VHF scintillations and plasma drifts observed in southern Taiwan during the declining phase of solar cycle 24

  • Multi-temporal variations of VHF scintillations investigated at EIA latitude
  • Strong/weak scintillations have different local-time dependences
  • Dayside plasma drifts are prominently westward and nightside drifts are eastward
4 indices, occurrences and east-west drifts are investigated with respect to local time, season, and solar activity. The results show that strong scintillations (S4 > 0.5) appear frequently at early nighttime at equinoxes during the high solar activity year of 2015, while weak scintillations (S4: 0.2 - 0.5) occur often at early daytime and more frequently at early nighttime in summer without obvious correlation with solar activity levels. The peak drift of ~50 - 60 m s-1 is observed eastward at night and westward during the day. Stronger scintillations and higher drift velocities are observed in spring and fall.

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