The Solar Constant Varies Over Time On A Regular 11 Year Interval Because Of

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At time 2 the planet has rotated 360 and the distant star is overhead again 1 2 one sidereal day.

The solar constant varies over time on a regular 11 year interval because of.

The solar constant so variation during the 21st and 22nd solar cycles kyle et al 1993. Graph by robert simmon based on data compiled by john eddy 1650 1700 and the solar influences data analysis center sidc. For the influ ence on the atmospheric energy budget time scales longer than a few days become important for climate research information over years to decades is needed. The sun s temper varies on an 11 year cycle typically taking about 5 1 2 years to move from the quieter period of solar minimum to the more turbulent solar maximum.

In 2012 an astronomical unit was defined as a specific length that being 149 597870700 million km or for practical purposes 150 million km. When going further back in time one has to rely on irradiance reconstructions using sunspots for the past 400 years or cosmogenic radionuclides for going back 10 000 years. This along with a 10 increase in the solar constant every 10 000 000 000 years can have dramatic impacts on earth s climate in regional areas such as the sea or on a global basis over time. Space based observations of solar irradiance started in 1978.

But it is not until a little later at time 3 that the sun is overhead. Calculation of elapsed time by the apparent position of the sun on a prograde planet like the earth the sidereal day is shorter than the solar day. An 11 year running average shows only the long term variation which shows a rise in total sunspot numbers from 1700 until today. These measurements show that the solar constant is not constant.

It varies with the 11 year sunspot solar cycle. Modulation of the intensity of the 11 year sunspot cycle by the 90. The solar constant is a measure of the total solar energy flux integrated across all wavelengths of radiation two decades of satellite observations reveal that the solar constant varies over time scales of days to a decade and there does appear to be a significant relationship with the sunspot number cycle. It is more difficult to prove the existence of the variation in the solar constant over a longer time interval for example with the 80 90 year gleissberg.

The sun itself is known to have a slight variability to its radiation levels over 11 year cycles of 0 2. In a january 17 2003 article email protected describes the extent of the fluctuations in solar radiation over time how. 2 an au is the mean distance from the sun to the earth over the course of a year the time it takes the planet to travel around the sun. Since then sunspot number have risen and fallen in a regular 11 year cycle.

1 the solar irradiance integrated over time is called solar irradiation solar exposure or insolation. The distance between the nucleus of the sun and the center of the mass of the solar system is not constant and varies from one cycle to the next.

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