You might have noticed the item today on spaceweather.con about a sine
wave 'ring' in the magnetosphere, on the 17th October at about 16:50
UT.


I had a look at my magnetometer daily plot but at the normal scale
there was just a little fuzz. So I processed a subset of the raw data
and plotted that, and it does seem to show a regular undersampled sine
like variation (with a bit of imagination).
My measurement cadence is 10s, and with the signal period being around
25s I think this is the sort of thing to expect.
My magnetometer is also E-W orientation and maybe it might be more
pronounced in Z (or N-S).

I was wondering if any other magnetometer operators had noticed this.
Might be worth a look and replotting at higher resolution.

I had not realised such high-frequency phenomena existed - I think I
will increase the recording cadence to 1s or 2s to hopefully capture
these better in the future.

Hope this is of interest.

Callum



--
Callum Potter FRAS,
Fealquoy, Rousay, Orkney, Kw17 2PS
Tel. 07967 552211. callum.potter@...
My astronomy website:
And on Substack:
And on twitter at:

Thanks for posting Calum.? I have had a look at my data and no sine wave observed.??
--

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???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

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If you click on the chart image, leads to a better version of the
charts where you can read the time of.


Cheers,
Callum

Hello,

??? ??? I did notice the space weather item, but my single axis sensor, 5 second samples did not record it. We have had PC3 waves reported once in the past, so I will have to dig deep in the records to find it. All observations welcome for the Radio Sky News summary.

Thanks,
John.