic field. ... Many various magnetospheric models are available in the NSSDC . ... Fairfield D. H., Average and unusual location of the Earth's magnetopause and bow shock, J. Geophys. ... Stasiewicz K., Polar Cusp Topology and Position as a Function of Interplanetary Magnetic Field and Magnetic Activity: Comparison of a Model with Viking and other Observations, J. Geophys. ...

... 1.Magnetic and magneto-elastic properties of heavy rare earth metals. ... High magnetic fields of 100 kOe and more were necessary to saturate the magnetization of havy rare earth metals. ... It was shown that the effective exchange field theory is sufficient for the description of the magnetic order in heavy rare earth metals and their compounds. ... The duality of the state of the magnetic carriers in the traditional 3d-magnetic materials. ... LHPP ISSP RAS © 2004 All rights reserved ...

... Chmyrev V.M., Isaev N.V., Serebryakova O.N., Sorokin V.M., Sobolev Ya.P., 1997. ... Sorokin V.M., Yashchenko A.K., 2000. ... Sorokin V.M., Chmyrev V.M., Yaschenko A.K., 2001. ... Sorokin V.M., Chmyrev V.M., Yaschenko A.K., 2002. ... Sorokin V.M., Chmyrev V.M., Yaschenko A.K., 2003. ... Sorokin V.M., Isaev N.V., Yaschenko A.K, Chmyrev V.M., and Hayakawa M., 2005. ... Sorokin V.M., Yaschenko A.K., Chmyrev V.M., and Hayakawa M., 2005. ... Sorokin V.M., Yaschenko A.K., Chmyrev V.M., Hayakawa M., 2006. ...

... SAO RAN RATAN-600 EXCURSIONS 40 YEARS of R/T REFERENCES . ... GPS radio sources . ... Thursday, April 30, 10-00 . ... Friday, December 19, 10-30 . ... N. Bursov, V. Chaykin, A. Storozhenko "Preliminary results of RATAN-600 antenna measurements with the help of the geostationary Satellite Turksat 2A/3A". ... The basic results. ... Information-analytical system of estimating the parameters of radio sources in continuum with the RATAN-600 (the message for a conference, IPA St. Petersburg). ......

An M8.7 (quite large) solar flare erupted from the Sun accompanied by a large coronal mass ejection (CME). The telltale brightening of the flare early Jan 23, 2011, was followed by a burst of particles into space, then superheated magnetic loops spun up in coils above the active region as the magnetic field began to reorganize itself. The eruption sent a stream of fast-moving, highly energetic protons toward Earth, igniting the most intense solar energetic particle storm since 2005. ...

The process of correcting for the effect of the variation in the sensitivity of the WFPC2 with field position is known as flat-fielding, or flattening. ... Instead, several assets are available to estimate the flat field and monitor any changes -- these include pre-launch SLTV optical stimulus flats, Earth flats, calibration channel flats (VISFLATS), and internal flats (INTFLATS). ... There are also two types of on-board flats available in WFPC2, which can be used to monitor changes in the flat field. ...

... Pre-university education . ... Samara region . SSAU History . SSAU roadmap . ... Samara State Aerospace University (SSAU) will take an active part in the work of space activities of the United Nations organization (UNO). ... The road map shape on inclusion of Samara University into implementation of the UN Program on Space Applications was outlined at the roundtable discussion with the University teachers and specialists and at the meeting with SSAU Rector Yevgeniy Shakhmatov. ...

... Be Stars . ... Magnetic Stars . ... Magnetic fields in stars are common. ... The earliest star known to have a magnetic field is the O-star 1 Ori C, one of trapezium stars in the central cluster of the Orion nebula of spectral type O6. ... The non-existence of more rapidly rotating magnetic stars was thought to be an immediate consequence of the magnetic field: The field would help the star to get rid of angular momentum by forcing the wind into co-rotation, and so to brake down the star. ...

... Submitted by Al Takeda on 05/25/2012 09:05:53 . Sunspot 1476 . While checking out my equipment for the Venus transit, I imaged the naked eye sunspot #1476. ... Sunspots are temporary features in the Sun’s photosphere that are caused by intense magnetic field lines emerging from the interior. The spot appear dark because it is relatively cooler then the surrounding photosphere. ... ATMoB Clubhouse, Westford, MA, 12 May 2012. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . Sun . ... March . ... The extent of the solar eclipse of 3 November€а 2013 at 13:22 UTC as seen from Accra, Ghana. We will see a similar sight.€а (Image credit: Kwabena under Creative Commons Licence) . ... Your viewing location is not important as long as it offers an unobstructed view of the south eastern sky.. ... You can use ?eclipse glasses? to view the Sun, these are made from aluminized Mylar filter material. ...