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Periodic Megadroughts Hit West Africa, Says Study--Global Warming Could Worsen Newly Seen Pattern（图）
Periodic Megadroughts West Africa Global Warming
2009/4/21
Researchers have developed the first year-by-year record of rainfall in sub-Saharan West Africa for the past 3,000 years, and identified a daunting pattern: a 30-to-60-year cycle of serious droughts t...
On the ionospheric perturbation associated with the 2007 Niigata Chuetsu-oki earthquake, as seen from subionospheric VLF/LF network observations
the ionospheric perturbation the 2007 Niigata Chuetsu-oki earthquake subionospheric VLF/LF network observations
2008/6/17
In order to investigate any precursory effect of ionospheric perturbations associated with the large 2007 Niigata Chuetsu-oki earthquake (16 July 2007) (magnitude, 6.8), we have made full use of our V...