Measurements of Quasi-Static and Low-Frequency Electric Fields with Spherical Double Probes on the ISEE-1 Spacecraft

Mozer, F. S.; Torbert, R. B.; Fahleson, U.; Fälthammar, Carl‐Gunne; Gonfalone, A.; Pedersen, Å.

doi:10.1109/tge.1978.294558

Cited by 80 publications

(46 citation statements)

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“…Then in section 3 we discuss the definition of the magnetopause. In sections 4 and 5, we show two-dimensional (2-D) and three-dimensional ( [Russell, 1978], the electric field [Mozer et al, 1978] and IMF and solar wind conditions for this crossing have been reported by Song et al [1990]. Electron data are from the Vector Electron Spectrometer (VES) [Ogilvie et al, 1978].…”

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confidence: 80%

Structure and properties of the subsolar magnetopause for northward interplanetary magnetic field: Multiple‐instrument particle observations

et al. 1993

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The structure and properties of the subsolar magnetopause for northward interplanetary magnetic feild (IMF) are studied with measurements from 10 different instruments for three ISEE crossings. Data show that the overall structure and properties are similar for the three crossings, indicating the magnetopause is relatively well determined in the subsolar region for strongly northward IMF. The measurements from different instruments are consistent with each other and complementary based on the current knowledge of space plasma physics. The combined data set suggests that the magnetopause region is best organized by defining a sheath transition layer and steplike boundary layers. The sheath transition layer contains mostly magnetosheath particles. The magnetosheath, magnetospheric, and ionospheric populations are mixed in the interior boundary layers. This result, which is consistent with previous studies, is now supported by observations of a much broader spectrum of measurements including three-dimensional electron, energetic particle, heavy ion and plasma wave. Some new features are also found: even for quiet subsolar magnetopause crossings, transient or small-scale structures still occur sporadically; slight heating may occur in the boundary layers. Some outstanding issues are clarified by this study: the electron flux enhancements in the lowest energies in the boundary layers and magnetosphere are ionospheric electrons and not photoelectrons from the spacecraft; for northward IMF, they are photoelectrons, but for southward IMF they may be secondary electrons; and the density measurements from differential and integral techniques are similar, leaving no room for a significant "invisible" population. •rrRODUCTIONThe magnetopause at the subsolar point for strongly northward interplanetary magnetic field (IMF) is an interface between two magnetized plasmas with nearly parallel magnetic fields and without a significant relative motion. Although in MHD theory this interface can be treated mathematically as an infinitely thin separatrix which separates two distinct solutions [e.g., Crooker, 1985], the magnetic field and plasma change over a finite interval and not necessarily coincidently. The field transition occurs in current layers and the particle transition can be abrupt over gyroradius or less scales or occur in a broader region called a boundary layer. Previous theoretical investigations [Ferraro, 1952;Parker, 1967;Sestero, 1966; Alpers, 1969; Lee and Kan, 1979; Whipple et al., 1984] considered the situation when these two transitions are coincident and thin. Observations of the lowlatitude boundary layer (LLBL), which is a layer filled with magnetosheath particles but occurring on the magnetospheric side Paper number 93JA00606. 0148-0227/93/93 JA-0(O0005.00 of the magnetopause current layer [Hones et al., 1972; Easttnan et al., 1976; al Haerendel et. al., 1978; Paschmann, 1979; Sckopke et al., 1981; Mitchell et al., 1987], suggest that the particle transition is not always coincident with the field transition...

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confidence: 80%

Structure and properties of the subsolar magnetopause for northward interplanetary magnetic field: Multiple‐instrument particle observations

et al. 1993

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“…ISEE 1 and 2 magnetic field data are from identical fluxgate magnetometers described by Russell [1978]. The electric field data are from the spherical double probe experiment [ Mozer et al , 1978]. The spacecraft were launched on 22 October 1977.…”

Section: Satellite Data Analysismentioning

confidence: 99%

Detection of ultralow‐frequency cavity modes using spacecraft data

et al. 2002

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[1] The cold, magnetized plasma in the Earth's magnetosphere supports two ultralowfrequency plasma wave modes. Both these modes may exhibit resonant oscillations in the magnetosphere cavity. Theoretical and numerical studies have predicted the existence of cavity/waveguide resonance modes, yet experimental evidence is sparse. In this paper we detail the expected structure of these modes using both one dimensional (1-D) and three-dimensional (3-D) magnetohydrodynamic (MHD) numerical models. The cavity/ waveguide mode structures are examined in order to develop experimental detection methods suitable for spacecraft electric and magnetic field perturbation data. Cavity mode resonances in the 1-D model suggest a detection method based on wave polarization using the radial (b x ) and field-aligned (b z ) magnetic perturbations. However, when implemented, this method failed to identify cavity/waveguide modes in the magnetic field data recorded by Active Magnetospheric Particle Tracer Explorers/CCE for events that showed pronounced field line resonances in the azimuthal (b y ) channel. An examination of data from a 3-D MHD numerical simulation showed that the cavity/waveguide resonant signature was identified best in b z component data. Consequently, a wave mode detection method using the b z data from two spatially separated satellites is discussed.

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“…These instruments include the Medium Energy Particle Instrument (MEPI) for energetic ions [Williams et al, 1978]; the Low Energy Proton and Electron Differential Energy Analyzer (LEPEDEA) for plasma ions and electrons [Frank et al, 1978]; the quasi-static electric field experiment [Mozer et al, 1978]; and the flux gate magnetometer [Russell, 1978]. As is typical for observations of quiet time pulsations, charged particles from 10 eV to 200 keV appear to exhibit a passive response to the pulsation disturbance for most of the period studied.…”

Section: Introductionmentioning

confidence: 99%

Pc 5 pulsations in the outer dawn magnetosphere seen by ISEE 1 and 2

et al. 1990

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A long‐lasting Pc 5 pulsation at the dawn flank of the magnetosphere is studied using particle and field instrumentation from the ISEE 1 and 2 satellites. Electric field and particle modulation signatures were clearer than magnetic field variations, consistent with the satellites' position in latitude near the equatorial node of a fundamental resonance. Pulsation flow velocities along the ISEE 1 trajectory were calculated from particle characteristics using data from several instruments and from electric and magnetic field data. These flow velocities were all consistent with each other, but the velocities derived from plasma and energetic particle observations were a factor of 2.5 larger than velocities derived from the fields data. We have not been able to find the source of this discrepancy; one possibility is that the field near the spacecraft differs from the large‐scale field. In contrast to observations of pulsations during magnetic storms, which often involve resonant or gyrating particle behavior, particles at all energies sampled (10 eV to 200 keV) appeared to respond passively to the pulsation throughout most of the period of interest. Comparison of data from the two spacecraft, which traveled from ∼15 RE to ∼7 RE with a time separation of ∼1 hour, suggests the propagation of relatively broadband pulsation energy from the magnetopause/low latitude boundary layer and subsequent resonance of independent L shells in the fundamental toroidal mode after the cessation of power input.

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Measurements of Quasi-Static and Low-Frequency Electric Fields with Spherical Double Probes on the ISEE-1 Spacecraft

Cited by 80 publications

References 0 publications

Structure and properties of the subsolar magnetopause for northward interplanetary magnetic field: Multiple‐instrument particle observations

Structure and properties of the subsolar magnetopause for northward interplanetary magnetic field: Multiple‐instrument particle observations

Detection of ultralow‐frequency cavity modes using spacecraft data

Pc 5 pulsations in the outer dawn magnetosphere seen by ISEE 1 and 2

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