Type II solar radio bursts and radiation from Earth's foreshock
- We analyzed and interpreted observations of an unusual continuum radiation associated with a metric type II burst [Leblanc et al., 2000], both believed to be radio emissions associated with a shock wave.
- An analytic model for the electrostatic potential jump across collisionless shocks was developed and applied to Earth's bow shock [Kuncic et al., 2002a]. The theory appears consistent with existing data.
- A detailed, semiquantitative analytic theory was developed for interplanetary type II solar radio bursts [Knock et al., 2001]. It involves the reflection and acceleration of electrons at shocks (incorporating the theory for the cross-shock potential [Kuncic et al., 2002]), the development of electron beams in the foreshock by time-of-flight effects, the generation of Langmuir waves with energy flows described by SGT, and the generation of fp and 2fp radiation by nonlinear processes. The theory appears consistent with available data for one well-observed interplanetary type II solar burst.
- We generalized the type II theory to Earth's foreshock radiation, showing that the theory appears consistent with available data, typically predicting fluxes within a factor of about 2 of those observed [Kuncic et al., 2002b].
- We reviewed the observations and theory of radiation for Earth's foreshock, the foreshocks of interplanetary type II bursts, type III solar radio sources, and the outer heliospheric radiation observed at 2-3 kHz by the Voyager spacecraft [Cairns et al., 2000; Robinson and Cairns, 2000; Cairns and Kaiser, 2001]. Except for type III bursts, these applications all potentially involve the foreshock theory of Knock et al. [2001].
- More recently we extended the type II theory to predict the radiation flux as a function of the shock and solar wind parameters [Knock et al., 2002], as well as relating the theory to space weather events.
