scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Computational Analysis of Solar Radio Bursts Associated with Geoeffective X-Class Flares Veronese Thalita 1 , Rosa Reinaldo 1 , Karlický Marian 2 , Fernandes Francisco 3 , Sawant Hanumant 1 1 LAC-INPE, 2 Ondrejov Observatory, 3 UNIVAP High temporal resolution solar observations in the decimetric range (1-3 GHz) can provide additional information on solar active regions dynamics and thus to contribute to better understanding of solar geoffective solar events as flares and coronal mass ejections. The June 06, 2000 flares are a set of remarkable geoeffective eruptive phenomena observed as Solar Radio Bursts (SRB) by means of the 3 GHz radiometer at the Ondrejov Observatory. We selected and analyse, applying the Dentrended Fluctuation Analysis (DFA), three decimetric bursts associated to X1.1, X1.2 and X2.3 flare-classes, respectively. The association with the geomagnetic activity is also reported. The DFA method is performed in the framework of a radio burst automatic monitoring system. Our results may characterize the SRB evolution, computing the DFA scaling exponent, scanning the SRB time series by means of short windowing before the extreme event. For the first time, the importance of the DFA in the context of SRB monitoring analysis is presented.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Evolution of the total and spectral solar irradiance during the Holocene Vieira Luis 1 , Solanki Sami 2 , Krivova Natalie 2 1 Lab. de Physique et Chimie de l'Environnement et de l'Espace, CNRS and University of Orleans, France, 2 Max-Planck-Institut fur Sonnensystemforschung, Germany The Earth's coupled atmosphere-ocean system responds to the variability of the solar radiative energy input, which is its main external heating source. However, there is still large uncertainty on the level of changes because most of the reliable observations of geophysical and solar parameters are limited to the last decades. During this period, changes of the atmosphere's composition and of Earth's surface features due to human activity were already disturbing the thermal structure of the atmosphere. Consequently, in order to quantify the influence of solar variability on Earth's climate it is necessary to search for its influence in the time prior to the increase of human activity. Here we present a reconstruction of the total and spectral solar irradiance during the Holocene employing a simple, but consistent physical model. The model was derived from the spectral and total irradiance reconstruction (SATIRE) models employed to study the solar irradiance on time scales from days to centuries. The model uses the solar open flux, which can be computed using physics-based models from the cosmogenic isotopes recorded in natural archives, as the input parameter. The reconstruction and its implications are discussed.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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