O minimo solar que atravessamos é um acontecimento cientifico sem paralelo por cerca de um século.<div>Os cientistas aproveitam agora, com toda a tecnologia que têm disponivel, para fazer estudos solares, nesta fase de ausencia de manchas solares, muito prolongada. Claro que com isto assim nunca mais temos propagação de jeito. Até me admira ainda se conseguir fazer QSOs em HF....Acho que a crise que afecta a população humana, é tão grande que até afectou a actividade solar.</div>
<div>Tanta calmaria na actividade solar, é no minimo inesperado, e fez falhar as mais credíveis previsões.</div><div><br></div><div>73 de CT4RK<br><div class="gmail_quote"><br><br>
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SPOTLESS SUNS: Yesterday, NASA announced that the sun has plunged into the deepest solar minimum in nearly a century. Sunspots have all but vanished and consequently the sun has become very quiet. In 2008, the sun had no spots 73% of the time, a 95-year low. In 2009, sunspots are even more scarce, with the "spotless rate" jumping to 87%. We are currently experiencing a stretch of 25 continuous days uninterrupted by sunspots--and there's no end in sight.<br>
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This is a big event, but it is not unprecedented. Similarly deep solar minima were common in the late-19th and early-20th centuries, and each time the sun recovered with a fairly robust solar maximum. That's probably what will happen in the present case, although no one can say for sure. This is the first deep solar minimum of the Space Age, and the first one we have been able to observe using modern technology. Is it like others of the past? Or does this solar minimum have its own unique characteristics that we will discover for the first time as the cycle unfolds? These questions are at the cutting edge of solar physics.<br>
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You can monitor the progress of solar minimum with a new "Spotless Days Counter" on <a href="http://spaceweather.com" target="_blank">spaceweather.com</a>. Instead of counting sunspots, we're counting no sunspots. Daily updated totals tell you how many spotless days there have been in a row, in this year, and in the entire solar cycle. Comparisons to historical benchmarks put it all in perspective. Visit <a href="http://spaceweather.com" target="_blank">http://spaceweather.com</a> for data.<br>
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100 HOURS OF ASTRONOMY: This week, astronomers are celebrating the 400th anniversary of Galileo's original telescopic exploration of the sky with "100 Hours of Astronomy," a cornerstone project of the International Year of Astronomy. Running from April 2 through April 5, many different public programs are planned worldwide. Is one of them near you? Visit the 100 Hours web site to find out: <a href="http://www.100hoursofastronomy.org/" target="_blank">http://www.100hoursofastronomy.org/</a> Note that the celebration ends on Sun Day, April 5th, a special date devoted to observations of the sun: <a href="http://solarastronomy2009.org/100-hours-sunday/" target="_blank">http://solarastronomy2009.org/100-hours-sunday/</a> .<br>
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</div><br>Best 73 from: regards from: CT4RK Carlos Mourato - Sines - Portugal<br><br> Save the Radio Spectrum! Eliminate Broadband over Power Line. Salve as frequencias de radio. Não use a rede electrica para transmitir dados. O PLC causa fortes interferencias noutro serviços sem voce se aperceber. Diga não ao PLC. Proteja o ambiente<br>
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