CSAGI magnetic storm events with mid-latitude aurora.
|Date||Approximate auroral visibility ° MLAT||Storm strength||Reference||Comment|
|17 and 22 Nov 1882||39||Great||* Love (2018)||Telegraph disruptions (see reference)|
|Dst_est = −386 nT*|
|31 Oct 1903||40||Great||* Hayakawa et al. (2020b)||Telegraph disruptions (see reference)|
|Dst_est = −531 nT*|
|16 April 1938||41||Severe||Nicholson & Sternberg-Mulders (1939)|
|Dcx = −255 nT*|
|24 Mar 1940||41||Great||Nicholson (1940)||Power disruption (see reference)|
|Dcx = −366 nT**||Araki (2014)|
|1 Mar 1941||35||Great||Hayakawa et al. (2021b)||Polar cap absorption|
|Dst_est ≤ −464 nT*|
|18 Sep 1941||Near 40||Great||Love & Coïsson (2016)||Radio and grid disruption, military impacts (see reference)|
|Albuquerque Journal (1941)|
|Dcx = −359 nT**||McNish (1941)|
|28 Mar 1946||< 42||Great||Hayakawa, et al. (2020c)||Radio disruption to transatlantic aviation Odenwald (2007)|
|Dst_est ≤ −512 nT|
|21–22 Sep 1946||Strong||Araki (2014)||Remarkable SC|
|Dcx = −163 nT*||GICs|
Storm strength estimated from citations or published indices, Dcx = reconstructed Dst Index from University of Oulu.
Storm Strength also reported as Dst/Dcx values in Cliver & Svalgaard (2004).
Note some Dcx values may be derived from off scale-magnetograms and thus underestimate the actual magnitude.
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