Velocity observations at high latitude and the acceleration phenomena

M. Kojima, K. Asai, Y. Kozuka, H. Misawa, H. Watanabe, Y. Yamauchi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Interplanetary scintillation (IPS) observations of polar solar wind streams are discussed. The IPS observed several streams which show low speeds (≤400 km/s) inside of 0.3 AU and high speeds (≥700 km/s) outside of 0.3 AU. The foot points of these streams were located in the HeI coronal holes or at their boundaries. Since the IPS measurements are indirect measurements of the solar wind speed, the derived speeds might be biased by one or several mechanisms. We investigate whether the discrepancy between the observations inside and outside of 0.3 AU can be explained by the geometry of low and high speed regions along the line of sight. We also investigate the effect of changing the turbulence level of the electron density, and finally, by comparing observations from different antenna systems, we discuss the effect of the transition from the weak to strong scattering region.

Original languageEnglish
Pages (from-to)101-110
Number of pages10
JournalAdvances in Space Research
Issue number9
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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