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Lassen & Friis Christensen

Why exactly do we have such a long section on this? Earlier it might have been needed since this was an important conflict. But at this point in time, the conflict has been resolved, and while the correlation might have seemed interesting then, it turned out to be a case of correlation != causation. --Kim D. Petersen (talk) 22:36, 1 February 2012 (UTC)

There is a lot of brokeness. We also have (start with!) "Variations in total solar irradiance (TSI) were found to be the most likely cause of significant climate change prior to the industrial era by a U.S. National Academy of Sciences study, and in 1997, astronomer Sallie Baliunas suggested that changes in the sun "can account for major climate changes on Earth for the past 300 years, including part of the recent surge of global warming."" (and the NAS study is from 1994). SB shouldn't be there, and we should find a more recent ref than NAS. The whole lot needs going over William M. Connolley (talk) 11:21, 2 February 2012 (UTC)

The Baliunas citation references a quote in a Harvard newspaper. It does relate to how people were thinking as of 1997, but it's right on the edge of what is citeable, and probably the wrong edge. If he said the same thing (with actual numbers) in some more referenceable place, we should cite that, otherwise, makes sense to dump it.

I haven't dug up and read the 1994 NAS study. Reports by the National Academy of Sciences are the gold standard of a reliable source, though, so I can't see cutting it.

I agree that the Friis-Christensen & Lassen paper seems to be now considered at best a coincidental correlation. At the moment the article has three sentences explaining what the paper says, and six sentences explaining why it's wrong. If you think this is too much, I don't see that we can shorten the discussion of the paper itself by very much. The paper appeared in Science, a reputable source, and (as mentioned in the article), is a paper that is referenced a lot; so shortening this section would mean that you want to cut back on the text explaining why the paper is wrong.

The text does seem to be out of place in the location it's in, though; it does not relate to the earlier or later section. It would be better organized if we added a new sub-heading for "correlations with length of solar cycle" for this particular material. Geoffrey.landis (talk) 14:52, 2 February 2012 (UTC)

--OK, I deleted the marginally-notable Baliunas quote, and put the discussion of the Friis-Christensen & Lassen paper discussion in its own subsection. I think it reads better now. Geoffrey.landis (talk) 15:17, 2 February 2012 (UTC)

Clouds and galactic cosmic rays

Just to explain my edit: The previous version of the article had the discussion of clouds and cosmic rays split in three places, without (as far as I can see) an organizational reason for which material was in which place. This revision put the material relating to how cosmic rays and solar activity affect cloud in the "effects on clouds" subsection of "Solar interactions with Earth"; and put the material discussing the effect, and how much cloudiness is produced, in the "Weather" subsection of "Solar Variation and Climate." (I also left the CERN material there-- it seemed to fit the logical flow-- but added a citation in the earlier section.) I did some minor clean-up while moving, but don't think I made any changes to the material, nor added or deleted any references, just repositioned them. Geoffrey.landis (talk) 21:46, 3 February 2012 (UTC)

Clouds and cosmic rays sounds like a good article title. Is there any scientific research hypothesizing a causal link between them? --Uncle Ed (talk) 02:13, 8 February 2012 (UTC)

Yes, there's a number of papers hypothesizing ways that there could be a causal link. Check the citations in the "Effects on Clouds" subsection (references 47-50 and 82, 87, and 88 in the current version of the article). At the moment, whether the effect is large enough to be noticeable in the real world is still unclear. Geoffrey.landis (talk) 14:44, 8 February 2012 (UTC)

Most of the content regarding Clouds and cosmic rays is spread out over Misplaced Pages. The theory was originally proposed I think in 1959 and has been well documented. Some knowledge concentrated in cosmic rays and CLOUD. 174.49.84.214 (talk) 19:44, 9 February 2012 (UTC)

Geoffrey, note that your link to Galactic Cosmic Rays leads to a different page from just Cosmic Rays.174.49.84.214 (talk) 20:08, 9 February 2012 (UTC)

Activity and variation

Are there any actual astronomers here? Solar activity is not the same as solar variation. What is the appropriate term for significant things that the sun does? The most significant things I know about are:

1. sunspots and sunspot number - these vary a lot, on an 11-year (or 22-year) cycle
2. solar wind - this changes in lockstep with the sunspots, right?
3. solar radiation (i.e., "sunlight" ) - this varies vary little (hence the concept of a "solar constant")

What's the term for changes in solar activity, especially cyclic changes? Right now solar activity => solar variation but that makes no sense. I tried making "Solar variability" as a disambig page, but is that really the solution? --Uncle Ed (talk) 23:28, 3 February 2012 (UTC)

Hi Ed. Strictly speaking, "solar activity" is "what's going on", and "solar variation" is "how much is what's going on changing"? However, the two are so closely coupled that the terms are effectively used to describe the same thing. The solar constant isn't a constant. It does indeed change with solar activity, but only fairly little (which is why it only has a minor effect on global warming, which is why deniers often make solar variation seem to be BIGGER so they can pretend "it's not CO2"). If you check the very first image in the article, you can see that the red line (yearly variations in "the solar constant") very closely matches the direct indicators of solar activity. You can also see that the change over time is small - about 1 W/m, or somewhat less than 0.1%. This is not measurable with pre-modern instruments, and it is much less than the ~3.5% yearly variation that we see due to the eccentricity of the earth's orbit. That's why the solar constant is called "constant", although it really is not. See etymological fallacy.  ;-) --Stephan Schulz (talk) 10:32, 4 February 2012 (UTC)

Thanks for your courteous and detailed response. I wonder, though, if both of us are using words the same way.

I have been thinking that "changes in solar activity" includes both (1) the fairly little changes in the solar constant and (2) changes in sunspots. Note that I have turned Solar activity into a disambig page.

The part I think is clear is that Solar radiation reaching the Earth (as irradiance) varies only fairly little. The part that's not clear is that changes in sunspots affect the solar wind, which in turn affects the amount of cosmic rays which enter the earth's atmosphere.

Some "deniers" are concerned with irradiance, but others are concerned with cosmic rays. Is there a term for changes in solar activity which comprises both solar radiation changes and solar wind changes? Or does "solar variation" refer only to the former? --Uncle Ed (talk) 16:06, 4 February 2012 (UTC)

I don't think it's just "deniers" who are concerned with irradiance and cosmic rays. Very serious scientists are engaged in very material scientific endeavors related to the solar irradiance variation and cosmic ray variation. I would say that solar variation deals with variation in the solar output and also with other variations with the sun like variations in the sun's magnetic field & solar wind which in turn has an effect on cosmic rays hitting the earth. So in the climate section of this page, heaven help me for saying this, we should note that variations in the solar magnetic field & solar wind may cause an impact to cosmic rays hitting the earth. However, I stand by my assertion that this page should be mostly about solar variation (the actual physical changes to the sun) and that the terrestrial climate topic and climate change and other impacts of the sun on the earth should be handled in their respective pages with only summaries here.174.49.84.214 (talk) 20:34, 9 February 2012 (UTC)

Ed, here is some more thinking on things that vary:

1. sunspots and sunspot number - these vary a lot, on an 11-year (or 22-year) cycle
2. solar wind - this changes in lockstep with the sunspots, right?
3. solar radiation (i.e., "sunlight" ) - this varies vary little (hence the concept of a "solar constant")
4. Sun's Magnetic Field Strength - varies with the sunspot cycle and with the conveyor belt cycle
5. Sun's Magnetic Field Pole - It flips from time to time
6. Sun's Great Conveyor Belt - varies in speed over time and we think has a longer term impact on the sun
7. CME's - vary depending on a whole bunch of variables

Then beyond that, we have longer term solar variations like the fact that the sun is slowly getting hotter as it progresses along the main sequence. This page though seems to not be focused on that. It appears largely to have been built to promote or detract from AGW theory. I would like it to be more about our Sun's Variations but I'm outvoted largely. I'd engage Geoffrey Landis. He edits here and while his time is limited he is a Physicist from NASA who knows his stuff and is very balanced. 174.49.84.214 (talk) 15:06, 10 February 2012 (UTC)

Abbot's solar variation tool

Hi everyone! I just uploaded an image of Charles Greeley Abbot utilizing a tool which, I believe, he uses to "read" solar variation. Perhaps it will be of some use for this article! You can find the image here. -- Sarah (talk) 19:21, 11 April 2012 (UTC)

What fun. Certainly gives historical perspective. CarolMooreDC 20:54, 11 April 2012 (UTC)

I had a look, but I'm not sure what the picture is of. Guessing, I'd say it was some kind of mechanical fourier-analysis device William M. Connolley (talk) 21:16, 11 April 2012 (UTC)

new review paper

This is a sort of todo note for me or anyone else that has more time than me. A new review article came out this morning on Solar Irradiance Variation and climate. It seems to be pretty well written and could definitely be used to improve that section of this article. Sailsbystars (talk) 15:19, 13 June 2013 (UTC)

TSI

There is an inconsistency between the presented TSI graph, the graph of sunspot numbers and data available from NASA SORCE. I am looking at http://lasp.colorado.edu/home/sorce/data/tsi-data/#historical and find

http://lasp.colorado.edu/data/sorce/total_solar_irradiance_plots/images/tim_tsi_reconstruction.jpg

which is not consistent with what is presented on this encyclopedia page.

66.127.213.130 (talk) 19:33, 7 October 2013 (UTC)dogsinlove

Which of our graphs are you talking about? File:Carbon14-sunspot-1000px.png? In what way are the two graphs inconsistent? William M. Connolley (talk) 19:57, 7 October 2013 (UTC)

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