Erratum to: Analysis of the ground level enhancements on 14 July 2000 and on 13 December 2006 using neutron monitor data
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Erratum to: Solar Phys (2016) 291:1225–1239 DOI 10.1007/s11207-016-0877-2
An error has been found in the paper by Mishev and Usoskin (2016) that is related to the presentation of Figure 6, which depicts the computed neutron monitor (NM) asymptotic directions during GLE 70 on 13 December 2006 and the apparent direction of the interplanetary magnetic field (IMF) at 03:00 UT as derived from the ACE satellite measurements. We note that the latter (the apparent position of the IMF direction) is incorrectly shown in the figure, with no consideration of the propagation time between the L1-point, where the ACE spacecraft is located, and the Earth’s location. Moreover, the instant value of IMF was taken, without averaging for the period of gyration of energetic particles.
We have checked that this error does not affect the main results of the article (reconstruction of the energy spectra and pitch-angle distribution) since the erroneous IMF position was used only as the first guess for the iterative fitting procedure, and the final result of the fit remains unaltered. Accordingly, the derived rigidity spectra and anisotropy characteristics shown in Figure 7 and summarized in Table 2 are correct.
We would like to acknowledge Leon Kocharov who found and discussed with us this error. This work was supported by the Center of Excellence ReSoLVE (Academy of Finland project No. 272157).