Abstract
The distributions of the parameters of the solar wind, IMF, and physical fields (Ey component of the SW electric field, compression field DCF) and the rms errors (σ) of measurements, depending on the daily characteristic of geomagnetic disturbance (Cp), are considered. The scatter of parameters in the interplanetary medium (IM) is actually considerable even during a long interval of geomagnetic quiet. It has been indicated that an unambiguous correspondence between the IM parameters and the characteristic of geomagnetic activity on the Earth is absent, and we have only tendencies toward an increase (decrease) in the parameter of the near-Earth medium (physical quantity) with increasing geomagnetic activity. These tendencies are transformed into linear relationships only after the three-fold averaging of values (hourly, daily, annual), which corresponds to numerous equations of relation between IM parameters and different geomagnetic indices, obtained by many researchers based on statistical analyses.
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