Short time scale variability in the solar wind.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Solar Wind: Variability, Solar Wind: Interstellar Matter

Scientific paper

Existing observations of the interplanetary medium over short time scales are incomplete due to lack of steerable telescopes dedicated for such observations. Consequently, understanding of fast interplanetary disturbances and their association to the solar and geomagnetic activity has been inadequate. A programme of interplanetary scintillation observations was, thus, initiated using the Ooty Radio Telescope, where a few strong scintillating sources were monitored over a period of one year. These observations show significant interplanetary activity over a time scale of few minutes to hours. The disturbances observed during the monitoring programme can be understood with a simple model for interplanetary scattering produced by dense plasma objects moving at high velocities. This model was used to associate the events with their origin on the Sun and subsequent geomagnetic activity produced at Earth.

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