The dependence of Langmuir wave amplitudes on position in Earth's foreshock

Sigsbee, K.; Kletzing, C. A.; Gurnett, D. A.; Pickett, J. S.; Balogh, A.; Lucek, E.

doi:10.1029/2004gl019413

Cited by 18 publications

(25 citation statements)

References 14 publications

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“…4. In contrast, the probability distribution for all values of D f from Cluster spacecraft 3 on 17 February 2002, discussed in Sigsbee et al (2004), appeared to be Gaussian for amplitudes less than 1-2 mV/m but resembled a power law for larger amplitudes. Figure 4d shows the probability distributions from selected 1 R E bins in D f for spacecraft 4 for the time period 01:30:30-01:51:40 UT on 26 March 2002 with fits to a Gaussian (dotted line).…”

Section: Amplitude Probability Distributionsmentioning

confidence: 86%

“…Only 0.03% of the waveforms observed by spacecraft 4 were excluded due to clipping, but more than 95% of the waveforms had to be rejected because they fell below the minimum amplitude threshold. The result was that the probability distributions constructed for spacecraft 4 on 17 February 2002 by Sigsbee et al (2004) were only valid for uncorrected amplitudes between 2.0 mV/m and 36.9 mV/m. The WBD receiver was designed with a great deal of overlap between the amplitude ranges for the various gain settings, so it may be possible to correct for the effects of non-optimal auto-ranging by comparing the results from different gain states for the same amplitude range.…”

Section: Effects Of Non-optimal Auto-ranging On Statisticsmentioning

confidence: 99%

“…However, in the data presented by Cairns et al the wave amplitudes increased slowly with decreasing D f for 1.0<D f <6.0 R E but increased by more than a factor of 10 between 0.5<D f <1.0 R E , creating a distinct high-field region about 1.0 R E wide. In the 17 February 2002 case, studied by Sigsbee et al (2004), the data from the WBD receiver on spacecraft 3 also show a clear boundary between the foreshock and solar wind, and a distinct high-field region of about 1 R E wide where the amplitudes increase rapidly. The data shown in Fig.…”

Section: Foreshock Coordinate Systemmentioning

confidence: 99%

“…This day was selected because there were relatively steady solar wind conditions during most of the time period that Cluster was located in the foreshock. The data from 26 March 2002 will be compared to results from the WBD receivers on Cluster spacecraft 3 and 4 for 17 February 2002 presented in Sigsbee et al (2004).…”

Section: Introductionmentioning

confidence: 99%

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Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver

Sigsbee

Kletzing²,

Gurnett³

et al. 2004

Ann. Geophys.

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Abstract. We present the statistics of Langmuir wave amplitudes in the Earth's foreshock using Cluster Wideband Data (WBD) Plasma Wave Receiver electric field waveforms from spacecraft 2, 3 and 4 on 26 March 2002. The largest amplitude Langmuir waves were observed by Cluster near the boundary between the foreshock and solar wind, in agreement with earlier studies. The characteristics of the waves were similar for all three spacecraft, suggesting that variations in foreshock structure must occur on scales greater than the 50-100 km spacecraft separations. The electric field amplitude probability distributions constructed using waveforms from the Cluster WBD Plasma Wave Receiver generally followed the log-normal statistics predicted by stochastic growth theory for the event studied. Comparison with WBD receiver data from 17 February 2002, when spacecraft 4 was set in a special manual gain mode, suggests nonoptimal auto-ranging of the instrument may have had some influence on the statistics.

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Section: Amplitude Probability Distributionsmentioning

confidence: 86%

Section: Effects Of Non-optimal Auto-ranging On Statisticsmentioning

confidence: 99%

Section: Foreshock Coordinate Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver

Sigsbee

Kletzing²,

Gurnett³

et al. 2004

Ann. Geophys.

Self Cite

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show abstract

“…All data presented here were observed on 17 February 2002, when Cluster was in the foreshock close to the foreshock boundary given by the interplanetary magnetic field line tangent to the bow shock (tangential line). This region of foreshock is appropriate for our study, since Langmuir waves with the largest amplitudes are observed close to this boundary [Sigsbee et al, 2004].…”

Section: Observationsmentioning

confidence: 99%

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

et al. 2005

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[1] The intense high-frequency electrostatic waves observed in the terrestrial foreshock often have a form of a superposition of two monochromatic waves close to the plasma frequency. We suggest an interpretation of these spectra as signatures of nonlinear decay of Langmuir waves to electron-sound and ion-sound secondary waves. This decay instability is known to have different properties in inhomogeneous plasma, namely the threshold amplitude of this instability is inversely proportional to the scale of the inhomogeneity. We show that the observed dependence of the wave amplitude on the modulation scale of the wave packets is consistent with this property and the theory of absolute decay instability in inhomogeneous plasma can be applied to explain the satellite observations. In this study we used electric field data from the Wide Band Data instrument on board Cluster satellites.

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Statistics of Langmuir wave amplitudes observed inside Saturn's foreshock by the Cassini spacecraft

et al. 2015

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We present the first systematic study of Langmuir wave amplitudes in Saturn's foreshock using the Cassini Radio and Plasma Wave Science/Wideband Receiver measurements. We analyzed all foreshock crossings from June 2004 to December 2009 using an automatic method to identify Langmuir waves. Using this method, almost 3 × 10 5 waveform intervals of typical duration of about a minute were selected. For each selected waveform interval the position of the satellite inside the foreshock was calculated using an adaptive bow shock model, which was parametrized by the observed magnetic field and plasma data. We determined the wave amplitudes for all waveform intervals, and we found that the probability density function amplitudes follow a lognormal distribution with a power law tail. A nonlinear fit for this tail gives a power law exponent of −1.37 ± 0.01. The distribution of amplitudes as a function of the depth in the foreshock shows the onset of the waves near the upstream boundary with its maximum slightly shifted inside the foreshock (∼1 R S ). The amplitudes then fall off with increasing depth in the downstream region. Our results are in agreement with previous observations and roughly follow the generally accepted stochastic growth theory mechanism for the foreshock region, with an exception at the highest observed amplitudes. The estimated energy density ratio W for largest amplitudes does not exceed 10 −2 , suggesting that modulational instability is not relevant for a large majority of waves. The decay instability can be important for the stronger electrostatic waves in Saturn's foreshock, as was previously reported for multiple solar system planets.

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The dependence of Langmuir wave amplitudes on position in Earth's foreshock

Cited by 18 publications

References 14 publications

Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver

Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver

Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations

Statistics of Langmuir wave amplitudes observed inside Saturn's foreshock by the Cassini spacecraft

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