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I'll assume that compared to the size of the ISS, the geomagnetic field is uniform over a small region. In that case, could that magnetic field be measured inside the ISS? To illustrate the question:

uniform magnetic field around cylinder

If we consider a cross-section of a module on the ISS (a cylinder), what does the magnetic field look like inside?

It seems the wall is made of a layer of ceramic-fiber or kevlar mesh material between the exterior thin aluminum sheet (2mm) and the aluminum pressure hull (3mm). [ref1, ref2], so the surface is a conductor.

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The answer is a clear yes (which you can see directly in measurements of the magnetic field taken inside the ISS).

https://www.raspberrypi.org/learning/astro-pi-flight-data-analysis/worksheet/

Since Aluminium is not ferromagnetic this makes sense. It would still be interesting to understand the "shape" of the magnetic field inside the region outlined above.

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    $\begingroup$ It'll look extremely noisy. All that electric equipment generates its own magnetic field, but now with much stronger spatial variations. $\endgroup$ – Emilio Pisanty Oct 28 '17 at 5:38
  • $\begingroup$ The fields from all the stuff on the ISS can be huge compared to Earth's rather small field (~30,000 nT). Even spacecraft buses produce significant enough fields that they need to be removed when making magnetic field measurements in space plasmas. $\endgroup$ – honeste_vivere Nov 17 '17 at 19:32
  • $\begingroup$ @honeste_vivere, Why would it be different from the interference from electronics / electrical appliances in a normal home vs. the small magnetic field of the Earth? The data I linked above (measured inside the ISS) shows a pretty clean curve without "huge" disruptions. $\endgroup$ – Massagran Nov 25 '17 at 20:29
  • $\begingroup$ Oh, I am sure they can measure it I am just saying that the induced fields from geomagnetic storms etc. are quite small compared to the fields generated by the station and instruments on board. $\endgroup$ – honeste_vivere Nov 26 '17 at 15:08

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