ARLA/CLUSTER: Cientistas solares acreditam que vamos ter baixos ciclos solares, quiça mesmo um Mínimo de Maunder

[João Costa > CT1FBF]

Extended solar ebb may lie ahead

The *ARRL* report that Amateur Radio propagation guru *Carl Luetzelschwab
K9LA* says we may be seeing an extended solar ebb

Amateur Radio propagation and solar phenomena authority Carl Luetzelschwab,
K9LA, said in an April 27 webinar, “Are We Headed into Another Maunder
Minimum? What Does That Mean for Propagation?� that most solar scientists
believe several low solar cycles lie ahead, ushering in periods of
diminished HF propagation, especially on the higher bands.

Luetzelschwab, who maintains K9LA’s Amateur Radio Propagation Web Site and
pens a regular “Propagation� column for NCJ, stopped short of concluding
that we’ll experience a Maunder minimum — an extended period of very few or
no sunspots. As the Marshall Space Flight Center’s “Solar Physics� web page
explains, early sunspot records indicate that the Sun went through an
inactive period from about 1645 to 1715 — called the Maunder minimum after
the scientist who discovered it — when very few sunspots were observed.

“Right now there’s nothing bulletproof to say we’re heading into a Maunder
minimum, so we’re just going to have to wait and see,� Luetzelschwab told
the webinar, sponsored by the World Wide Radio Operators Foundation
(WWROF). “It sure looks like something inside the sun changed around the
peak of Cycle 23. There’s lots of evidence that we’re entering a grand
solar minimum. But I don’t think any of the solar scientists are 100
percent sure that we’re going to see a Maunder-type minimum.�

Read the full ARRL story at
http://www.arrl.org/news/amateur-radio-propagation-guru-says-extended-solar-ebb-may-lie-ahead

K9LA’s Amateur Radio Propagation Web Site
http://k9la.us/
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