An estimation of the Carrington flare magnitude from
solar flare effects (sfe) in the geomagnetic records

Clarke, Ellen; Rodger, Craig; Clilverd, Mark; Humphries, Thomas; Baillie, Orsolya; Thomson, Alan

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An estimation of the Carrington flare magnitude from solar flare effects (sfe) in the geomagnetic records

Clarke, Ellen; Rodger, Craig; Clilverd, Mark ORCID: https://orcid.org/0000-0002-7388-1529; Humphries, Thomas; Baillie, Orsolya; Thomson, Alan. 2010 An estimation of the Carrington flare magnitude from solar flare effects (sfe) in the geomagnetic records. [Poster] In: RAS NAM 2010 with the UK Solar Physics & MIST Meetinsg, Glasgow, Scotland, 12-16 April 2010. (Unpublished)

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Abstract

The aim of this work was to derive a method of estimating the size of a solar flare from the related magnetic variation, or solar flare effect (sfe), observed at magnetic
observatories. The particular goal was to re-assess the Carrington flare, which occurred at 11.15 UT on 1st September 1859. We review previous work to estimate
the flare magnitude and re-examine observations of the sfe on the Kew and Greenwich (both London area) observatory magnetograms, recovered from the BGS archives. We correlate recent flares of known X-ray flux against the related sfe, taking into account location at the time of the event and use this relationship to estimate the size of the Carrington flare.

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