بسیار جالب هست که الان باید در اوج فعایت های خورشیدی باشیم ولی با کاهش فعالیت خورشیدی روبرو هستیم!
البته اگر وارد کمینه ماندر شده باشیم این فعالیت طبیعی محسوب میشه و اگر اشتباه نکنم باعث کم شدن دمای کلی کره زمین خواهد شد، مثل چیزی که در حدود 200 تا 300 سال پیش اتفاق افتاده.
اینهم توضیحات این نمودار :
It certainly seems to have been that way Lynn,
It all appears to be linked in to solar cycles. We are currently in solar cycle 24, and it has been the lowest solar cycle since the 1930′s so far. Essentially, when we see fewer sunspots on the sun, there is a notable relationship to a decrease in temperature on Earth (and particularly in the North-Western hemisphere). It was low solar cycles that we believe caused the extremely cold winters back in the 17/1800′s with two periods of very low solar cycles (known as the Dalton and Maunder minimums). The severe winters experienced in 09/10 occurred during a time when very few, and at times absolutely 0, sunspots were observed. We are now at or moving towards the maximum of the current solar cycle, and it is then expected to decline once again, but if you take a look at the image below, showing the end of the last cycle and the current cycle so far.
You can see that even the current maximum is far lower than the previous one. The fact that we are headed towards a maximum is what is causing the biggest headache at present in terms of winter – there is usually a lagged effect of increasing sunspot numbers of around 5-8 months, so the current increase in sunspot numbers may mean that this winter ends up not being as severe as the previous few have been (and the next few are likely to be) – though all of the other signs that we would look to suggest otherwise.
But moving through the rest of this decade, prepare for winters to remain much colder than during the previous 20 years
