Plasma theory of radio echoes from the Sun and its implications for the problem of the solar wind

作者: I.M. Gordon

DOI: 10.1007/BF00169320

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摘要: It is demonstrated that the solar radio echo data cannot be understood in framework of conventional theories reflections from those coronal layers, where refraction index n = 0, moving inhomogeneities or shock fronts. was found all peculiar and unexpected features spectra can explained by theory its formation amplification induced processes scattering turbulent pulsations plasma. So, structure brings information, not only about systematic large-scale motions plasma, but also plasma pulsation spectrum, temperature density as well. reflected signal originates disturbed zones situated above active regions while quiet corona are weak completely absent. The analysis shows comparatively thin layers regions, rapid acceleration heating wind sometimes take place. velocity gradient to changing fairly wide limits. Solar velocities high 120 km/s were observed at a distance ≈ 1.5 R ⊙ Sun's centre. source energy for dissipation pulsations. These precludes possibility continuous flow possess character detonation waves. anticipated non-thermal which postulated remove discrepancies between existing models observations wind, localized mainly these thus playing an important role fundamental properties interplanetary medium. further development it prime importance obtain complete information actual time-space distribution additional sources acting ‘active’ corona. This gained radar probing Sun frequency range 40 10 MHz with scanning beam such would enable monitoring Sun. Combined experiments simultaneous sporadic radio-emission may value, since result comparison state obtained through two different channels, full description local region could achieved.

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