STUDY OF PECULIAR SOLAR WIND STRUCTURE AT CYCLE 24 SOLAR MINIMUM

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We improved the interplanetary scintillation measurement system of the Solar-Terrestrial Environment Laboratory of Nagoya University, and investigated long-term evolution of the peculiar solar wind structure observed at Cycle 24 solar minimum using data obtained from the system. As result, we found that the solar wind structure evolves with rising solar activity in Cycle 24 rather differently from that in the past cycle. We also found that the solar wind density globally drops in Cycle 24.Our result suggests that the heliosphere is significantly shrinking, and this is of great importance from viewpoint of exploration of the outer heliosphere and study of the space climate.