Advances in Plasmaspheric Wave Research with CLUSTER and IMAGE Observations

Masson, A.; Santolı́k, O.; Carpenter, D. L.; Darrouzet, F.; Décréau, Pierrette; Mazouz, F. El-Lemdani; Green, James L.; Grimald, S.; Moldwin, M. B.; Němec, F.; Sonwalkar, V. S.

doi:10.1007/s11214-009-9508-7

Cited by 10 publications

(4 citation statements)

References 154 publications

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“…Field‐aligned incidence onto the ionosphere can result from propagation in a field‐aligned density irregularity or duct [ Smith et al , 1960]. Recent results from the Radio Plasma Imager on board the IMAGE spacecraft have shown that the magnetosphere is permeated by irregular density structures that support ducted wave propagation over a wide range of frequencies (see review by Masson et al [2009]). Alternatively, ELF/VLF waves propagating in a nonducted mode, at frequencies below half of the equatorial gyrofrequency, can reach the ionosphere with vertical incidence through a set of specialized ray paths.…”

Section: Diurnal Wave Patternmentioning

confidence: 99%

Drivers of chorus in the outer dayside magnetosphere

Spasojević

Inan

2010

J. Geophys. Res.

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[1] Using ELF/VLF wave data recorded in 2007 from two high-latitude (L = 69.8°, 71.8°) Antarctic ground stations, the dayside variation of chorus wave occurrence and amplitude are analyzed in conjunction with geomagnetic and solar wind driving parameters. Both stations observe chorus (defined here as discrete rising emission tones together with unstructured hiss) in a broad window of local time across the dayside when the stations are on closed magnetic field lines. Wave occurrence rates rise rapidly from ∼0.06-0.12 at dawn to their maximum value of ∼0.5-0.6 near local noon. The event amplitudes also peak near noon. Occurrence probabilities at the lower-latitude station are consistently higher with the average difference in the rate between the two stations being 0.15. In addition, ∼80% of the time, event amplitudes are larger at the lower-latitude site. When the stations are in the dawn local time sector (5.5 < MLT < 10), the onset of waves is clearly linked to substorms, as seen by the AE index as well as by energetic electron injections observed at geosynchronous orbit. However, as the stations rotate to noon (MLT > 10), wave occurrence rates appear to be relatively independent of geomagnetic activity as measured by K p and AE. Chorus near noon at times appears related to substorm activity, but intense waves can also be observed during extended quiet periods. Waves across the entire dayside are more likely during higher solar wind dynamic pressure as well as during significant changes in pressure. We attribute the high occurrence rate of outer dayside chorus to several effects resulting from solar wind compression of the dayside magnetosphere; the first is electron drift shell splitting, and the second is the creation of a region of high magnetic field homogeneity which is particularly favorable for wave growth.

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Section: Diurnal Wave Patternmentioning

confidence: 99%

Drivers of chorus in the outer dayside magnetosphere

Spasojević

Inan

2010

J. Geophys. Res.

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“…Those energetic and anisotropic ring current protons are considered to provide the major source of free energy driving this instability and causing the amplification of EMIC waves [ Anderson et al , 1992a; Erlandson and Ukhorskiy , 2001; Engebretson et al , 2007]. Since the instability threshold is so low that EMIC waves are easily generated in the presence of cold dense ions [ Gary et al , 1995], strong enhancements of the EMIC wave power occur at the plasmapause [ Anderson et al , 1992a; Fraser and Nguyen , 2001; Masson et al , 2009]. In fact, since cold He + ions have a strong influence on the proton cyclotron electromagnetic instability [ Gomberoff and Cuperman , 1982; Kozyra et al , 1984], most observed EMIC waves in the frequency range of Pc1‐2 have spectra whose characteristic frequencies are organized in the vicinity of the He + gyrofrequency at the equatorial plane [ Young et al , 1981; Sakaguchi et al , 2008].…”

Section: Introductionmentioning

confidence: 99%

Link between EMIC waves in a plasmaspheric plume and a detached sub‐auroral proton arc with observations of Cluster and IMAGE satellites

Yuan

Deng

Lin

et al. 2010

Geophysical Research Letters

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[1] In this paper, we report observations from a Cluster satellite showing that ULF wave occurred in the outer boundary of a plasmaspheric plume on September 4, 2005. The band of observed ULF waves is between the He + ion gyrofrequency and O + ion gyrofrequency at the equatorial plane, implying that those ULF waves can be identified as EMIC waves generated by ring current ions in the equatorial plane and strongly affected by rich cold He + ions in plasmaspheric plumes. During the interval of observed EMIC waves, the footprint of Cluster SC3 lies in a subauroral proton arc observed by the IMAGE FUV instrument, demonstrating that the subauroral proton arc was caused by energetic ring current protons scattered into the loss cone under the Ring Current (RC)-EMIC interaction in the plasmaspheric plume. Therefore, the paper provides a direct proof that EMIC waves can be generated in the plasmaspheric plume and scatter RC ions to cause subauroral proton arcs. Citation: Yuan, Z., X. Deng, X. Lin, Y. Pang, M. Zhou, P. M. E. Décréau, J. G. Trotignon, E. Lucek, H. U. Frey, and J. Wang (2010), Link between EMIC waves in a plasmaspheric plume and a detached sub-auroral proton arc with observations of Cluster and IMAGE satellites, Geophys. Res. Lett., 37, L07108,

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“…The Earth's plasmasphere is an important plasma region of the terrestrial magnetosphere‐ionosphere system, playing a significant role in the dynamics of the magnetosphere‐ionosphere coupling during quiet and active periods alike (Darrouzet et al., 2009; Goldstein et al., 2004; Kotova, 2007; Lemaire & Gringauz, 1998; Masson et al., 2009; Moldwin et al., 2016; Reinisch et al., 2009; Yizengaw & Moldwin, 2005). During magnetic storms the mass loading and unloading of the plasmasphere is an integral part of the storm process, with widespread implications for a variety of processes in the magnetosphere and/or ionosphere (Sheeley et al., 2001; Yizengaw et al., 2005a).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Least Squares Fitting Technique for the Determination of Field Line Resonance Frequency in Ground Magnetometer Data: Application to Remote Sensing of Plasmaspheric Mass Density

et al. 2021

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The accurate determination of the field line resonance (FLR) frequency of a resonating geomagnetic field line is necessary to remotely monitor the plasmaspheric mass density during geomagnetic storms and quiet times alike. Under certain assumptions the plasmaspheric mass density at the equator is inversely proportional to the square of the FLR frequency. The most common techniques to determine the FLR frequency from ground magnetometer measurements are the amplitude ratio (AR) and phase difference (PD) techniques, both based on geomagnetic field observations at two latitudinally separated ground stations along the same magnetic meridian. Previously developed automated techniques have used statistical methods to pinpoint the FLR frequency using the AR and PD calculations. We now introduce a physics‐based automated technique, using nonlinear least squares fitting of the ground magnetometer data to the analytical resonant wave equations, that reproduces the wave characteristics on the ground, and from those determine the FLR frequency. One of the advantages of the new technique is the estimation of physics‐based errors of the FLR frequency, and as a result of the equatorial plasmaspheric mass density. We present analytical results of the new technique, and test it using data from the Inner‐Magnetospheric Array for Geospace Science ground magnetometer chain along the coast of Chile and the east coast of the United States. We compare the results with the results of previously published statistical automated techniques.

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Advances in Plasmaspheric Wave Research with CLUSTER and IMAGE Observations

Cited by 10 publications

References 154 publications

Drivers of chorus in the outer dayside magnetosphere

Drivers of chorus in the outer dayside magnetosphere

Link between EMIC waves in a plasmaspheric plume and a detached sub‐auroral proton arc with observations of Cluster and IMAGE satellites

Nonlinear Least Squares Fitting Technique for the Determination of Field Line Resonance Frequency in Ground Magnetometer Data: Application to Remote Sensing of Plasmaspheric Mass Density

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