A Survey of Solar Type III Storm Activity Over the Solar Cycle

S.F. Fung, J.L. Green, N. Gopalswamy, M.L. Kaiser, K. Hashimoto, and H. Matsumoto


Among the different types of solar radio bursts, the solar Type-III storm is one
of the least studied solar emissions. Type-III storms are different from regular
(isolated) Type-III bursts in that they are marked by numerous Type-III bursts
that occur at a very high rate (up to several per minute) with the entire storm
lasting from hours to several days. Onset of a solar Type-III storm can be
identified by the transition from a relatively quiet period with relatively few
isolated Type IIIs to a period of intense Type-III activity with a high, nearly
continuous background of fine-scale bursts. Type-III storm bursts also have
higher low-frequency cutoffs than regular, flare-related interplanetary Type
IIIs, indicating that they might be occurring on closed solar field lines. This
paper will present a survey of Type-III storm activities observed by the IMAGE,
Wind and Geotail satellites, and correlating them with SOHO observations to
determine their associations with solar coronal structures observed for over a
solar cycle (from 1992 to the present).

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Western Pacific Geophysics Meeting, 24-27 July 2006, Beijing, China