Incoherent Scatter Radar Studies of Daytime Plasma Lines

Djuth, F. T.; Carlson, H. C.; Zhang, Liwei D.

doi:10.1007/s11038-018-9513-5

Cited by 4 publications

(23 citation statements)

References 65 publications

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“…The remaining discrepancy between that study's findings and our results is the exponent from F. T. Djuth et al. (2018), stated as 1.94 from empirical fits, is not exactly 2. This is likely due to the fact that F. T. Djuth et al.…”

Section: Discussioncontrasting

confidence: 97%

“…Recently, a method for mapping peaks in plasma line power to suprathermal energy was proposed in F. T. Djuth et al. (2018). Using Arecibo, those authors empirically fit plasma line power striations and reported the following phase energy—aspect angle relation:

\begin{array}{l} left & E_{p} = D \cos^{1.94} (θ) . \end{array}

…”

Section: Discussionmentioning

confidence: 99%

“…This is because in F. T. Djuth et al. (2018) the phase energy is defined as

E_{p} = \frac{1}{2} m {(\frac{ω_{L}}{k})}^{2}

, whereas we define

E_{ϕ}

using the parallel wavenumber,

k_{∥}

. The relevant energy to map to a suprathermal peak is the Landau resonance energy, which varies as

E_{ϕ} \propto k_{∥}^{- 2}

, and therefore Equation is directly mapping suprathermal energy to contours of the plasma line frequency.…”

Section: Discussionmentioning

confidence: 99%

“…In effect, F. T. Djuth et al. (2018) applies Equation to calculate the energy of the suprathermal peaks, and this is explicitly shown in the heading of their Table 1, which labels the suprathermal peak energies as “

E_{p}

after

\cos^{- 1.94} (θ)

correction”. The remaining discrepancy between that study's findings and our results is the exponent from F. T. Djuth et al.…”

Section: Discussionmentioning

confidence: 99%

“…The first discrepancy is the sign of the exponent on the cosine function. This is because in F. T Djuth et al (2018). the phase energy is defined as E using the parallel wavenumber,  k .…”

mentioning

confidence: 99%

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An Explanation for Arecibo Plasma Line Power Striations

et al. 2021

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Measurements of plasma lines by the Arecibo incoherent scatter radar are known to have sharp striations in power, varying with the plasma frequency and magnetic aspect angle of the radar beam. We explain these power striations as the manifestation of a suprathermal electron population with peaks in energy at approximately 15, 25, and 45 eV. These energies correspond to sharp features in the photoelectron energy spectra measured by rockets and spacecraft. A new theory is developed to predict the plasma line power for an arbitrary, magnetized suprathermal distribution. The magnetization terms in this theory are shown to contribute substantially to the enhancement of plasma line power through inverse Landau and cyclotron damping of the suprathermal peaks. The theory is applied as a forward model to measurements obtained at Arecibo for different magnetic field aspect angles, showing general agreement with the data. At large magnetic aspect angles the theory reproduces the upper‐hybrid instability which can cause 150 km echoes. The developed theory allows for the suprathermal distribution at a given altitude to be probed across a wide range of energies and pitch angles.

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Section: Discussioncontrasting

confidence: 97%

\begin{array}{l} left & E_{p} = D \cos^{1.94} (θ) . \end{array}

…”

Section: Discussionmentioning

confidence: 99%

“…This is because in F. T. Djuth et al. (2018) the phase energy is defined as

E_{p} = \frac{1}{2} m {(\frac{ω_{L}}{k})}^{2}

, whereas we define

E_{ϕ}

using the parallel wavenumber,

k_{∥}

. The relevant energy to map to a suprathermal peak is the Landau resonance energy, which varies as

E_{ϕ} \propto k_{∥}^{- 2}

, and therefore Equation is directly mapping suprathermal energy to contours of the plasma line frequency.…”

Section: Discussionmentioning

confidence: 99%

E_{p}

after

\cos^{- 1.94} (θ)

correction”. The remaining discrepancy between that study's findings and our results is the exponent from F. T. Djuth et al.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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An Explanation for Arecibo Plasma Line Power Striations

et al. 2021

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Ionosphere variability I: Advances in observational, monitoring and detection capabilities

Tsagouri

Belehaki

Themens

et al. 2023

Advances in Space Research

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High‐Resolution Observation of Heater‐Induced Daytime Plasma Fluctuations at Arecibo

et al. 2022

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Numerous experiments have observed the formation of field-aligned irregularities (FAI) during ionospheric heating by high frequency (HF) waves (Carlson & Duncan, 1977;Duncan & Behnke, 1978;Gordon & Carlson, 1974;Utlaut & Violette, 1974). For spatial scales (perpendicular to the field lines) on the order of several kilometers, the formation of these irregularities is frequently attributed to a combination of several plasma instabilities near the altitude where the ordinary mode of the HF heater wave is reflected (Gondarenko et al., 2005). In particular, the resonance instability gives rise to the formation of striations in the plasma on smaller scales (several meters) aligned to the geomagnetic field corresponding to strongly localized enhancements of the electron temperature and depletions of several percent in the electron density (Gurevich et al., 1995(Gurevich et al., , 1998. These irregularities then give rise to additional non-linear effects such as bunching of striations on the kilometer-scale due to self-focusing effects, Langmuir turbulence, etc.

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Incoherent Scatter Radar Studies of Daytime Plasma Lines

Cited by 4 publications

References 65 publications

An Explanation for Arecibo Plasma Line Power Striations

An Explanation for Arecibo Plasma Line Power Striations

Ionosphere variability I: Advances in observational, monitoring and detection capabilities

High‐Resolution Observation of Heater‐Induced Daytime Plasma Fluctuations at Arecibo

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