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Large 14C excursion in 5480 BC indicates an abnormal sun in the mid-HoloceneMiyake, Fusa, Jull, A. J. Timothy, Panyushkina, Irina P., Wacker, Lukas, Salzer, Matthew, Baisan, Christopher H., Lange, Todd, Cruz, Richard, Masuda, Kimiaki, Nakamura, Toshio 31 January 2017 (has links)
Radiocarbon content in tree-rings can be an excellent proxy of the past incoming
cosmic ray intensities to the Earth. Although such past cosmic ray variations have
been studied by measurements of 14C contents in tree rings with ≧10 year time
resolution for the Holocene (1), there are few annual 14C data. There is a little
understanding about annual 14C variations in the past with the exception of a few
periods including the AD774-775 annual 14C excursion (2).
Here, we report the result of 14C measurements using the bristlecone pine tree rings
for the period from 5490 BC to 5411 BC with 1-2 year resolution, and a finding of an
extraordinarily large 14C increase (20‰) from 5481 BC to 5471 BC (the 5480 BC
event). The 14C increase rate of this event is much larger than that of the normal
Grand Solar Minima. We propose the possible causes of this event are a special
phase of grand solar minimum, or a combination of successive solar proton events
and a normal grand solar minimum.
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炭素14と宇宙線変動 : 奈良時代の異変Nakamura, Toshio, Nagaya, Kentarou, Miyake, Fusa, Masuda, Kimiaki, 中村, 俊夫, 永冶, 健太朗, 三宅, 芙沙, 増田, 公明 03 1900 (has links)
名古屋大学年代測定総合研究センターシンポジウム報告
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Análise do campo elétrico atmosférico durante tempo bom e distúrbios geofísicosAnaya, José Carlos Tacza 19 January 2015 (has links)
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Previous issue date: 2015-01-19 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / In this dissertation, we present the capability of a new network of sensors to monitor the atmospheric electric field at various locations in South America. The main goal is to obtain the characteristic Universal Time daily curve of the atmospheric electric field in fair-weather. That curve is known as the Carnegie curve, which is related to the currents flowing in the Global Atmospheric Electric Circuit. This has been accomplished using monthly, seasonal and annual averages. After obtaining our standard curve of variation of the electric field in fair-weather, the deviations related to phenomena such as solar flares, solar protons events, geomagnetic storms, total solar eclipse and seismic activity are analyzed and commented. / Neste trabalho de dissertação apresenta-se a capabilidade de uma nova rede de sensores para monitorar o campo elétrico atmosférico em vários locais na América do Sul. O objetivo principal é obter a curva diária do campo elétrico atmosférico de tempo bom. Para isto foram realizadas médias mensais, sazonais e anuais. Essa curva é comparada com a curva característica em Tempo Universal conhecida como a Curva de Carnegie, a qual é relacionada com as correntes fluindo no Circuito Elétrico Atmosférico Global. Depois de obter a curva padrão de variação do campo elétrico atmosférico de tempo bom, foram analisados e comentados os desvios relacionados a explosões solares, eventos de prótons solares, tempestades geomagnéticas, eclipse solar e atividade sísmica.
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