We present Culgoora spectrograph and radioheliograph observations as well as a model of type IIIb bursts; the latter are defined as chains of striae of slow or no frequency drift, the chain as a whole drifting like a normal type III burst.The 80 MHz source positions are studied for a group of IIIb bursts, a IIIb precursor and harmonic pairs of 1:2 frequency ratio. It is found that the IIIb position may vary in a IIIb group. No significant difference was found between the source positions of a IIIb precursor and the following III burst. For one event we found that the fundamental IIIb burst showed a high degree of circular polarization (~ 46 %), while its second harmonic, a normal type III burst, was unpolarized.We suggest that the main cause for the striae in type IIIb bursts is the existence of filamentary, density irregularities along the path of the electron stream. The denser filaments initially reduce the value of the density gradient along the electrons' path and thereby enhance their emissions over a small range of plasma frequencies. If the radio emission from the filaments dominates the emission from the ambient rarified plasma, striae appear in the spectrum and a type IIIb burst results. This condition is more easily satisfied at the fundamental frequency and for electron streams of relatively high density.
Two examples of pairs of 'J-shaped' type III bursts with 2: 3 frequency ratio are given. It is suggested that these could be the second and the third harmonics of undetected fundamental radiation. The 80 MHz heliograph source of the third harmonic showed an apparent brightness temperature of 109.6 K, while the order of 1016K seems to be required theoretically. This may imply that the apparent radio source was composed of many unresolved small sources of much higher brightness temperature.
The size of the Magnetosphere is calculated during the period 1996-2011. It is discovered that the magnetopause distance D is quantized for D ≥ 8 RE. The magnetic levels are narrow towards the Earth but widely spaced outwards. This quantization disappears in the lower magnetosphere below 7 RE. Once the magnetopause is compressed to 8-7 RE, multi doors get open which we call the Geomagnetic doors, and the solar wind is injected into the inner magnetosphere then to the ionosphere inducing SID and to the troposphere where it can cause flash floods and seeds of hurricanes.
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