Question: According to the readings from the satellites that measure the output of the Sun, is global warming due to the Sun's output?
About the article "Global warming", section "Solar activity".

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Since 1978, output from the Sun has been precisely measured by satellites.
These measurements indicate that the Sun's output has not increased since 1978, so the warming during the past 30 years cannot be attributed to an increase in solar energy reaching the Earth.
Climate models have been used to examine the role of the sun in recent climate change.
Models are unable to reproduce the rapid warming observed in recent decades when they only take into account variations in solar output and volcanic activity.
Models are, however, able to simulate the observed 20th century changes in temperature when they include all of the most important external forcings, including human influences and natural forcings.
Another line of evidence against the sun having caused recent climate change comes from looking at how temperatures at different levels in the Earth's atmosphere have changed.
Models and observations show that greenhouse warming results in warming of the lower atmosphere (called the troposphere) but cooling of the upper atmosphere (called the stratosphere).
Depletion of the ozone layer by chemical refrigerants has also resulted in a strong cooling effect in the stratosphere.
If the sun were responsible for observed warming, warming of both the troposphere and stratosphere would be expected.
Solar sunspot maximum occurs when the magnetic field of the sun collapses and reverse as part of its average 11 year solar cycle (22 years for complete North to North restoration).
The role of the sun in recent climate change has been looked at by climate scientists.
Since 1978, output from the Sun has been measured by satellites significantly more accurately than was previously possible from the surface.
These measurements indicate that the Sun's total solar irradiance has not increased since 1978, so the warming during the past 30 years cannot be directly attributed to an increase in total solar energy reaching the Earth (see graph above, left).
In the three decades since 1978, the combination of solar and volcanic activity probably had a slight cooling influence on the climate.
Climate models have been used to examine the role of the sun in recent climate change.
Models are unable to reproduce the rapid warming observed in recent decades when they only take into account variations in total solar irradiance and volcanic activity.
Models are, however, able to simulate the observed 20th century changes in temperature when they include all of the most important external forcings, including human influences and natural forcings.
As has already been stated, Hegerl "et al."
(2007) concluded that greenhouse gas forcing had "very likely" caused most of the observed global warming since the mid-20th century.
In making this conclusion, Hegerl "et al."
(2007) allowed for the possibility that climate models had been underestimated the effect of solar forcing.
The role of solar activity in climate change has also been calculated over longer time periods using "proxy" datasets, such as tree rings.
Models indicate that solar and volcanic forcings can explain periods of relative warmth and cold between A.D. 1000 and 1900, but human-induced forcings are needed to reproduce the late-20th century warming.
Another line of evidence against the sun having caused recent climate change comes from looking at how temperatures at different levels in the Earth's atmosphere have changed.
Models and observations (see figure above, middle) show that greenhouse gas results in warming of the lower atmosphere at the surface (called the troposphere) but cooling of the upper atmosphere (called the stratosphere).
Depletion of the ozone layer by chemical refrigerants has also resulted in a cooling effect in the stratosphere.
If the sun was responsible for observed warming, warming of the troposphere at the surface and warming at the top of the stratosphere would be expected as increase solar activity would replenish ozone and oxides of nitrogen.
The stratosphere has a reverse temperature gradient than the troposphere so as the temperature of the troposphere cools with altitude, the stratosphere rises with altitude.
Hadley cells are the mechanism by which equatorial generated ozone in the tropics (highest area of UV irradiance in the stratosphere) is moved poleward.
Global climate models suggest that climate change may widen the Hadley cells and push the jetstream northward thereby expanding the tropics region and resulting in warmer, dryer conditions in those areas overall.  
The Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report (TAR) concluded that the measured magnitude of recent solar variation is much smaller than the amplification effect due to greenhouse gases but acknowledges in the same report that there is a low level of scientific understanding with respect to solar variation.
Estimates of long-term solar irradiance changes have decreased since the TAR.
However, empirical results of detectable tropospheric changes have strengthened the evidence for solar forcing of climate change.
The most likely mechanism is considered to be some combination of direct forcing by changes in total solar irradiance, and indirect effects of ultraviolet (UV) radiation on the stratosphere.
Least certain are indirect effects induced by galactic cosmic rays.
In 2002, Lean "et al".
stated that while "There is ... growing empirical evidence for the Sun's role in climate change on multiple time scales including the 11-year cycle", "changes in terrestrial proxies of solar activity (such as the 14C and 10Be cosmogenic isotopes and the aa geomagnetic index) can occur in the absence of long-term (i.e., secular) solar irradiance changes ... because the stochastic response increases with the cycle amplitude, not because there is an actual secular irradiance change."
They conclude that because of this, "long-term climate change may appear to track the amplitude of the solar activity cycles," but that "Solar radiative forcing of climate is reduced by a factor of 5 when the background component is omitted from historical reconstructions of total solar irradiance ...
This suggests that general circulation model (GCM) simulations of twentieth century warming may overestimate the role of solar irradiance variability."
More recently, a study and review of existing literature published in Nature in September 2006 suggests that the evidence is solidly on the side of solar brightness having relatively little effect on global climate, with little likelihood of significant shifts in solar output over long periods of time.
Lockwood and Fröhlich, 2007, find that there "is considerable evidence for solar influence on the Earth's pre-industrial climate and the Sun may well have been a factor in post-industrial climate change in the first half of the last century," but that "over the past 20 years, all the trends in the Sun that could have had an influence on the Earth's climate have been in the opposite direction to that required to explain the observed rise in global mean temperatures."
In a study that brought geomagnetic activity into the discussion, as a measure of known solar-terrestrial interaction, Love et al.
found a statistically significant correlation between sunspots and geomagnetic activity, but they found no statistically significant correlation between global surface temperature and either sunspot number or geomagnetic activity.
A paper by Benestad and Schmidt concludes that "the most likely contribution from solar forcing a global warming is 7 ± 1% for the 20th century and is negligible for warming since 1980."
This paper disagrees with the conclusions of a Scafetta and West study, who claim that solar variability has a significant effect on climate forcing.
Based on correlations between specific climate and solar forcing reconstructions, they argue that a "realistic climate scenario is the one described by a large preindustrial secular variability ("e.g.
", the paleoclimate temperature reconstruction by Moberg et al.)
with the total solar irradiance experiencing low secular variability (as the one shown by Wang et al.).
Under this scenario, according to Scafetta and West, the Sun might have contributed 50% of the observed global warming since 1900.
Stott "et al."
estimate that the residual effects of the prolonged high solar activity during the last 30 years account for between 16% and 36% of warming from 1950 to 1999. 
Solar maximum or solar max is a normal period of greatest solar activity in the 11 year solar cycle of the Sun.
During solar maximum, large numbers of sunspots appear and the sun's irradiance output grows by about 0.07%.
The increased energy output of solar maxima can impact Earth's global climate and recent studies have shown some correlation with regional weather patterns.
At solar maximum, the Sun's magnetic field lines are the most distorted due to the magnetic field on the solar equator rotating at a slightly faster pace than at the solar poles.
The solar cycle takes an average of about 11 years to go from one solar maximum to the next, with duration observed varying from 9 to 14 years.
Large solar flares often occur during a maximum.
For example, the Solar storm of 1859 struck the Earth with such intensity that the northern lights could be seen as far south as Rome, approximately 42° north of the equator. 
In this article, "climate change" means a change in climate that persists over a sustained period of time.
The World Meteorological Organization defines this time period as 30 years.
Examples of climate change include increases in global surface temperature (global warming), changes in rainfall patterns, and changes in the frequency of extreme weather events.
Changes in climate may be due to natural causes, e.g., changes in the sun's output, or due to human activities, e.g., changing the composition of the atmosphere.
Any human-induced changes in climate will occur against the "background" of natural climatic variations.
Also, the term "anthropogenic forcing" refers to the influence exerted on a habitat or chemical environment by humans, as opposed to a natural process.