Abstract
The observation of a U-type solar radio burst with a reversing frequency of approximately 0.7 MHz suggests the presence of a magnetic bottle extending out to about 35 R ⊙. A possible model of this loop structure is developed from the data. The occurrence of low-frequency U-bursts seems to be extremely rare although magnetic bottles may develop frequently during solar maximum.
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Stone, R.G., Fainberg, J. A U-type solar radio burst originating in the outer corona. Sol Phys 20, 106–111 (1971). https://doi.org/10.1007/BF00146101
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DOI: https://doi.org/10.1007/BF00146101