ARLA/CLUSTER: O minimo solar ...Um grande acontecimento cientifico

[Carlos Mourato]

O minimo solar que atravessamos é um acontecimento cientifico sem paralelo
por cerca de um século.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.
Tanta calmaria na actividade solar, é no minimo inesperado, e fez falhar as
mais credíveis previsões.

73 de CT4RK



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.

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.

You can monitor the progress of solar minimum with a new "Spotless Days
Counter" on spaceweather.com.  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
http://spaceweather.com for data.

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: http://www.100hoursofastronomy.org/  Note that
the celebration ends on Sun Day, April 5th, a special date devoted to
observations of the sun: http://solarastronomy2009.org/100-hours-sunday/ .



Best 73 from: regards from: CT4RK Carlos Mourato - Sines - Portugal

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
-----------------------------------------------------------

Este e-mail destina-se a fornecer informações de utilidade para os
destinatarios referidos, e não poderá ser considerado SPAM. Se não desejar
receber mais informações deste emissor, responda a este mail com -REMOVER-
no campo "ASSUNTO", ou bloqueando o emissor deste mail, nas suas
configurações de privacidade. Esta mensagem está de acordo com a
legislação Europeia sobre o envio de mensagens (Directiva 2000/31/CE do
Parlamento Europeu; Relatório A5-0270/2001 do Parlamento Europeu).
-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20090403/682865d9/attachment.htm