# Does the sun have cycles causing temperature changes on Earth?

Can the Sun go through seasons or cycles to cause a temperature change?

Could the Sun have to go through any kind of thermal cycle to change the climate on Earth and by how much?

The Sun's magnetic field is way too weak to have any measurable effect on the Earth's orbit. The sunspot cycle does produce a small but detectable signature in the global average temperature (about $$0.2\sideset{^{\circ}}{}{\mathrm{C}}$$). Over a billion-year timescale the Sun is getting hotter as helium builds up in its core.

• This is on the average. I would like to still know if the Sun could fluctuate in temperature when it's magnetic poles move?
– Muze
Jul 4 '19 at 18:09

The Sun is gradually increasing in brightness by 1% every hundred million years. This increase in solar output will, over the long term, cause a gradual warming of the Earth’s surface.

In roughly 1 billion years, which is long before it becomes a red giant, the combination of the Sun’s gradual increase in output and the "moist greenhouse effect" will make the Earth’s surface too hot for liquid water to exist.

For more details see my blog post The Future of humanity

• Downvote: Self-promotion. Please cite primary sources if possible. And in this case there are plenty. May 15 '19 at 16:19
• I think you are being a little harsh 'AtomsphericPrisonEscape' I agree that I wrote the orginal blost post but at the same time it answers the question well and pulls it all the information together in one place. May 15 '19 at 16:28
• On SE we do not promote answers that essentially are "Here, link", but should be self-contained on their own SE site, so that people looking for the same question in the future find coherent Q&A. This is not only a stance against self-promotion but also because websites move and are later not accessible. May 15 '19 at 17:23
• @AtmosphericPrisonEscape IMHO, the actual text of this answer is an adequate answer, the link just adds further details. Also, there's no rule against someone linking to their own off-site articles, as long as they don't hide the fact that they're the author. May 16 '19 at 4:49
• Thank you @PM2Ring I am a newbie on the site and wanted to provide a short succinct answer and a further link to my blog to provide additional information rather than write a very long answer May 16 '19 at 9:21