Temporal Variation of 10.7 cm Solar Radio Flux and Selected Cosmic, Geomagnetic, and Interplanetary Indicators during Solar Cycle 24

On the basis of a temporal analysis of yearly values of the 10.7 cm solar radio flux (F10.7), the maximum coronal mass ejection (CME) speed index (MCMESI), interplanetary magnetic field strength (scalar B), the solar wind speed, cosmic ray intensity and the geomagnetic Ap, Dst and AE indices, we point out the particularities of solar and geomagnetic activity during the last Solar Cycle (Cycle 24).We also analyze the temporal offset between the F10.7 and the above-mentioned solar, geomagnetic, cosmic and interplanetary indices.It is found that this solar activity index, analyzed jointly with interplanetary parameters, cosmic ray intensity, and geomagnetic activity indices, shows a hysteresis phenomenon.It is observed that these parameters follow different paths for the ascending and descending phases of Cycle 24.The hysteresis phenomenon represents a clue in the search for physical processes responsible for linking the solar activity to near-Earth and geomagnetic responses.