Statistics of sunspot activity . The sunspot indices . ... NGDC's observations . The solar regions . ... Average annual indices . ... April . ... April, 1984 . Visual indices of solar activity by National Geophysical Data Center . ... Average . ...

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... Magnetic storms online . ... Geomagnetic activity forecast . ... April : 2015 . ... No magnetic storm is expected . From 2 April 2015 to 28 April 2015 the following magnetic storms and disturbances are expected: . April 07, 2015 geomagnetic disturbances . ... April 17, 2015 geomagnetic storm of level G1 (minor) . ... April 21, 2015 geomagnetic storm of level G2 (moderate) . April 03, 2015 geomagnetic disturbances 2 April 2015 - 28 April 2015 . ... Probability of a magnetic storm . ...

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• Space weather forecast April 02, 2015
• Space weather forecast April 03, 2015
• Space weather forecast April 06, 2015

... re03qr (for 7 April from 11-20 UT) . re03qs (for 8 April from 12-20 UT) . ... Next message : Jamie.McCallum_at_email.protected: "Re: Schedules for re03qr, re03qs, re03qt observations with RadioAstron (7-9 April)" . ... Next in thread : Jamie.McCallum_at_email.protected: "Re: Schedules for re03qr, re03qs, re03qt observations with RadioAstron (7-9 April)" . Maybe reply : Jamie.McCallum_at_email.protected: "Re: Schedules for re03qr, re03qs, re03qt observations with RadioAstron (7-9 April)" . ...

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• THE SCHED USER MANUAL Version 11.3 Update 1 of April 14, 2014
• VLBI Observations

SPACETELESCOPESCIENCEINSTITUTE Activities: 24 March ­ 14 April 1994 SMOV Calibration Activities: 5619: FOS/RED Small Aperture Location proposal was run on March 27 all observations successful detailed analysis proceeding (Evans and Koratkar) RESULT: Observations allowed Science in 4.3 or 1.0 apertures with binary search target acquisition directly into the aperture, both detectors. ...

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• HST this week: 105
• April 2016 STAN
• HST this week: 113

Asteroid 2005 YU55 was listed on NASA's "Sentry Risk Page" as having as small (about one in 10 million) chance of hitting the Earth in the next century. We observed this asteroid with the Arecibo Planetary Radar system on April 19-23 2010. ... We obtained radar images of asteroid 2005 YU55 at 11 PM local time on 2011 Nov 9 using the Arecibo Observatory Planetary Radar System in Puerto Rico and the Robert W. Byrd Green Bank Telescope in West Virginia. ... Last modified 2011 November 14 . ...

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• asteroid 200YU55
• Arecibo Galaxy Environment Survey (AGES)

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2011 April 19 . The GRB 110328A Symphony . ... Explanation: A symphony of planet-wide observations began abruptly on March 28 when the Earth-orbiting Swift satellite detected a burst of high-frequency gamma-rays from GRB 110328A. When the same source flared again after a 45 minute pause it was clear this event was not a typical gamma-ray burst . ...

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• APOD: 2002 April 14 - RX J185635-375: Candidate Quark Star
• APOD: April 21, 1998 - Water From Orion
• APOD: April 3, 1998 - Hen 1357: New Born Nebula

... Within the transnational Access program of SOLARNET, European investigators can apply for observing time with the European instruments IBIS and ROSA , which are installed at the Dunn Solar Telescope of the US National Solar Observatory ( DST/NSO ). ... Periodic calls for proposals will be published for requesting SOLARNET observing time with the European instruments IBIS and ROSA, installed at the Dunn Solar Telescope of the US National Solar Observatory (DST/NSO). ... SOLARNET Access . ...

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• APOD: April 12, 1999 - Nearby Spiral Galaxy NGC 4945
• Leonardo, aprile 2010
• Leonardo a Firenze il 28 e 29 aprile 2012

... This site requires Javascript to function correctly. ... ASRAS HOME . ... About ASRAS . Join ASRAS . ... ASRAS Board Members . Our Observing Site . ... April 2016 . ... ASRAS MONTHLY MEMBERSHIP MEETING - Friday April 1 at RIT (ASRAS Events) . ... ASRAS Board members meeting - monday April 4 @ U of R Bausch and Lomb bldg (ASRAS Events) . ... Messier Marathon (Member Observing) CANCELLED (ASRAS Events) . ... ASRAS HOME Beginners Mees Observatory Contact US About ASRAS Our Observing Site Login . ...

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• ASRAS HOME
• THE BRIGHT SUPERNOVA 1991T IN NGC 4527; AN AMATEURS PRESPECTIVE
• Supernova 1999an in IC 755

... 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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Program Id: . ... UTC End Time: . Astronomer/PI Name(s): . ... Observer Name(s): . Nightlog Day: Sunday Monday Tuesday Wednesday Thursday Friday Saturday Month: January Febuary March April May June July August September October November December Day (DD): Year (YYYY): Full Night A (First half) B (Second half) Special Schedule . ... Note: Open this weather logfile program in another browser window. Please copy and past the resultant info below at the end of the night) . ...

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• ARC Progress Reports
• Untitled Document

Armagh Observatory reports that April was drier and sunnier than average. ... There were 164.2 hours of sunshine, compared with the average of 133.2 hours. The mean monthly temperature was 8.3 degrees Celsius, a little above the average of 8.1 degrees. There were 15 nights with ground frost and 3 days with air frost. ... FOR FURTHER INFORMATION PLEASE CONTACT: John McFarland at the Armagh Observatory. ... 028-3752-2928; FAX: 028-3752-7174; E-mail: jmf arm.ac.uk; URL: climate.arm.ac.uk . ...

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• Observations with the Faulkes Telescopes
• Latest News
• Photos & videos from the astronomy show of Friday 16 April 2010 | OASES Over us

THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON APRIL 2013 HAS MADE W apr.= ... THE INTERNATIONAL DAILY VALUE OF RELATIVE SUNSPOT NUMBER FOR 2013, APRIL ACCORDING DATA OF 70 SOLAR OBSERVATORIES HAS MADE 1.. 53 m 6.. ... Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 29.04 - 05.05.2013 , Forecast on 06.04 - 13.05.2013, Carrington Rotations 2136 (17,78.04.2013) SUNSPOT-FORMING ACTIVITY OF THE SUN CHANGED FROM THE AVERAGE TO THE HIGH LEVELS. ... Class E(1-8A) AR RII/IV CME X / opt. ...

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• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150427.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2014/obzor20140505.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2012/obzor20120507.en.txt

EPIC-pn Burst Mode X-ray loading and rate-dependent CTI calibration Jan-Uwe Ness ESAC 09 April 2015 XRL / RDCTI corrections in burst mode JU Ness ESAC , April 9 2015 Energy offsets caused by X-ray loading In 2010, significant effects from X-ray loading ( XRL ) were discovered in the timing mode and burst ... Thus the values of a0, a1, a2 control the rate dependent correction and are determined empirically. ...

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• http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/201504/Santos_Cal_2015.pdf
• http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200704/Plucinsky.pdf
• http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0314-1-0.pdf

... 28 April 2010 FTT kick-off meeting 5 Where are we today? Use results from this to secure funds for expansion post 2012 Majority of funds from NMT ­ possibility of some STFC support 28 April 2010 FTT kick-off meeting 6 The FTT /NAS system Ensures that the light beam collected by a telescope is sent down the beam relay pipes in the right direction The FTT /NA system monitors the light The active secondary mirror redirects it 28 April 2010 FTT kick-off ...

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• Astrophysics Group Exoplanet UK Community Meeting ? Cambridge, April 14-16 2014
• Astrophysics Group Posters
• Astrophysics Group - Department of Physics - University of Cambridge B. Nikolic

. September 2011 April 2011 March 2011 February 2011 . January 2011 November 2010 April 2010 February 2010 . September 2008 August 2008 May 2008 February 2008 .

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Peremennye Zvezdy ( Variable Stars ) 32 , No. ... We report on a new episode of decretion disk formation in the IGR J06074+2205 system. ... From a study of three HeI lines, the rotational velocity of the star was determined as km/s. After five years of spectroscopic monitoring of IGR J06074+2205 (Reig et al. 2010), a reversion from emission to absorption of the H line and hence disappearance of the equatorial disk was reported. ... Reig P., 2011, Astrophys.& ...

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• Астронет > Северное сияние над Лапландией
• XWare > APOD
• April Fools Day More Intense On Mars

... Telescopes . ... The International Conference "Dark Ages and White Nights (Spectroscopy of the CMB)" (June 20-24, 2016) . ... The International Conference "Stars: from collapse to collapse" (October 3-7, 2016) . The traditional annual competition conference of scientific and scientific-engineering papers of the Observatory staff members . ... A session of the Dissertation Council (October 16, 2015) . ... International scientific conference "Large Optical Telescopes" (October, 10-13, 2011) . ...

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• About SAO RAS
• RATAN-600
• Solar activity

... Main . ... April 2016 . ... December 2015 . November 2015 . October 2015 . September 2015 . August 2015 . July 2015 . June 2015 . May 2015 . April 2015 . March 2015 . February 2015 . January 2015 . December 2014 . November 2014 . October 2014 . September 2014 . August 2014 . July 2014 . June 2014 . May 2014 . April 2014 . March 2014 . ... December 2013 . ... April 2013 . ... December 2012 . ... April 2012 . ...

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Next: Long-slit spectroscopy Up: HS 0822+3542 - a Previous: Introduction . A new extremely metal-poor BCG, HS 0822+3542, was discovered on April 5, 1998, during observations with the 6m telescope of the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences (Pustilnik et al. [ 1999b ]), in the framework of the Hamburg/SAO survey for emission-line galaxies (Ugryumov et al. ... Long-slit spectroscopy . ... Reduction of long-slit spectra . ... Reduction of photometric data . ...

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• RATAN-600
• Observations
• [28.05] Chandra Observations of Cygnus X-3 During Major Radio Flaring Activity

... PUBLIC LECTURE - APRIL 12, 2016 . New Discoveries in the Outer Solar System: Ceres, Pluto and Planet X . ... Dr. Green will talk about "New Discoveries in the Outer Solar System: Ceres, Pluto, and Planet X". ... Beginning in 1992 planetary astronomers began to find Pluto like objects beyond the orbit of Neptune showing us that Pluto was a member of an entirely new family of objects we now call the Kuiper Belt. ... Amateur Astronomers Association of Princeton, Inc., ...

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