Computer Science – Sound
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51a..05s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM51A-05
Computer Science
Sound
2467 Plasma Temperature And Density, 2400 Ionosphere, 2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712)
Scientific paper
The Physics of Auroral Zone Electrons II (PHAZE II) sounding rocket was launched at 0517 UT on 10 February 1997, from Poker Flat, Alaska, into active pre-midnight aurora, reaching an apogee of 945 km. The payload included a wideband wave receiver with frequency response up to 5 MHz. The resulting wave data are rich in Langmuir waves which have been studied extensively [e.g., McAdams et. al., 1999]. Consistent with many previous observations, the Langmuir waves are sporadic, occurring in bursts of duration from a few ms to a few hundred ms. We re-examine these auroral Langmuir wave data in light of stochastic growth theory (SGT) which has recently been shown to explain the statistics of Langmuir waves in the Earth's electron foreshock [Cairns et. al., 1997]. From inspection of the Langmuir wave data, we select a large number of wave bursts for detailed study. We then detrend the electric field and produce histograms of the wave electric fields. The resulting distributions of electric fields, plotted in log-space, are well described by Gaussian functions provided that the interval over which they are accumulated is sufficiently short. In some examples, there is a suggestion of a tail on the Gaussian distribution, although in no individual case studied does this effect exceed the 90 percent confidence level. This study indicates that SGT may have some applicability to the generation of Langmuir waves in the auroral ionosphere. McAdams, K. L., J. LaBelle, M. L. Trimpi, P. M. Kintner, and R. A. Arnoldy, Rocket Observations of banded structure in HF waves near the Langmuir frequency in the auroral ionosphere, J. Geophys. Res., 104, 28109, 1999. Cairns, I. H., P. A. Robinson, First test of stochastic growth theory for Langmuir waves in Earth's foreshock, Geophys. Res. Lett., 24, 369, 1997.
LaBelle James
Samara M.
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