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Why do we say that the Sun's activity cycle is 22 years long when the number of sunspots follows an 11-years pattern?
Wiki User
∙ 10y ago
because de internal sun dinamo es double, for do a complete cicle it need 2 "half" 11 year cicle, 11 year with one polatity, other 11 with other.
Furman Metz
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What can you conclude from your observations of sunspots?
Sunspot are never in a pattern. Sunspots move on the sun at the same speed.
What follows a cyclical pattern?
The phases of the moon, the seasons etc
What was the period of time between 1645 and 1715 called?
Maunder MinimumA period of unusually low sunspot activity taken from visual accounts of the number of sunspots observed on the solar disk. Of interest is that the sun has 11 and 22 year solar activity cycles and this period was a deviation from this frequency pattern. This 11 year variation of solar energy reaching the earth has been sited to effect a tropospheric temperature variation in the order of .5 to 1 of a degree. The Maunder Minimum of sustain low solar activity has been sited as a possible trigger for the 'Mini Ice Age' cross Europe and North America.Paraphrased from:http://www.windows.ucar.edu/tour/link=/sun/sun_climate.html
How long is the solar cycle?
Our star, the Sun, flips its magnetic N and S poles roughly once every 11 years making a complete cycle (back to the start position) a 22 year event. After the poles flip, the Sun enters a "quiet" phase during which there are very few sunspots (called a solar Minimum), while during the time the poles are flipping the number of sunspots increases (called a solar Maximum). More on the process is obtainable form the related link below.
How do sunspots effect the earth?
We suspect that sunspots do not affect global warming and there is no evidence that they do. The Maunder Minimum ( in sunspot activity ) does coincides with the middle and coldest part of the Little Ice Age ( see Wikipedia on LIA ). But we know that the solar output during sunspot active regions vs sunspot inactive times is a difference of less than one tenth of one percent. This is statistically insignificant and scientists do not consider it a cause for the Little Ice Age.Warming and cooling cycles are related to temperature variations on planets, but only in relation to the specific gas concentrations on those planets. Venus, Earth and Mars vary in many similar aspects, but not at the same time frame. This implies that the sun, which they all have in common, is not a primary factor for temperature variations.While it may be true that sunspots do not directly affect Earth's temperatures enough to account for the recent period of global warming, there is an indirect effect that some researchers have verified.Straight heat is not the only thing that the sun emits. There's a "solar wind" that is more active during periods of high sunspot activity. This solar wind "shields" (I put that in quotes because, in this case, the shielding is not such a good thing) the Earth from certain cosmic rays. These cosmic rays, when they enter our atmosphere, excite certain atmospheric molecules in such a way that they become more likely to be "seeds" for high-level cloud formation. These high-level clouds block sunlight from reaching the surface, thereby reducing temperatures. But when the sun is in a period of high sunspot activity, fewer of these cosmic rays get through, and fewer clouds form, and temperatures rise. We are in a period now of very low (zero, I believe) sunspot activity. So more cosmic rays are getting through, and more high-level clouds forming.Very little. A number of independent measurements of solar activity which is strongly related to sunspot number indicates the sun has shown a slight cooling trend since 1960, over the same period that global temperatures have been warming. Over the last 35 years of global warming, sun and climate have been moving in opposite directions. An analysis of solar trends concluded that the sun has actually contributed a slight cooling influence in recent decades.It has been speculated that solar activity could also be related to cosmic rays and subsequently to cloud cover and temperature, the same applies, and this is addressed in my previous answer. All these solar phenomena have been decreasing whilst temperature has been increasing from around 1975.The intensity of solar radiation is highly correlated with sunspot numbers since both sets of measurements began. (see link solar cycle data). I have added this clarification.Quote "It is shown that the contribution of solar variability to the temperature trend since 1987 is small and downward; the best estimate is −1.3% and the 2σ confidence level sets the uncertainty range of −0.7 to −1.9%. The result is the same if one quantifies the solar variation using galactic cosmic ray fluxes (for which the analysis can be extended back to 1953) or the most accurate total solar irradiance data composite" (Lockwood 2008).2009 and 2010 were very inactive years for the sun, yet very high temperatures were recorded the last year being a record year by many criteria. The last decade was also the warmest on record.From 1900 to the 1960s the sunspot count has been upward; from the 1960s to the present, it has diminished somewhat. The number of sunspots correlates with the intensity of solar flux since 1979, when satellite measurements became available.In Conclusion, "while the sun contributed to warming in the early 20th Century, it has had little contribution (most likely negative) in the last few decades"If you are still in any doubt, see the attached graph Temperature v Solar Activity.______________________________________________________________It should be pointed out that the IPCC claims that the science behind solar variation and it's ability to cause temperature change on our planet are still "poorly understood". This means that anyone that says they have a good grasp on the subject or they know one way or another, is wrong. We simply do not know. There has always been a connection between sunspots and temp. but the evidence in either direction is not conclusive.
Do sunspots warm up the earth?
Although solar activity is associated with sunspots, there is no associated increase in solar output. Historically sunspot activity waxed and waned on an 11 year cycle, which maps to no identifiable earthly weather pattern of matching period.
What can you conclude from your observations of sunspots?
Sunspot are never in a pattern. Sunspots move on the sun at the same speed.
What information do sunspots give scientists?
sunspots has been telling scientist about th season change and that they have a 11 year pattern
Is there a pattern that an earthquake follows earthquakes?
Nothing. There is no pattern that follows earthquakes after an earthquake.
What is a sunspot and the pattern that exists in the number of sunspots that are observed .?
Sunspots are dark, cooler spots on the sun caused by the sun's magnetic field. I believe the cycle between highs and lows of sunspot numbers is 11 years.
What is a sunspot and the pattern that exists in the number of sunspots that are observed?
A sunspot is a dark spot on the sun.The number of sunspots changes in cycles of about 11 years.sometimes there are many, and sometimes there are few.
What is the math definition of pattern?
it is a pattern that follows. eg: <> +<><>+<><><> etc.
Who follows the waether pattern?
Mr bishop
Have the dark spots on the sun remained the same for several years?
The sunspot activity cycle follows roughly an 11 year pattern of heavy to light activity; individual spots can last from days to months. Spots do not really have a uniform appearance and location and grouping also can seem somewhat random.
What is the scale that follows the WWHWWWH pattern?
major scale
What pattern does weather typically follow?
Weather really follows a day to day pattern
Which baroque form follows the pattern fast-slow-fast?
Concerto is the baroque form that follows the pattern fast-slow-fast.The baroque form concerto follows the patter fast-slow-fast.
