Sentences with phrase «solar cycles a period»

Dr. Pratt On decadal trending: During the last 100 years or so, solar cycle period was on average 10.54 years, while theHale cycle is twice as long.

vukcevic December 5, 2012 at 5:57 am During the last 100 years or so, solar cycle period was on average 10.54 years, while theHale cycle is twice as long.

It is possible, they say, that because of ocean and solar cycles a period of global cooling is more likely.

Back in the 1880s, Wolf calculated the solar cycle period to be 11.295 years based on the 10 cycles he had reconstructed.

Therefore, we assume that the existing proxies of the solar activity averaged over a two solar cycles period can also describe the activity of the quiet Sun.

Not exact matches

Solar eclipses occur in what's called a Saros cycle — a period that lasts about 18 years, 11 days and eight hours, and is governed by the moon's orbit.

Like hurricanes in the Atlantic, solar flares have a season: the two - to - three - year period of the solar cycle when the sun is most active.

THE SUN appears to have started its next cycle of sunspots two years ahead of schedule, heralding a period of solar magnetic storms that could trigger radio interference and auroras in the night sky.

The interval before, during and after the Comet Siding Spring encounter with Mars was one of the most disturbed periods of the current solar cycle.

For most of the space age, the sun's activity ebbed and flowed like clockwork in 11 - year cycles, with six - to eight - year lulls in activity, called solar minimum, followed by two - to three - year periods when the sun is more active.

Of course, solar irradiance measurements from just three years of one solar cycle can not be applied to any other period than the one measured by the Spectral Irradiance Monitor on NASA's Solar Radiation and Climate Experiment (SORCE) satelsolar irradiance measurements from just three years of one solar cycle can not be applied to any other period than the one measured by the Spectral Irradiance Monitor on NASA's Solar Radiation and Climate Experiment (SORCE) satelsolar cycle can not be applied to any other period than the one measured by the Spectral Irradiance Monitor on NASA's Solar Radiation and Climate Experiment (SORCE) satelSolar Radiation and Climate Experiment (SORCE) satellite.

The Sun is currently heading towards a period of minimum activity and an international team has used the full BiSON dataset to try to look for clues in previous cycles as to what might be causing some unusual solar activity observed lately.

They then infer a higher temperature sensitivity to changes in radiance over this cycle and conclude that maybe 0.1 K temperature increase would be possible due to the variation in solar radiance, or about 30 % (if you push it) of the total temperature anomaly over this period.

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

It is found that the El Niño — Southern Oscillation (ENSO) is driven not only by the seasonal heating, but also by three more external periodicities (incommensurate to the annual period) associated with the ~ 18.6 - year lunar - solar nutation of the Earth rotation axis, ~ 11 - year sunspot activity cycle and the ~ 14 - month Chandler wobble in the Earth's pole motion.

«While the earlier estimate of ± 20 % [Schulz, 2002] is consistent with a solar cycle (the 11 - year sunspot cycle varies in period by ± 14 %), a much higher precision would point more to an orbital cycle.

Strangely, it occurred in conjunction with a spate of solar activity during what is usually a quiet period in the Sun's 11 - year sunspot and storm - activity cycle.

So all else being equal, the solar cycle contribution should completely negate a CO2 - induced temperature rise of 0.2 oC per decade, during the descending period of the solar cycle (2003 - 2009 for the current cycle).

More common during the active period of the cycle known as the solar maximum, CMEs have a stronger effect than the standard solar wind.

I mean since there is no clear trend (upward or downward) in cosmic ray flux over the period we've been able to measure them directly; and since we do not see a significant difference in climate over the 11 year solar cycle between Solar Max and Solar Min (and this modulation is much larger than the one Svensmark is talking about); and since it is not clear how important the ionization from GCR is in cloud formation; and since the anthropogenic ghg mechanism does just fine reproducing the data, exactly how do you foresee implementing this «effect&rasolar cycle between Solar Max and Solar Min (and this modulation is much larger than the one Svensmark is talking about); and since it is not clear how important the ionization from GCR is in cloud formation; and since the anthropogenic ghg mechanism does just fine reproducing the data, exactly how do you foresee implementing this «effect&raSolar Max and Solar Min (and this modulation is much larger than the one Svensmark is talking about); and since it is not clear how important the ionization from GCR is in cloud formation; and since the anthropogenic ghg mechanism does just fine reproducing the data, exactly how do you foresee implementing this «effect&raSolar Min (and this modulation is much larger than the one Svensmark is talking about); and since it is not clear how important the ionization from GCR is in cloud formation; and since the anthropogenic ghg mechanism does just fine reproducing the data, exactly how do you foresee implementing this «effect»?

The longer the solar cycle the greater the cooling.The mid to late 1970s was a similar cooling period.

A period for which the SCL index is NOT «well defined», and an area many times larger than the Greenland Sea, behaving in a fashion for which we have no recent precedent according to literature — see, for instance the review article from Polyak et al, 2010 — «could» be natural since a possible relationship between sea ice and solar cycle length has been demonstrated, sort of.

Some researchers have proposed that it is the period of the meridional flow in the convective zone of the Sun that controls both the duration and strength of the Solar cycle.

The results of three separate studies seem to show that even as the current sunspot cycle swells toward the solar maximum, the sun could be heading into a more - dormant period, with activity during the next 11 - year sunspot cycle greatly reduced or even eliminated.

The article by Damon and Laut (2004) also shows that when solar cycle length is scaled up as much as it is in the above figure in order to match the 1940 - 1990 temperature record, that this implies a great mismatch for the earlier periods in time.

The solar - cloud connection is quite real (after two satellite measured sun cycles), but can't explain the rather fast and huge changes in radiation balance over the previous period.

The correlation between the two quantities is 0.85 with p < 0.01 for the whole period studied.It could therefore be concluded that both the decreasing correlation between sunspot number and geomagnetic activity, and the deviation of the global temperature long - term trend from solar activity as expressed by sunspot index are due to the increased number of high - speed streams of solar wind on the declining phase and in the minimum of sunspot cycle in the last decades.»

The following is a link to Bond's paper «Persistent Solar influence on the North Atlantic Climate during the Holocene» Bond track 22 cycles through the Holocene interglacial and into the Wisconsin glacial period.

You are confusing the 11 years sunspot (solar irradiance) cycle which does indeed have very small effect on temperature, with longer term sunspot (solar irradiance) cycles than can effect temperatures over periods more like 50 years and up to approx. 0.5 degrees maximum.

I noticed that the change in cloud cover from the minimum to maximum of the solar cycle was 2 percent, much less than the 10 % change in CO2, over the period of their study.

For GHGs + aerosols, the low - to - mid latitudes in recent decades are too cold and the 1930 - 1940 period is even cooling further... If a model isn't able to reproduce reality (i.e. not validated), it is inapropriate to make any conclusions from the results... And the researchers clearly underplayed the solar cycles in these matters.

During the period 1950 - 2000, the average length of the solar cycle is 10.7 yr (using either the sunspot numbers, or the TSI reconstruction of Lean 2000, GRL 27, 2425).

CO2 concentrations are meaningless — it's water in all it's phases reacting to variations in solar irradiance brought on by various solar cycles and orbital cycles that controls climate — PERIOD!

Within the solar cycle, solar storms such as flares and coronal mass ejections (CMEs) are most numerous within a several - year period known as the solar maximum.

Solar physicists have been looking at trends in sun - spot behavior and characteristics over the past decade and have raised the possibility that when the current sun - spot cycle peaks in the next few months, the sun could enter an unusually long period where it generates few, if any sunspots.

El Chichon and the decline of solar cycle 21 were Concomitant in this time period in addition there was a sustained la nina 84-86/87 as it seems legitimate to invoke monsters and demons it is also legitimate to invoke the almighty

But their PNAS publication also referred to natural climate cycles, superimposed on the trend line, like ENSO and solar variability, both of which have been net contributors to global cooling over 1998 - 2008 [so climate skeptics can not — as they still do — point to either the Sun or El Niño to explain the world's temperature graph over that period of time].

For forecasts of the timing and extent of the coming cooling based on the natural solar activity cycles — most importantly the millennial cycle — and using the neutron count and 10Be record as the most useful proxy for solar activity check my blogpost linked above, The most important factor in climate forecasting is where earth is in regard to the quasi - millennial natural solar activity cycle which has a period in the 960 — 1020 year range.For evidence of this cycle see Figs 5 - 9.

Periods of weak solar cycles are associated with periods of global cPeriods of weak solar cycles are associated with periods of global cperiods of global cooling.

It is still earlier than history suggests for the millennial solar cycle to be going into reverse so the current period of inactive sun may not be maintained for long but we know so little about the reasons for solar variability that predictive ability is low.

The 23 cycles of warming and cooling correlate with solar magnetic cycle changes and have a period of roughly 1500 years.

All you show is that solar cycle mean wiggles can be cherry picked to match some T means [Loehle's T are also «integrals» of T], but only for a limited period after 1200AD.

how can a Sun that has constant TSI (averaged over a solar cycle) during 1950 - 2000 play any role in the global warming that was at its strongest over that period

Certainly, but whether high or low, if the Sun is going to influence global warming then how can a Sun that has constant TSI (averaged over a solar cycle) during 1950 - 2000 play any role in the global warming that was at its strongest over that period?

You do the world a service in helping others to gain a good understanding of how the rest of the interplanetary harmonic interactions, that drive the decadal and longer period cycles, and to extend the thinking to the similarly inter-modulated Inner planet, solar, and moon harmonic period.

The Ocean oscillation period is both in a 2:3 with the Gleissberg cycle and in a 3:2 with the inner solar system return period around 44.7 years.

Strength of the Earth's magnetosphere is directly proportional to the strength of the Earth's magnetic field at any time scale from days to months years, solar cycles or Hale cycles periods, centuries, millennia..

When solar activity falls, energy comes out of the ocean, not just over the period of the decline of a single 11 year solar cycle, but if the Sun stays low in activity terms, for many years.

I agree that that does not duplicate my model because it does not deal with the millennial solar cycle which induced the MWP, LIA and current warm period.

Among others, they discovered a period of 187 years, which coincides with the known Suess / de Vries solar activity cycle.