Abstract


  3-D DISTRIBUTION OF SOLAR WIND SPEED AND SMALL-SCALE PLASMA DENSITY TURBULENCE DURING SOLAR CYCLES 22-24

  P. Manoharan, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, , mano@ncra.tifr.res.in
  P. Manoharan, Tata Institute of Fundamental Research (RAC-NCRA), mano@ncra.tifr.res.in

In this talk, I will review the three-dimensional evolution of "quiet" solar wind speed and plasma density turbulence at various levels of solar activity between solar cycles 22 and 24. The period of minimum phase of solar cycle 23 was rather unusually prolonged in duration. When compared to the similar phase of previous solar cycle(s), it was much deeply quieter in activity, weaker in polar fields, and slower in solar wind speed. At the above minimum phase, a relatively low plasma density also pervaded the inner heliosphere. A downward trend in density turbulence has been observed from the maximum of cycle 22 to the deep minimum phase of cycle 23 and beyond. Moreover, the latitudinal distribution of solar wind speed has been significantly different during the above period. I will also highlight the shape of spatial spectrum of plasma turbulence (including the spatial cut-off scale of plasma turbulence of the solar wind) for the peculiar solar minimum, which has been, thus far, quite distinct.