On Sept 20 between 9 and 9.30am UTC three spikes appear on the GOES X-ray flux plotted with data from SWPC. What do you think could have caused these?
http://www.polarlicht-vorhersage.de/...-20_102000.png
The usual plot looks like this - the regular 1.5 hour plateau apparently is a new "feature" from the past four 24-hour cycles.
http://www.polarlicht-vorhersage.de/goes/2018-09-04_055900_2018-09-21_105900.png
What's also notable is that the spikes get normalized out/disappear somehow when you choose different data sets. E.g. in this image which includes 43 hours more data they're gone
http://www.polarlicht-vorhersage.de/...-22_035900.png
You can play with data sets by replacing the date and time stamp in the URL itself. Or by choosing them from the original webpage
http://www.polarlicht-vorhersage.de/goes_archive
With the same timestamp, other GOES monitoring systems don't report a spike. But ~ 12 hours later, at 9pm UTC, GOES-15 hp value goes literally south.
https://www.swpc.noaa.gov/products/goes-magnetometer (attch as screenshot bc it'll vanish in a few hours)
I guess, this could be a normal incident in the fluctuating planetary field around the equinox? (Goes-15 is stationed above ~135* longitude West. hp = "magnetic field vector component, points northward, perpendicular to the orbit plane which for a zero degree inclination orbit is parallel to Earth's spin axis".)
And the graph for incoming solar wind "Radial Speed km/s" dips at 6.45am UTC.
http://www.polarlicht-vorhersage.de/...-20_102000.png
.
My first idea was actually that the new Chinese satellites could have bumped the GOES satellite during positioning. The Chinese rocket launch/booster burn on Sept 19 2pm UTC was documented here on ISS
http://www.iceinspace.com.au/forum/s...d.php?t=170199
The 2nd idea was that the new plateau feature indicates a malfunction and the 3 spikes are one more symptom of the error.
The 3rd idea is the relation to the equinox phenomenon. Archived data would be needed , reaching further back than the 365 days provided in the first URL.
What's your idea?