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Density Fluctuations in the Solar Wind Based on Type III Radio Bursts Observed by Parker Solar Probe by Vratislav Krupar; Adam Szabo; Milan Maksimovic; Oksana Kruparova; Eduard P. Kontar; Laura A. Balmaceda; Xavier Bonnin; Stuart D. Bale; Marc Pulupa; David M. Malaspina; John W. Bonnell; Peter R. Harvey; Keith Goetz; Thierry Dudok de Wit; Robert J. MacDowall; Justin C. Kasper; Anthony W. Case; Kelly E. Korreck; Davin E. Larson; Roberto Livi; Michael L. Stevens; Phyllis L. Whittlesey; Alexander M. Hegedus is a Physics and Astronomy article available to read on EtoBox.
What is Density Fluctuations in the Solar Wind Based on Type III Radio Bursts Observed by Parker Solar Probe about?
Abstract Radio waves are strongly scattered in the solar wind, so that their apparent sources seem to be considerably larger and shifted than the actual ones. Since the scattering depends on the spectrum of density turbulence, a better understanding of the radio wave propagation provides indirect information on the relative density fluctuations, , at the effective turbulence scale length. Here, we analyzed 30 type III bursts detected by Parker Solar Probe (PSP). For the first time, we retrieved type III burst decay times, , between 1 and 10 MHz thanks to an unparalleled temporal resolution of PSP. We observed a significant deviation in a power-law slope for frequencies above 1 MHz when compared to previous measurements below 1 MHz by the twin-spacecraft Solar TErrestrial RElations Observatory (STEREO) mission. We note that altitudes of radio bursts generated at 1 MHz roughly coincide with an expected location of the Alfvén point, where the solar wind becomes super-Alfvénic. By comparing PSP observations and Monte Carlo simulations, we predict relative density fluctuations, ε, at the effective turbulence scale length at radial distances between 2.5 and 14 to range from 0.22 to 0.09.
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- Author
- Vratislav Krupar; Adam Szabo; Milan Maksimovic; Oksana Kruparova; Eduard P. Kontar; Laura A. Balmaceda; Xavier Bonnin; Stuart D. Bale; Marc Pulupa; David M. Malaspina; John W. Bonnell; Peter R. Harvey; Keith Goetz; Thierry Dudok de Wit; Robert J. MacDowall; Justin C. Kasper; Anthony W. Case; Kelly E. Korreck; Davin E. Larson; Roberto Livi; Michael L. Stevens; Phyllis L. Whittlesey; Alexander M. Hegedus
- Publisher
- University of Chicago Press; American Astronomical Society; Institute of Physics Publishing; IOP Publishing (ISSN 0067-0049)
- Published
- 2020
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)