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The solar sphere as observed by STEREO and the Solar Dynamics Observatory on January 31, 2011. Because the STEREO separation was still slightly less than 180o at that time, a narrow gap on the far side of the Sun has been interpolated to simulate the full 360o view. The gap and quality of farside imaging will improve even more in the days and weeks ahead.
"This is a big moment in solar physics," says Vourlidas. "STEREO has revealed the sun as it really is--a sphere of hot plasma and intricately woven magnetic fields."
Each STEREO probe photographs half of the star and beams the images to Earth. Researchers combine the two views to create a sphere. These aren't just regular pictures, however. STEREO's telescopes are tuned to four wavelengths of extreme ultraviolet radiation selected to trace key aspects of solar activity such as flares, tsunamis and magnetic filaments. Nothing escapes their attention.
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An artist's concept of STEREO surrounding the sun. Credit: NASA "With data like these, we can fly around the sun to see what's happening over the horizon—without ever leaving our desks," says STEREO program scientist Lika Guhathakurta at NASA headquarters. "I expect great advances in theoretical solar physics and space weather forecasting."
Consider the following: In the past, an active sunspot could emerge on the far side of the sun completely hidden from Earth. Then, the sun's rotation could turn that region toward our planet, spitting flares and clouds of plasma, with little warning.
"Not anymore," says Bill Murtagh, a senior forecaster at NOAA's Space Weather Prediction Center in Boulder, Colorado. "Farside active regions can no longer take us by surprise. Thanks to STEREO, we know they're coming."
NOAA is already using 3D STEREO models of CMEs (billion-ton clouds of plasma ejected by the sun) to improve space weather forecasts for airlines, power companies, satellite operators, and other customers. The full sun view should improve those forecasts even more.
Vincenzo Bellini, I Puritani.
Act II, Elvira.
O Rendetemi La Speme ... Qui La Voce Sua Soave Mi Chiamava...
Vien diletto, è in ciel la luna
Dallas Symphony Orchestra,
Nicola Rescigno, Conductor.
Dallas concert rehearsal from November 20, 1957.
【2月1日 AFP】55歳以上の人が適度な運動を1年間続けたところ、記憶の形成を担う脳の海馬の容積が増え、空間記憶が改善されたとする論文が、31日の米科学アカデミー紀要（Proceedings of the National Academy of Sciences、PNAS）に発表された。
米ピッツバーグ大（University of Pittsburgh）などの研究チームは、認知症がなく座りがちの生活を送る55～80歳の男女120人を集め、「ウォーキング（有酸素運動）を1日40分、週3日行う」、「ストレッチングのみを行う」のいずれかのグループに無作為に分けた。
すると、有酸素運動をしたグループでは海馬の容積が左側は2.12％、右側は1.97％増加した。ストレッチングをしたグループでは逆に、左側が1.40％、右側が1.43％減少した。
論文を執筆した同大のカーク・エリクソン（Kirk Erickson）教授（心理学）は、「加齢に伴う海馬の萎縮は必然的なものだが、適度な運動を1年間続けるだけで海馬のサイズを大きくすることは可能だ。脳はこの段階でもまだ変わることができる」と話している。(c)AFP
