Tracking a major interplanetary disturbance |
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Authors: | SJ Tappin A Hewish GR Gapper |
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Institution: | Mulliard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0RE, U.K. |
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Abstract: | The severe geomagnetic storm which occurred during 27–29 August 1978 was remarkable because it arrived unexpectedly and was not related to a solar flare or long-lived coronal hole. Observations on 900 celestial radio sources show that the storm was associated with a large-scale region causing enhanced interplanetary scintillation which enveloped the Earth at the same time. The disturbance was first detected on 26 August, when the outer boundary had reached a distance of about 0.8 a.u. from the Sun and it was tracked until 30 August. The enhancement was followed by a fast solar wind stream and its shape suggests that it was a compression zone caused by the birth of the stream. |
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