太陽活動の低下、地球への影響は?


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[December 2 AFP] Such a quiet state continues and the number of the latest solar surface of sunspots has become less than any time in the 20th century that he is surprised.
The scientists who excited interest in this phenomenon are surrounding with the thought what it means on this earth.
It fluctuates in accordance with the solar cycle in a cycle of about 11 years, after increasing suddenly in one day, activity becomes weaker rapidly, and the number of ? sunspots becomes active after that again.
■ The observation lowest ever level
Since the present cycle called “the cycle 24 (the 24th solar cycle)” is too much inactive although it is ?, scientists have been surprised.
The total of the sunspot which had appeared so far after the cycle 24 started in 2008 is much less than the average value observed in the past 250 years, and actually less also than a half.
The physicist of the U.S. National Oceanic and Atmospheric Administration (National Oceanic and Atmospheric Administration, NOAA) and Mr. Doug Biesecker say, “This is a cycle of the maximum weakness in space age 50 years.”
The intense electromagnetic energy emitted from ? sunspot has the serious influence for ultraviolet irradiance and X ray radiation of the sun, solar disturbance, etc.
? solar disturbance has a possibility of intercepting the communications network and electronic network on the earth.
Moreover, a sunspot activity may also affect the climate of the earth.
“The cycle 23” reached the “maximum” around 2000, and after that, activity of the cycle became weaker gradually and became the “minimum” 2008.
Scientists appeared and considered this time as the beginning of a cycle.
Although astronomers predicted that the cycle 24 became dull because the solar activity became the minimum in the end of the cycle 23, reality further fell short of anticipation.
Although the solar activity must have gone up [ of the ? cycle 24 ] in the first year, the day when one piece does not appear [ a sunspot ], either was observed in total as long as 266 days.
As “the maximum of sunspot appearance prediction was 90 pieces”, Mr. ?Biesecker has indicated “That which is twisted that 90 pieces are likely to be approached is very clear”, although activity has gone up in one year.
As for the number of the said persons, the number of “sunspots was a maximum of 67 last year again.
It was added that it was less also than the half of the usual cycle.”
That the cycle of the sunspot became that dull before ?, the number of appearances per day was only 64 pieces in the time of the “cycle 14” maximum in February, 1906.
■ Reversal of solar magnetism
The one more ? cycle 24 is a surprising point, and it has separated from it from the standard.
The character of the magnetic field in the North Pole and the South Pole usually reverses ? solar magnetism simultaneously in the hit of the last in a cycle of 11 years each, and polarity changes.
Scientists explain that the intensity of a magnetic field will become high again if it falls to near the zero and polarity becomes reverse while polarity reversals have occurred.
It seems that differing from this this time although it is ? has broken out.
At the North Pole, polarity is already reversed several months ago, and it has become the same polarity as the South Pole now.
According to observation by the ? latest artificial satellite, it is the Todd hoe クセマ of the U.S. Stanford University (Stanford University) Wilcox solar observatory (Wilcox Solar Observatory), saying “The Southern Hemisphere should be reversed in the near future” (Todd Hoeksema) him — it says.
Although it seems that ? said person is not worried about this phenomenon, scientists are observing the sun carefully, in order that the fall of the solar activity of the present [ be / it / that the cycle 24 becomes an “unusual” cycle ] may discern whether it is that also until is prolonged in the following cycle.
Mr. Biesecker says, “By the time it becomes clear, ゆう will still take 3 or 4 year surely.”
■ Influence of the climate on the earth?
The researcher who surmises that it may be beginning of the solar activity fall term over a long period of time is also in ? and this.
A sunspot was hardly observed at what is called “the Mounder’s minimum (Maunder Minimum)” of the between in the first half of the 18th century around from the middle of the 17th century the phenomenon of the appearance occurred last time [ ? ].
On this time and the earth, temperature fell rapidly and what is called a small glacial epoch (Little Ice Age) occurred in Europe and North America.
If a situation with few ? sunspots further continues, a possibility that the climate of the earth will be affected again will come out.
Although it is ?, thanks to global warming, probably, a possibility of being hit again at a glacial epoch will be low.
“The situation has not gone to cooling yet.
Mr. Biesecker has stated [ that it is not only going up so promptly (the number of sunspots)”, and ].
(c)AFP/Jean-Louis SANTINI




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