Observations of correlated broadband electrostatic noise and electron cyclotron emissions in the plasma sheet

Roeder, J. L.; Angelopoulos, V.; Baumjohann, W.; Anderson, R. R.

doi:10.1029/90gl02036

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…The potential as a function of height above the lunar surface from the PIC model for three different cases of plasma sheet ion temperature, T i = 500, 1000, 2000 eV, for constant electron temperature, T e = 500 eV, and density, n ps = 10 5 m À3 . acoustic instability from the streaming photoelectrons and the instability of the loss cone anisotropy, similar to that outlined by Roeder et al [1991], especially given the high degree of correlation between the BEN and the presence of the photoelectron beam. We suggest that the presence of both BEN and electron cyclotron harmonic emissions near airless bodies can be used as a diagnostic in searching for surfacegenerated electron beams and possible non-monotonic potentials at other airless bodies [Gurnett et al, 1981;Kurth et al, 1987Kurth et al, , 2001Santolík et al, 2011].…”

Section: Comparison To Artemis Datasupporting

confidence: 58%

“…The BEN is present at times when the beam is at relatively high energies, yet ceases when the beam has either disappeared (11:59-12:01) or when the beam is at a very low energy level (12:13-12:25). One possible mechanism for the generation of both the BEN and the previously mentioned electron cyclotron harmonic emissions may be the coupling of the electron acoustic instability from the streaming photoelectrons and the instability of the loss cone anisotropy, similar to that outlined by Roeder et al [1991], especially given the high degree of correlation between the BEN and the presence of the photoelectron beam. We suggest that the presence of both BEN and electron cyclotron harmonic emissions near airless bodies can be used as a diagnostic in searching for surfacegenerated electron beams and possible non-monotonic potentials at other airless bodies [Gurnett et al, 1981;Kurth et al, 1987Kurth et al, , 2001Santolík et al, 2011].…”

Section: Poppe Et Al: Artemis Lunar Dayside Observations L01102 L01102mentioning

confidence: 99%

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A comparison of ARTEMIS observations and particle‐in‐cell modeling of the lunar photoelectron sheath in the terrestrial magnetotail

Poppe

Halekas

Delory

et al. 2012

Geophysical Research Letters

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[1] As an airless body in space with no global magnetic field, the Moon is exposed to both solar ultraviolet radiation and ambient plasmas. Photoemission from solar UV radiation and collection of ambient plasma are typically opposing charging currents and simple charging current balance predicts that the lunar dayside surface should charge positively; however, the two ARTEMIS probes have observed energydependent loss cones and high-energy, surface-originating electron beams above the dayside lunar surface for extended periods in the magnetosphere, which are indicative of negative surface potentials. In this paper, we compare observations by the ARTEMIS P1 spacecraft with a onedimensional particle-in-cell simulation and show that the energy-dependent loss cones and electron beams are due to the presence of stable, non-monotonic, negative potentials above the lunar surface. The simulations also show that while the magnitude of the non-monotonic potential is mainly driven by the incoming electron temperature, the incoming ion temperature can alter this magnitude, especially for periods in the plasma sheet when the ion temperature is more than twenty times the electron temperature. Finally, we note several other plasma phenomena associated with these non-monotonic potentials, such as broadband electrostatic noise and electron cyclotron harmonic emissions, and offer possible generation mechanisms for these phenomena.

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Section: Comparison To Artemis Datasupporting

confidence: 58%

Section: Poppe Et Al: Artemis Lunar Dayside Observations L01102 L01102mentioning

confidence: 99%

A comparison of ARTEMIS observations and particle‐in‐cell modeling of the lunar photoelectron sheath in the terrestrial magnetotail

Poppe

Halekas

Delory

et al. 2012

Geophysical Research Letters

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“…Intense broadband electrostatic noise, extending from 100 Hz to several kHz, may be present outside the plasmapause during enhanced magnetic activity, especially on the night‐side [e.g., Roeder et al , 1991]. These emissions, which could contaminate the observations of the magnetosonic waves, were removed from the database using the following criteria.…”

Section: Crres Databasementioning

confidence: 99%

Survey of magnetosonic waves and proton ring distributions in the Earth's inner magnetosphere

2008

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[1] Fast magnetosonic waves can lead to the local acceleration of electrons from $10 keV up to a few MeV on a timescale of 1-2 d and may play an important role in radiation belt dynamics. Here we present a survey of wave and particle data from the Combined Release and Radiation Effects Satellite (CRRES) to determine the global morphology of the waves as a function of magnetic activity, and to investigate the role of proton rings as a potential source mechanism. The intensity of fast magnetosonic waves in the frequency range 0.5 f LHR < f < f LHR increases with increasing magnetic activity suggesting they are related to periods of enhanced convection and/or substorm activity. They are observed at most magnetic local times (MLT) outside the plasmapause but are restricted to the dusk sector inside the plasmapause. The MLT distribution of low energy proton rings (E R < 30 keV) with energies exceeding the Alfvén energy (E R > E A ) required for instability closely matches the distribution of magnetosonic waves on the dusk side, both inside and outside the plasmapause, suggesting that low energy proton rings are a likely source of energy driving the waves. However, intense magnetosonic waves are also observed outside the plasmapause on the dawn-side that do not satisfy (E R > E A ). Although proton rings with E R > 30 keV could drive the instabilities, the source of these waves is yet to be properly identified. Since fast magnetosonic waves can accelerate electrons we suggest that they may provide a significant energy transfer process between the ring current and the outer electron radiation belt.

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“…Due to the boundedness of sweep frequency receiver on board the CRRES spacecraft, Meredith et al () identified the band of waves between 0.5 f LHR < f < f LHR within 3° of the magnetic equator as MS waves at a reasonable coverage in 2 < L <7 . Since their criteria may include intense broadband electrostatic noises from 100 Hz to several kilohertz (Roeder et al, ), Meredith et al () eliminated the emissions, whose power‐spectral density (PSD) of electric field at 1.5 f LHR are both greater than 2.0 × 10 ‐4 mV 2 /Hz and within a factor of 5 for those at 0.75 f LHR . Němec et al () also gave a method to identify the EN emissions (here they call MS waves as equatorial noise, EN) for the observations of Cluster from 2001 to 2010, that is, fulfilling the conditions of planarity >0.8, ellipticity <0.2, and WNA >85°, with the spectrum frequency between 0 and 200 Hz.…”

Section: Introductionmentioning

confidence: 99%

An Automatic Detection Algorithm Applied to Fast Magnetosonic Waves With Observations of the Van Allen Probes

Yuan

Yao

et al. 2019

JGR Space Physics

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Fast magnetosonic (MS) waves can play an important role in the evolution of the inner magnetosphere. However, there is still not an effective method to quantitatively identify such waves for observations of the Van Allen Probes reasonably. In this paper, we used Van Allen Probes data from 18 September 2012 to 30 September 2014 to find a more comprehensive automatic detection algorithm for fast MS waves through statistical analysis of the major properties, including the planarity, ellipticity, and wave normal angle of whole fluctuations using the singular value decomposition method. According to a control variate method, we find an obvious difference between fast MS waves and other waves in the statistical distribution of their major properties. After eliminating the influence of background noises, by excluding fluctuations at L < 1.8, we set up an automatic detection algorithm applied to fast MS waves, that is, smaller than 0.2 for the absolute value of wave ellipticity, larger than 70° for the wave normal angle, with frequency range of 2 Hz to 1.5 fLHR (fLHR is the local lower hybrid resonance frequency). Finally, we have checked the planarity to verify availability of this method and tested this completely automatic method on the Van Allen Probes data and found some results consistent with previous studies. Inside the plasmapause, we found that there is a more obviously favorable occurrence of MS waves at dusk sector with increasing magnetic latitudes.

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Observations of correlated broadband electrostatic noise and electron cyclotron emissions in the plasma sheet

Cited by 9 publications

References 9 publications

A comparison of ARTEMIS observations and particle‐in‐cell modeling of the lunar photoelectron sheath in the terrestrial magnetotail

A comparison of ARTEMIS observations and particle‐in‐cell modeling of the lunar photoelectron sheath in the terrestrial magnetotail

Survey of magnetosonic waves and proton ring distributions in the Earth's inner magnetosphere

An Automatic Detection Algorithm Applied to Fast Magnetosonic Waves With Observations of the Van Allen Probes

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