Incoherent Scatter Radar Studies of Daytime Plasma Lines
Incoherent Scatter Radar Studies of Daytime Plasma Lines
复制标题
白天等离子线的非相干散射雷达研究
DOI:
10.1007/s11038-018-9513-5
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Zhang, Liwei D.
中科院分区:
文献类型:
--
作者:
Djuth, Frank T.;Carlson, Herbert C.;Zhang, Liwei D.
First results from wideband (electron phase energies of 5–51 eV), high-resolution (0.1 eV) spectral measurements of photoelectron–enhanced plasma lines made with the 430 MHz radar at Arecibo Observatory are presented. In theFregion, photoelectrons produced by solar EUV line emissions (He II and Mg IX) give rise to plasma line spectral peaks/valleys. These and other structures occur within an enhancement zone extending from electron phase energies of 14–27 eV in both the bottomside and topside ionosphere. However, photoelectron–thermal electron Coulomb energy losses can lead to a broadened spectral structure with no resolved peaks in the topside ionosphere. The plasma line energy spectra obtained in the enhancement zone exhibit a unique relation in that phase energy is dependent on pitch angle; this relation does not exist in any other part of the energy spectrum. Moreover, large fluctuations in the difference frequency between the upshifted and downshifted plasma lines are evident in the 14–27 eV energy interval. At high phase energies near 51 eV the absolute intensities of photoelectron-excited Langmuir waves are much larger than those predicted by existing theory. The new measurements call for a revision/improvement of plasma line theory in several key areas.
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DOI:
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发表时间:
1961
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影响因子:
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作者:
E. Salpeter
通讯作者:
E. Salpeter
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1969
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1999
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1978
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影响因子:
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作者:
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