Radio evidence for electron acceleration in a cusp-like structure

✍ Scribed by A. Klassen

• Book ID: 104641024
• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 526 KB
• Volume: 167
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00146354

✦ Synopsis

In the speckrum of the t)2ae IV/II radio burst of 1994 July 18 we found a rare superposition of fast and slowly drifting features in the frequency range 100-3001MI-Iz about 1 rain before the onset of the shock induced meter wave type II burst. We take this as signatures of the passage of an MUD-like disturbance and the simultaneous injection of two eontradirected electron beams. These beams are manifested as an ordinary type 1]1 burst and a reverse drift burst starting at the same frequency. Remarkably, the reverse drilY burst is visible only due to its absarbtion trace in an underl~Sng continuum patch. We argue that the superimposed burst features are emitted from a common source which covers the top of a closed magnetic field structure and the immediately superposed part (cusp) of the helmet streamer configuration. The radio source is situated immediately at the electron acceleration site.