Forms of the Dst variation in sporadic and M disturbances of the geomagnetic field

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Geomagnetism, Magnetic Disturbances, Solar Terrestrial Interactions, Solar Wind, Interplanetary Magnetic Fields, Solar Activity Effects

Scientific paper

Two samples of sporadic geomagnetic disturbances are examined: those due to solar flares (sample I) and those due to solar-fibril disappearance (sample II). It is shown that, in 36 percent of the sample I disturbances and 50 percent of the sample II disturbances, the Dst variation has a classical form: a pronounced initial phase, a steep and deep main phase, and a less steep recovery phase. In other cases truncated Dst forms were observed, characterized by a weak development or absence of the main phase. A parallel examination of a large set of M disturbances shows that they are connected with the truncated Dst forms, while the classical form does not appear. It is concluded that the presence of the classical Dst form in a geomagnetic disturbance is a sufficient reason to consider this disturbance a sporadic one.

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