GSSN - Interpolated Sunspot area and Synoptic Sunspot Map 1874-2012
By interpolating far-side Sunspots,
the false 27-day signal is almost removed, so that the Sunspot record can be explored without
23 Mb for download (Gssn_Interpolated_1874-2012.zip),
data-files and program to generate 3.5Gb of PNG files with Sunspot maps
(1-2 hours of runtime needed to generate), spanning years 1874-2012,
with the basic charted data already included...
(If you would like the data but do not want or cannot generate them, contact me at semi(at)gurroa(dot)cz ,
asking the price for a DVD sent by conventional postal mail - I think the price will be a fair fee for packing&postage...)
Connection with Earth-Venus-Jupiter syzigy and quadratures is shown on an included chart...
For the interpolation, the source Greenwich and USAF data-files were manually cleared from errors
(mostly in USAF data, the method for identifying erroneous records is described, the records
are commented-out from source data files, search for # comments...), then if the individual
sunspot group is matched on the next rotation, it is linearly interpolated on the far side
to its new position and size, if it is not matched, it is linearly interpolated in 17 days to zero...
This way, most of the false 27-day signal in Sunspot record is removed, but not all:
Sunspots, appearing on far side first, we get little later, and Sunspots, that disappear over
western limb and do not get matched next time, are interpolated to fadeout, making a typical 17-day
decay curves in the chart.
The chart with Sunspot area is available as single PNG file
(or a large version),
(192 pixels per year, 27k pixels wide image)
(Data for the chart is available in the ZIP-file above...)
Tidal bulge is calculated from conventional oceanographic vector formulas for tides, then the vector
sum of all-surface vectors becomes the "bulge" vector. The method is, that the vectors toward the
most strong planet are taken as is, and oposing vectors are taken inverted (otherwise the vector sum
is zero, because conventional oceanographic vector formulas produce symmetric tides).
Hence the Tidal bulge size is proportional to the size of tidal force on the solar surface.
On more inspection of the behaviour of tides on the Sun, it is seen, that the bulge is some times
stationary, some times it makes rather a fast rotation, for ex. as the Mercury moves through perihelium.
The Tidal bulge omega shows the function VectorOmega(TidalBulge) * VectorLength(TidalBulge)^2,
accenting the times, when the tidal bulge is largest and rotates fast...
The Sunspot Cycle starts are marked by a first occurence of high-latitude Sunspots of the new cycle...
Overall view of the chart data:
On the Sunspot maps, it can be shown, that Sunspots appear at or soon after Jupiter, Venus and Earth
syzigies, at the places below the planets at the time of syzigy. For Earth-Venus opositions,
the affected region is longer, since the event takes quite longer time and the Sun rotates below...
Often the Sunspots arise on the affected place just at the next rotation (when they get next time into view)
The program calculates Sunspot groups from Greenwich and USAF data and produces 1 PNG file for each
To paint planet positions on the Synoptic map, the EphView program (for Win32 platform, freeware)
can be used.
The chart is opened in EphView program by drag-dropping the XML file to running EphView program,
the manual for displaying the synoptic map with planet positions is available in the download file...
On this preview, the crosses with planet names are displayed by EphView program on synoptic view.
Otherwise, the original map images contain a green dot in place of Earth, contain black circles
with Sunspots by area (in milionths of hemisphere), gray circles where the Sunspot is interpolated.
The yellow background are previous sunspot positions in recent cca 10 years (while
generating the maps, in mk.bat there is a flag to generate the maps without the yellow background)...
By P.A.Semi, 2012 ...