Table 4.

Pairs of expansion factors na, nB used for the ForbMod model, and resulting FD amplitudes at SolO HET, CRaTER and the South Pole neutron monitor.

Calculation Sun → Wind SolO → Wind In situ @ Wind Best fit (a)
na 0.70 0.37 0.90 1.08
nB 1.95 (b) 1.30 2.36 (b) 2.01
x(c) 0.55 0.55 0.55 −0.15

AFD, SolO [%] < 0.01 < 0.01 1.25 2.90
AFD, CRaTER [%] < 0.01 < 0.01 0.50 2.00
AFD, SoPo [%] < 0.01 < 0.01 0.03 0.44

Notes. Each column in the table corresponds to one set of input parameters na and nB that was used with ForbMod. The modeled FD amplitude for the GSM data (10 GV) is < 0.01% for all four sets of input parameters and not shown here.

(a)

Best fit was obtained by constraining the FD amplitudes at SolO and CRaTER.

(b)

These quantities were calculated assuming that x = 0.55 (see discussion in Sect. 4.3).

(c)

Calculated using Eq. (4).

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