The Search-Coil Magnetometer for MMS

Contel, O. Le; Leroy, Philippe; Roux, A.; Coillot, Christophe; Alison, Dominique; Bouabdellah, Abdel; Mirioni, Laurent; Meslier, L.; Galic, A.; Vassal, M. C.; Torbert, R. B.; Needell, J.; Rau, D.; Dors, I.; Ergun, R. E.; Westfall, J.; Summers, D.; Wallace, John; Magnes, W.; Valavanoglou, A.; Olsson, Göran; Chutter, M.; Macri, J.; Myers, Scott A.; Turco, Simona; Nolin, J.; Bodet, D.; Rowe, K.; Tanguy, M.; Porte, B. de la

doi:10.1007/978-94-024-0861-4_9

Cited by 122 publications

(134 citation statements)

References 69 publications

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“…Magnetic field ( B ) measurements from the Magnetospheric Multiscale (MMS) search‐coil magnetometer (SCM) (Le Contel et al, ) were mainly used to identify and study the properties of LRs. SCM measurements were used only during burst mode operation of the spacecraft when B is sampled at 8,192 Hz.…”

Section: Methodsmentioning

confidence: 99%

Statistical Study of the Properties of Magnetosheath Lion Roars

et al. 2018

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Lion roars are narrowband whistler wave emissions that have been observed in several environments, such as planetary magnetosheaths, the Earth's magnetosphere, the solar wind, downstream of interplanetary shocks, and the cusp region. We present measurements of more than 30,000 such emissions observed by the Magnetospheric Multiscale spacecraft with high-cadence (8,192 samples/s) search coil magnetometer data. A semiautomatic algorithm was used to identify the emissions, and an adaptive interval algorithm in conjunction with minimum variance analysis was used to determine their wave vector. The properties of the waves are determined in both the spacecraft and plasma rest frame. The mean wave normal angle, with respect to the background magnetic field (B 0 ), plasma bulk flow velocity (V b ), and the coplanarity plane (V b ×B 0 ) are 23 ∘ , 56 ∘ , and 0 ∘ , respectively. The average peak frequencies were ∼31% of the electron gyrofrequency ( ce ) observed in the spacecraft frame and ∼18% of ce in the plasma rest frame. In the spacecraft frame, ∼99% of the emissions had a frequency < ce , while 98% had a peak frequency < 0.72 ce in the plasma rest frame. None of the waves had frequencies lower than the lower hybrid frequency, . From the probability density function of the electron plasma e , the ratio between the electron thermal and magnetic pressure, ∼99.6% of the waves were observed with e < 4 with a large narrow peak at 0.07 and two smaller, but wider, peaks at 1.26 and 2.28, while the average value was ∼1.25.

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Section: Methodsmentioning

confidence: 99%

Statistical Study of the Properties of Magnetosheath Lion Roars

et al. 2018

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“…Fluxgate Magnetometer (128 Hz) and Search-Coil Magnetometer (8192 Hz) record the DC and AC magnetic field data respectively (Le Contel et al, 2016;Russell et al, 2016); Electric Double Probes (8192 Hz) provides 3-D electric field data (Ergun et al, 2016;Lindqvist et al, 2016); Fast Plasma Investigation (30 ms for electrons and 150 ms for ions) measures the plasma moments and 3-D particle distribution functions (Pollock et al, 2016). Fluxgate Magnetometer (128 Hz) and Search-Coil Magnetometer (8192 Hz) record the DC and AC magnetic field data respectively (Le Contel et al, 2016;Russell et al, 2016); Electric Double Probes (8192 Hz) provides 3-D electric field data (Ergun et al, 2016;Lindqvist et al, 2016); Fast Plasma Investigation (30 ms for electrons and 150 ms for ions) measures the plasma moments and 3-D particle distribution functions (Pollock et al, 2016).…”

Section: Observationsmentioning

confidence: 99%

Periodical Dipolarization Processes in Earth's Magnetotail

Huang

Jiang

et al. 2019

Geophysical Research Letters

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Using high-resolution data of Magnetospheric Multiscale mission, we observed a gradual but periodical dipolarization process (DPs) in the Earth's magnetotail for the first time. These sub-DPs, characterized by increase of B z component and magnetic magnitude B t , have a period of~16 s. The electrons have a cigar distribution in the first three sub-DPs but have a pancake distribution in the last sub-DP, which excites two oppositely propagating whistler waves. At the trailing boundary of the last sub-DP, B z decreases sharply. Meanwhile, strong tailward and duskward plasma flow, intense current, ion and electron demagnetization, and positive energy conversion from the fields to the plasmas are observed at this boundary. By comparing the motion of this boundary with the plasma flow, we infer that the flow rebounds in longer period of the last DP and causes perpendicular electron acceleration. The periodical sub-DPs and kinetic effects on the DP could improve our understanding of substorm and the magnetotail dynamics.

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“…integrated by using the full distributions are also provided (Pollock et al, ). The Search Coil Magnetometer provides three magnetic components of waves from 1 Hz to 8 kHz (Le Contel et al, ).…”

Section: Instrumentationmentioning

confidence: 99%

Magnetospheric Multiscale Observations of an Ion Diffusion Region With Large Guide Field at the Magnetopause: Current System, Electron Heating, and Plasma Waves

et al. 2018

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We report Magnetospheric Multiscale (MMS) observations of a reconnecting current sheet in the presence of a weak density asymmetry with large guide field at the dayside magnetopause. An ion diffusion region (IDR) was detected associated with this current sheet. Parallel current dominated over the perpendicular current in the IDR, as found in previous studies of component reconnection. Electrons were preferentially heated parallel to the magnetic field within the IDR. The heating was manifested as a flattop distribution below 400 eV. Two types of electromagnetic electron whistler waves were observed within the regions where electrons were heated. One type of whistler wave was associated with nonlinear structures in E|| with amplitudes up to 20 mV/m. The other type was not associated with any structures in E||. Poynting fluxes of these two types of whistler waves were directed away from the X‐line. We suggest that the nonlinear evolution of the oblique whistler waves gave rise to the solitary structures in E||. There was a perpendicular super‐Alfvénic outflow jet that was carried by magnetized electrons. Intense electrostatic lower hybrid drift waves were localized in the current sheet center and were probably driven by the super‐Alfvénic electron jet, the velocity of which was approximately equal to the diamagnetic drift of demagnetized ions. Our observations suggest that the guide field significantly modified the structures (Hall electromagnetic fields and current system) and wave properties in the IDR.

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The Search-Coil Magnetometer for MMS

Cited by 122 publications

References 69 publications

Statistical Study of the Properties of Magnetosheath Lion Roars

Statistical Study of the Properties of Magnetosheath Lion Roars

Periodical Dipolarization Processes in Earth's Magnetotail

Magnetospheric Multiscale Observations of an Ion Diffusion Region With Large Guide Field at the Magnetopause: Current System, Electron Heating, and Plasma Waves

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