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Fig. 3.


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Panel a: sketch of the global situation (upper panel: rest frame; lower panel: frame of reference rotating with the Sun); for details, see the main text. Panel b: schematic presentation of the geometry and CIR characteristics (fixed reference frame), as applied in the model (x0 and xe represent the beginning and end of CIR and HSS at 1 au, respectively; for details, see the main text). Panel c: dependence of the radial CR-gradient, Gr, for three specific s/c positions (x1, x2, x3) as a function of heliocentric distance, r. The heliocentric distance of the CIR frontal edge for the three specific s/c positions, xi, are denoted r1, r2, r3. Panel d: corresponding radial distance dependence of the cosmic ray count rate, Φxi(r), between CIR and HSS outer boundary and s/c. The red line marks the behavior in a quiet-Sun situation at the CIR outer boundary. Panel e: sketch of the resulting Forbush decrease profile, Φ(t), as measured by the s/c.

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