First International Conference on MOLDAVIAN RISKS – FROM ...

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<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania SPACE CLIMATE CHARACTERIZATION OF THE HELIOSPHERE-MAGNETOSPHERE ENVIRONMENT Crisan Demetrescu, Venera Dobrica Institute of Geodynamics, Romanian Academy, Natural Fields Department Corresponding author: Crisan Demetrescu, crisan@geodin.ro Abstract: The space climate concerns the long-term change in the Sun and its effects in the heliosphere and upon the Earth, including the atmosphere and climate. Annual means of measured and reconstructed solar, heliospheric, and magnetospheric parameters are used to infer solar activity signatures at the Hale and Gleissberg cycles timescales. Available open solar flux, modulation strength, cosmic ray flux, total solar irradiance data, reconstructed back to 1700, solar wind parameters (speed and density) and the magnitude of the heliospheric magnetic field at 1 AU, reconstructed back to 1870, as well as the time series of geomagnetic activity indices (aa, IDV, IHV), going back to 1870, have been considered. Simple filtering procedures (successive 11-, 22-, and 88-year running averages and differences between them) and scaling by the standard deviation from the average value for the common interval covered by the data show that the long-discussed variation in the 20 th century (a pronounced increase since ~1900, followed by a depression in the ‘60s and a new, slower, increase) seen in the 11-year averages of parameters such as geomagnetic activity indices and reconstructed heliospheric magnetic field strength, solar wind speed, open solar flux, is a result of the superposition in data of solar activity signatures at Hale and Gleissberg cycles timescales. The Hale and Gleissberg signals were characterized and similarities and differences in the temporal behavior of the analyzed parameters at these timescales are discussed. The similarities in the studied parameters point to the common pacing source, the solar dynamo. Key words: heliosphere, magnetosphere, long-term variations, space climate. 36
<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania LONG-TERM CHANGES IN THE ROMANIAN CLIMATE Venera Dobrica, Crisan Demetrescu Institute of Geodynamics, Romanian Academy, Natural Fields Department Corresponding author: Venera Dobrica, venera@geodin.ro Abstract: It is well known that the observed changes in global climate are likely to be due to a combination of both natural and human forcings. Solar/geomagnetic variability as external natural forcing on terrestrial climate is investigated in this study, by means of long-term statistical correlations between climatic parameters and solar/geomagnetic indices at local and regional scales. For the Romanian territory a robust and reliable data set of long records of air temperature and precipitation (14 stations, 1850-2004) is available. We analyze these records in connection with long-term trends in solar and geomagnetic activities. The comparison of solar (sunspot number) and geomagnetic (aa index) parameters with the mean air temperature over the Romanian territory, at interdecadal timescales, shows positive correlation coefficients, while the comparison with the mean precipitation shows negative correlation coefficients. The correlation of climatic parameters seems to be stronger for geomagnetic activity than for solar activity. The Romanian temperature series are examined in the context of other European stations and of averages on the European, northern hemisphere, and global scale, respectively. Long-term (inter-decadal and centennial) trends and differences between local trends and average trends for larger areas are discussed. The study indicates that solar and geomagnetic activity effects are present on the 22-year Hale cycle timescale. The temperature variation on this timescale lags the solar/geomagnetic ones by 5-9 years. Key words: solar-terrestrial relationship, solar/geomagnetic activity, surface air temperature and precipitation 37
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