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Stephen Roy

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About Stephen Roy

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  1. Echoing what Sparkatronn has written: "One interesting aspect of solar cycles is that the sun went through a period of near zero sunspot activity from about 1645 to 1715. This period of sunspot minima is called the Maunder Minimum. The "Little Ice Age" occurred over parts of Earth during the Maunder Minimum. So how much does the solar output affect Earth's climate? There is debate within the scientific community how much solar activity can, or does affect Earth's climate. There is research which shows evidence that Earth's climate is sensitive to very weak changes in the Sun's energy output over time frames of 10s and 100s of years. Times of maximum sunspot activity are associated with a very slight increase in the energy output from the sun. Ultraviolet radiation increases dramatically during high sunspot activity, which can have a large effect on the Earth's atmosphere. The converse is true during minimum sunspot activity." Source: https://www.weather.gov/fsd/sunspots This 'rhymes' with the events experienced in the middle of the Wolf Minimum.
  2. During the Wolf Minimum in the C14th, records show there was a world wide Panzootic and a decimation of domestic, cattle sheep and oxen from China to Iceland. Prolonged heavy rainfall in Europe 1314 - 1317 added to human suffering as it contributed to the failure of agriculture and led to widespread famine. As I posted in an earlier thread Solar activity appears to be closely aligned with radio carbon measurements. 1314- 1317 also appears to be right in the middle of the Wolf Minimum. I'm not a scientist so don't have the skills to correlate or analyse the data further. However, I can offer these two observation: Half of the very substantial herd of the Pigs in China have had to be culled over the past few months because of disease. Rainfall across the UK has been extremely heavy for the past 7 or 8 months. The Association representing Farmers in the UK have recently voiced concerns that if this deluge continues it will affect spring planting and the subsequent harvest later in the year. If the heavy rainfall continues we may be in a similar position to that experienced in 1314-1317? Although not a published peer review paper an MA Dissertation by Timothy P Newfield: "A cattle panzootic in early fourteenth-century Europe" (available as a PDF download) makes for interesting reading.
  3. @3gMike. Thank you for your contribution. I was aware of the problem post 1945 with Radiocarbon measurements due to the testing and deployment of nuclear weapons. However, I don't have a background in physics so would appreciate help from someone who does to add radiocarbon data post 1900 in the plot against solar activity post 1900. My thanks once again. Stephen
  4. May I take this opportunity to thank you all for responding to my question. However, it seems that it remains unanswered: " Chart showing solar activity recorded by Radiocarbon covering the period from 900 to 1900. [The chart is reproduced here: https://en.wikipedia.org/wiki/Solar_cycle#Cycle_history ]. Unfortunately the plot stops at 1900. Does anyone have access to the data post 1900 and the skills to continue the plot? I am keen to know whether it will follow a similar pattern as the one from the Medieval Maximum to the Wolf Minimum (1280 - 1350).
  5. There is a very interesting chart showing solar activity recorded by Radiocarbon covering the period from 900 to 1900. [The chart is reproduced here: https://en.wikipedia.org/wiki/Solar_cycle#Cycle_history ]. Unfortunately the plot stops at 1900. Does anyone have access to the data post 1900 and the skills to continue the plot? I am keen to know whether it will follow a similar pattern as the one from the Medieval Maximum to the Wolf Minimum (1280 - 1350). In Europe in 1315, slap bang in the middle of the Wolf minimum, manorial and monastic records show that a panzootic killed a large number of sheep and cattle. This coincided with heavy precipitation across Europe from 1314-1317 leading to grain shortages and famine. For the past 5 months in Britain in my locality monthly rainfall has been over 200% of the historical monthly average (Source: weather.com Almanac). February's rainfall so far is almost 500% of the historical monthly average (21/02/20). Interestingly according to the Telegraph Newspaper "Britain is being deluged by “atmospheric rivers” delivered on the jet stream, the Met Office has said.Experts believe the west-east band of high-altitude winds is currently pointed directly at the UK for the first time in years, enabling a “conveyor belt” of non-stop rain. Last night meteorologists warned the UK is likely to face increasingly severe flooding as a result of atmospheric rivers in the future as climate change takes hold...."
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