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Post by georgiadexter on Aug 23, 2011 18:12:59 GMT
Hi all,
Have just joined forum, and been a keen solar activity follower for the last 8 years.Not as technically astute as some of you but a real fan of solarcycle24 great work on the website.
Coming to my own solar activity conclusions but would like some help or input.
Please could someone from a professional background clarify if the sun light/output strength has decreased significantly in the last 3 years? I have a collegue in Qatar confirming the last 2 years sun/heat being felt there is at least 2/3 degrees cooler.If there is a dramatic decreasing output it is fascinating all the cooler wetter windier weather being reported globally.New Zealand having a very harsh winter 2011 and the Uk too.
Please post your thoughts many thanks.
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Post by lsvalgaard on Aug 23, 2011 18:17:57 GMT
Hi all, Have just joined forum, and been a keen solar activity follower for the last 8 years.Not as technically astute as some of you but a real fan of solarcycle24 great work on the website. Coming to my own solar activity conclusions but would like some help or input. Please could someone from a professional background clarify if the sun light/output strength has decreased significantly in the last 3 years? I have a collegue in Qatar confirming the last 2 years sun/heat being felt there is at least 2/3 degrees cooler.If there is a dramatic decreasing output it is fascinating all the cooler wetter windier weather being reported globally.New Zealand having a very harsh winter 2011 and the Uk too. Please post your thoughts many thanks. The solar output has increased the last three years as expected as we are now nearing solar activity maximum. The changes are very small, though, only one part in a thousand. |
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Post by lsvalgaard on Aug 24, 2011 1:21:46 GMT
Thanks for the reply. I understand we are in a solar maximum but it is very calm quiet maximum.Could you confirm wether we are receiving less light/heat on earth during this time.The light we receive now compared with 9 years ago feels like a White chromatin filter effect. Do you know why this is or am I imagining it? We are receiving a tiny bit less, but not something you can feel or see. |
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Post by andrewuwe on Aug 30, 2011 12:51:27 GMT
By "we" you mean the Earth including atmosphere.
The radiation reaching the Earth's surface may be different? So maybe you would see or feel it. Example: solar minimum was claimed to affect European weather recently...http://news.bbc.co.uk/1/hi/8615789.stm
Is the white chromatic filter the same as the so called "Top Gear Filter"?
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Post by dontgetoutmuch on Aug 30, 2011 21:18:28 GMT
The most accurate value of total solar irradiance during the 2008 solar minimum period is 1360.8 ± 0.5 Wm ^2 according to measurements from the Total Irradiance Monitor (TIM) on NASA's Solar Radiation and Climate Experiment (SORCE).
This value is slightly lower than 1365.4 ± 1.3 Wm ^2 established in the 1990s
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Post by georgiadexter on Sept 1, 2011 21:26:07 GMT
Hi many thanks for helping to answer my question. As said above I have been watching the statistics for a while please could someone knowledge able let me know if the solar wind drops this low often.I have tried the ace website for historical graphs and this current reading looks very low?
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Post by lsvalgaard on Sept 2, 2011 1:27:13 GMT
The most accurate value of total solar irradiance during the 2008 solar minimum period is 1360.8 ± 0.5 Wm ^2 according to measurements from the Total Irradiance Monitor (TIM) on NASA's Solar Radiation and Climate Experiment (SORCE). This value is slightly lower than 1365.4 ± 1.3 Wm ^2 established in the 1990s It is lower because of different calibration, not because the Sun is weaker. |
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Post by sigurdur on Sept 2, 2011 1:32:17 GMT
Dr. Svalgaard:
When did the calibration get changed? Is this reflected in historical data as well?
As an example, I am thinking of the step change in sea temps when ARGO data was started. Should we look for something similiar in the TSI values?
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Post by georgiadexter on Nov 25, 2012 14:15:17 GMT
Hi please is the coronal line/hole normally fully across the complete lower part of the sun?
Like it is now on the latest solar [SDO] AIA 171 image.
Thanks
I am still looking at the latest solar image and the above seems to be more prominent than ever. Anyone with professional stand in this field have I a credible remark/observation?
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Post by walnut on Apr 11, 2013 0:56:29 GMT
The human eye cannot perceive a decrease of 1/1000 I am sure, but years ago during the last minimum I told my wife "the daylight has been looking paler to me, like pastels". I called it "global dimming" and really thought I had invented a new idea haha I didn't know anything about solar cycles then, but since have studied for many months, but still know very little I guess.
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Post by lsvalgaard on Apr 12, 2013 0:32:59 GMT
The most accurate value of total solar irradiance during the 2008 solar minimum period is 1360.8 ± 0.5 Wm ^2 according to measurements from the Total Irradiance Monitor (TIM) on NASA's Solar Radiation and Climate Experiment (SORCE). This value is slightly lower than 1365.4 ± 1.3 Wm ^2 established in the 1990s That difference is an artifact caused by construction flaws in earlier instruments. |
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Post by cuttydyer on Apr 18, 2013 13:47:15 GMT
The human eye cannot perceive a decrease of 1/1000 I am sure, but years ago during the last minimum I told my wife "the daylight has been looking paler to me, like pastels". I called it "global dimming" and really thought I had invented a new idea haha I didn't know anything about solar cycles then, but since have studied for many months, but still know very little I guess. Walnut, Your comment reminded me of a George Clausen painting completed in 1881. This work was painted at the end of a period of very low solar activity.  |
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Post by karlox on Apr 29, 2013 7:16:44 GMT
The human eye cannot perceive a decrease of 1/1000 I am sure, but years ago during the last minimum I told my wife "the daylight has been looking paler to me, like pastels". I called it "global dimming" and really thought I had invented a new idea haha I didn't know anything about solar cycles then, but since have studied for many months, but still know very little I guess. My opinion is that what our eyes and brain can perceive is a different "quality" of light due to variables such as dust and relative humidity. It´s clear that we are experiencing a new climate-shift starting around 2000; THAT can be perceived by a layman´s point of view if either more or less humid atmosphere prevails during most times most years... Whether that climate-weather shift is being driven by natural cycles not well understood yet or mandriven to some extend etc. is main topic of discussion on this forum. Better understanding of Sun´s variables and cycles effect on earth´s climate trends and climate events in the past and future should be one of mains scientific targets for this decade. Yes, I think many of us detected a change of light-quality, but due to different weather patterns building up... |
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Post by georgiadexter on Jul 28, 2014 11:30:08 GMT
Hi Dr svalgaard
Thank you for answering my previous posts.
Since my last posts I have been monitoring two daily various outputs from the sun and graphing and still coming to my same conclusion as per 2011.
I am certain that the light and heat and uv to an extent from the sun has dropped substantially from 2001. Whats really interesting is that this year and last the Antartica sea ice are at record highs.
Beating ice extent not by a few 1000 miles but by the increase of Greenland! I know that this is not a climate change post but considering the sun is our only heat source I find that growth staggering.
Being in the scientific community do you know why this is being suppressed so much?
Thank you very much for your time on these posts as I find your answers invaluable when collating my data.
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Post by greyviper on Feb 17, 2015 1:15:27 GMT
what do you use to monitor the sunspots? do you employ visible telescopes?
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