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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar cycle by helicity of magnetic fields: observations and theory. Kuzanyan Kirill 1 , Zhang Hongqi 2 , Gao Yu 2 1 IZMIRAN, Russia, 2 National Astronomical Observatories, China Using the data obtained by systematic solar vector-magnetographic observations carried out at Huairou Solar Observing Station in China within 1988-2005, we have calculated current helicity and twist of magnetic field, and so we have constructed departure from mirrorsymmetry of the solar magnetic field as a 2D function of latitude and time over the two solar cycles. These enable us to characterise the solar cycle by a new observational proxy which is not immediately related to either the magnetic field strength, nor to sunspot number. We have found that while polarity of sunspots alternates between odd/even cycles, forming the overall cycle with period of about 22 yr, the sign of helicity and twist is reproduced in each cycle the same way, so these quantities have approximately 11 yr period, although they are not immediately quadratic with respect to the magnetic field. We have found that the so-called "hemispheric rule" for helicity is obeyed over the most of the solar cycle, giving negative (positive) sign of helicity and twist in the Northern (Southern) hemisphere. We have established specific latitudes and times in the beginning and the end of each cycle when the sign of helicity and twist is systematically (based of statistically significant observations) inverted with respect to the "hemispheric rule". We have also noticed some difference between the cycles 22 and 23 in the onset of the sign inversions in Northern and Southern hemispheres which may be pronounced in the context of the long minimum of solar activity over the years 2006-2008. We are challenged to confront the found properties with existing solar dynamo models using magnetic helicity as additional constrain. Presented by: Kuzanyan, Kirill
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Space Weather Forecasting in IZMIRAN Kuznetsov Vladimir , Belov Anatoly , Gaidash Sergei Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of Russian Academy of Sciences (IZMIRAN) The Geophysical Forecast Center has been operating at IZMIRAN for 11 years. It provides the customers with the different-term daily forecast of various aspects of the space weather, such as the solar and geomagnetic activity, radiation conditions, etc. The on-line forecast is based on the bulk of data from various heliogeophysical information resources. These are the optical, X-ray and UV solar images and movies; the images and movies obtained with coronagraphs; measurements of photospheric magnetic fields and solar radio emission; helioseismic data; spacecraft and ground-based measurements of X-rays, gamma-rays, solar, and galactic cosmic rays; velocity, density, and temperature variations of interplanetary plasma; variations in three components and absolute value of the interplanetary magnetic field; and real-time ground-based measurements of geomagnetic field variations. These data, together with our previously built up databases, are used to analyze the present-day situation and tendencies in the evolution of heliogeophysical processes. Most of the space weather forecast methods created at IZMIRAN and are partly automated. Usually, the forecast issued by an automatic program is considered to be preliminary and is liable to appraisal by a group of experts. These people take a decision of whether a correction of the input data and a new cycle of automatic treatment are necessary or the forecast can be adopted as final and delivered to the users. The space weather forecast is delivered to the customer (various departments of the Russian Space Agency, Ministry of Extreme Situations, medical institutions, and mass media) using all available communication facilities: Internet, e-mail, fax. The forecast and information on the current geomagnetic situation and main meteorological parameters can be obtained via the automatic answerback phone, (unique service of the kind in the world).
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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