Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51d1701m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH51D-1701
Physics
Plasma Physics
[6984] Radio Science / Waves In Plasma, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7815] Space Plasma Physics / Electrostatic Structures, [7847] Space Plasma Physics / Radiation Processes
Scientific paper
With the ultimate goal of including the contributions of Langmuir waves localized as eigenmodes of solar wind density cavities in solar radio burst models, we use simulated turbulent density profiles and analytic models of linear and eigenmode wave growth to explore variation in the availability of linear and eigenmode growth locations as well as each population’s amplitude distribution as a function of distance from the Sun. Observations show that there are two manifestations of electrostatic Langmuir wave in the solar wind: non-localized linear waves and localized eigenmodes. Regions of low density turbulence have more 'flat spots' where linear wave growth is favored. Regions of high density turbulence have more density wells where eigenmode formation is possible. At 1AU, observations show that linear Langmuir waves are much more numerous, but generally reach lower amplitudes than eigenmode waves. Both convective and eigenmode radiation models predict that the intensity of electromagnetic radiation generated from either type of Langmuir wave scales with the amplitude of the wave (E) as E^2 for radiation at the generation region plasma frequency (fp) and E^4 for radiation at 2fp. Therefore, it is important to include localized Langmuir waves in radio burst models since the less numerous but higher amplitude eigenmodes will contribute a large fraction of the Langmuir radiation observed as type II and type III radio bursts at 1AU. The relative expression of each population depends strongly on the magnitude of the solar wind density turbulence at the growth region (dn/n) as well as the form of the power spectrum of solar wind density fluctuations at Langmuir wavelength scales. We also discuss possible measurements by the future Solar Probe Plus mission that can address the contributions of eigenmode Langmuir waves to solar radio bursts.
Ergun Robert E.
Hess Sebastian
Malaspina D.
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