John Larkin wrote:
> On Mon, 30 Jan 2012 15:50:47 -0800 (PST), Bill Sloman
> <(E-Mail Removed)> wrote:
>
>> On Jan 30, 6:09 pm, John Larkin
>> <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>>> On Mon, 30 Jan 2012 11:39:26 -0500, "Tom Del Rosso"
>>>
>>> <td...@verizon.net.invalid> wrote:
>>>
>>>> John Larkin wrote:
>>>>> Maybe the apparent AGW was itself just a cyclic variation.
>>>>> But the sunspot thing looks serious.
>>>>> http://en.wikipedia.org/wiki/File:Sunspot_Numbers.png
>>>>> The sunspot minima correspond to low temperatures.
>>>>> The "modern maximum" started about 1900.
>>>> One of the early episodes of Nova in the 1970's was all about sunspots.
>>>> Aparently they also correspond to hemlines and Beatlemania.
>>> Since the sun warms the earth, and sunspots indicate something serious
>>> going on with the sun, there's a chance the sunspot-temperature thing
>>> is actually causal.
>> Sunspots are entirely superficial - confined to the outermost layers
>> of the sun,
>
> And how do you know that?
>
> http://en.wikipedia.org/wiki/Sunspot#Physics
>
> "Although the details of sunspot generation are still a matter of
> research, it appears that sunspots are the visible counterparts of
> magnetic flux tubes in the Sun's convective zone that get "wound up"
> by differential rotation. If the stress on the tubes reaches a certain
> limit, they curl up like a rubber band and puncture the Sun's surface.
> Convection is inhibited at the puncture points; the energy flux from
> the Sun's interior decreases; and with it surface temperature."
It takes around a hundred thousand years for a photon from a nuclear
reaction at the centre of the sun to make it to the surface. Effectively
a diffusion style random walk in a highly scattering plasma medium.
Sunspots merely tweak the effective transport properties of the
relatively shallow uppermost surface layer slightly.
>
> Idiot.
Although it is true that the *sunspots* are cooler than the main
photosphere there is one crucial point you are missing. The sun on
average is mostly *brighter* when there are lots sunspots visible as the
lost output from the spots themselves is more than compensated for by
the much larger areas of bright faculae that accompany them. An active
sun is a brighter sun this is not in dispute and is included in all the
climate models. The effect of the sunspot cycle variation in TSI of 0.1%
on the global climate is however right at the limits of detection.
You cannot blame the sun for all the recent warming - the satellite data
rules out magically making the sun brighter.
Regards,
Martin Brown