Archive

Archive for the ‘solar’ Category

An 11 year solar signal in the atmosphere

June 27, 2014 9 comments

A 10 year old paper in JGR unearthed a slight solar effect in the atmosphere and whilst the paper is mentioned in various blog comments around the netnote, a quick search suggests it hasn’t had direct exposure. No harm done if it has.

Image

Subset of Figure 4 from the paper, y-axis is atmospheric pressure hPa. Above is a hovmoller diagram.

Read more…

Advertisements
Categories: analysis, entropy, solar

A non-linear solar cycle exploration

August 24, 2013 1 comment

Preamble, do not take this work too literally. the intent is food for thought.

Image

Figure 1

Recent very long free thinking discussion (paged comments) on Tallbloke’s Talkshop evolved into trying to create a model of astronomical effect on the sun of planetary parameters, a longstanding tantalising problem where “ought to” and reality throw buns. Probably fits the tales of the farmer of old leaning on the farm gate chewing straw watching fools trying to get the cart under the bridge. Won’t fit but watching is fun. Lets hope that one day more is learnt.

Read more…

Categories: analysis, solar

Spectral irradiance phasing, TSI does not fit common assumptions, earth is affected

August 13, 2013 2 comments

Image

Figure 1 from paper, for extensive caption see paper or copied below.

Recent variability of the solar spectral irradiance and its impact on climate modelling

I. Ermolli1, K. Matthes2, T. Dudok de Wit3, N. A. Krivova4, K. Tourpali5, M. Weber6, Y. C. Unruh7, L. Gray8, U. Langematz9, P. Pilewskie10, E. Rozanov11,12, W. Schmutz11, A. Shapiro11, S. K. Solanki 4,13, and T. N. Woods10

  1. INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
  2. GEOMAR I Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany
  3. LPC2E, CNRS and University of Orléans, Orléans, France
  4. Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany
  5. Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece
  6. Institut für Umweltphysik, Universität Bremen FB1, Bremen, Germany
  7. Astrophysics Group, Blackett Laboratory, Imperial College London, SW7 2AZ, UK
  8. Centre for Atmospheric Sciences, Dept. of Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK
  9. Institut für Meteorologie, Freie Universität Berlin, Berlin, Germany
  10. University of Colorado, Laboratory for Atmospheric and Space Physics, Boulder, CO, USA
  11. Physikalisch-Meteorologisches Observatorium, World Radiation Center, Davos Dorf, Switzerland
  12. IAC ETH, Zurich, Switzerland
  13. School of Space Research, Kyung Hee University, Yongin, Gyeonggi 46-701, Republic of Korea

Read more…

Categories: solar

Stratospheric ozone, Dobson history at Oxford

July 13, 2013 4 comments

Image

Over at Tallbloke’s the subject has got around to the stratosphere, including a post by Rog reporting on a lecture he attended at Leeds Uni. given by Susan Solomon.
Link here.

Seems apt to cover Dobson as a backgrounder.

As it happens I’ve been moving in the same direction as part of unravelling atmospheric matters. Image right is a thumbnail of an old page at Oxford Uni. Physics department which gives a potted history of G.M.B Dobson, a local physicist who made a life’s work of measurement of high atmosphere ozone. The measurement unit the Dobson is in his honour. Even more remarkably his photoelectric spectrophotometer is the standard instrument today, used around the world.

Click image or link

For example, World Meteorological Organisation “Operations Handbook – Ozone Observations with a Dobson Spectrophotometer. https://www.wmo.int/pages/prog/arep/gaw/documents/GAW183-Dobson-WEB.pdf and much more is available.

Read more…

Categories: History, solar

Provisional look at solar constant 1923 to 1954

June 28, 2013 Leave a comment

Image

Figure 1, daily data. Note [1]

The solar constant has long been of interest to science, with good measurements in existence for over a century. Today and measured from satellite this is known as TSI (Total Solar Irradiance), but presumably there will be a slight difference between space based measurements and terrestrial measurements caused by irradiance wavelengths which are totally blocked by the atmosphere and cannot be deduced. Far UV probably being an instance. However this might be of little importance since parasitic irradiance from eg. high atmosphere Ozone which will see far UV might fill in within bandwidth.

1. A single data point is present 1957 which is probably a dataset error in original transcription.

Read more…

Categories: Datasets, solar

More unexpected solar behaviour, solar magnetic dipole has not crossed zero

June 16, 2013 1 comment

Image

Plot from Wilcox Solar Observatory
(http://wso.stanford.edu/gifs/Dipall.gif)

This is fairly important news given the sun is strongly a magnetic entity, moreover this might be in line with some predictions about a kind of magnetic collapse.

Read more…

Categories: solar

NIST and TSI ” unknown systematic bias”

June 14, 2013 3 comments

Image

Image from PDF on NASA/NIST TSI Workshop July 18-20, 2005,
R. C. Willson click image or link

The brief presentation linked above shows some of the story, more follows…

Read more…

Categories: solar

Solar cycle progress to maximum

February 24, 2012 Leave a comment

wso-polar

The solar polar magnetic field goes through zero at about sunspot cycle maximum, with the magnetic cycle running at half the speed, one reason why alternate sunspot cycles are similar.

The present solar situation is genuinely anomalous with no-one clear on what is going to happen next.

Read more…

Categories: solar

How polar ice is modulated by the sun

April 30, 2011 9 comments

What follows here is a demonstration of how earth orbit shapes Arctic ice and in a later post I intend to show how this may well relate to palaeoclimatology shown in ice cores.

You will have seen the plots of Arctic sea ice. I am going to use one dataset here, which one is unimportant, others give the same answer.

Arctic sea ice extent, monthly data

Read more…

Categories: analysis, filtering, sea ice, solar

ERBS TSI

March 6, 2011 3 comments

As part of an ongoing investigation I looked at the ERBS TSI data. This dataset is not particularly interesting and  as with all satellite data is far too short to say much. One interesting snippet did appear.

Creating a rough model posed some problems but in practice was simple.

First was the data has a Y2K corrupted date which was kindly sorted out by V.

The sampling is irregular (scattered time points) which the software can usually handle if slowly. The result is unremarkable.

I’ve shown a fore and hindcast which indicates the model is stable and sane. It will be somewhat wrong.

A surprise came when I looked at a paper associated with the dataset where the final sentence of the conclusion is “The fact that the measurements increased with time relative to the proxies  suggests the existence of a second TSI variability component with an amplitude greater than 0.04% (0.5 Wm-2), and with a period greater or equal to approximately 20 years.”
A minor model component: 20.0432969909    3.69480925972    0.124480125667

Period just over 20 years, amplitude 0.125 * 2 * sqrt(2) = 0.35W p-p

With such short data that will be way out and TSI certainly is far more complex in the long term.

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.81.834&rep=rep1&type=pdf

I’ve shown SORCE as well. This is not really TSI, is narrowband/is in my opinion incomplete [disputed, see comments]. It does however show the wide variation is measured values. Given the extreme difficulty in making these measurements the usual rule of thumb is sensible, the instrument must be at least an order more accurate and so for absolute maybe we know +-40W sq/m

Putting that into context 40W in 1360W is +-3% of absolute, not as easy as many will imagine and for a remote instrument is an intensely hostile environment would not be a surprise. Lets hope the instrument is returned to earth for post mission calibration checks. See the point?

“Validation of spacecraft active cavity radiometer total solar irradiance  [TSI] long-term measurement trends using proxy TSI least squares analyses

“aRobert Benjamin Lee III and bRobert S. Wilson
aNASA Langley Research Center, Atmospheric Sciences, MS 420, Hampton, VA 23681-2199
Science Application International Corp. (SAIC), One Enterprise Parkway, Hampton, VA 23666 ”

http://www.acrim.com/

A lot of interesting material on TSI  can be found here http://www.leif.org/research/

Categories: analysis, Modelling, solar