First measurements of electron vorticity in the foreshock and solar wind

Gurgiolo, C.; Goldstein, M. L.; Viñas, A. F.; Fazakerley, A. N.

doi:10.5194/angeo-28-2187-2010

Cited by 10 publications

(16 citation statements)

References 23 publications

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“…The numerical method used to estimate the electron moments and algorithm used to compute the spatial derivatives of the fluid velocity have been covered in detail in Gurgiolo et al (2010). That paper also includes discussions on possible sources of error and limitations associated with the results of the computations -we refer the reader there for details.…”

Section: Moments and Spatial Derivativesmentioning

confidence: 99%

“…One problem not addressed in Gurgiolo et al (2010) because it did not present a major concern in the solar wind upstream of the magnetosphere is the effect of the Active Spacecraft Potential Control experiment (ASPOC). ASPOC uses an ion emitter to reduce the spacecraft potential.…”

Section: Moments and Spatial Derivativesmentioning

confidence: 99%

“…Using the technique reported in Gurgiolo et al (2010), we have looked for evidence of vorticity in several tail crossings. These crossings include three time periods from two crossings during which Eastwood et al (2010) report that the Cluster spacecraft found signatures of passing through the ion diffusion region of an x-line reconnection event.…”

Section: Introductionmentioning

confidence: 99%

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Observations of electron vorticity in the inner plasma sheet

Gurgiolo¹,

Goldstein

Viñas

et al. 2011

Ann. Geophys.

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Abstract. From a limited number of observations it appears that vorticity is a common feature in the inner plasma sheet. With the four Cluster spacecraft and the four PEACE instruments positioned in a tetrahedral configuration, for the first time it is possible to directly estimate the electron fluid vorticity in a space plasma. We show examples of electron fluid vorticity from multiple plasma sheet crossings. These include three time periods when Cluster passed through a reconnection ion diffusion region. Enhancements in vorticity are seen in association with each crossing of the ion diffusion region.

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Section: Moments and Spatial Derivativesmentioning

confidence: 99%

Section: Moments and Spatial Derivativesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observations of electron vorticity in the inner plasma sheet

Gurgiolo¹,

Goldstein

Viñas

et al. 2011

Ann. Geophys.

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“…This general 'curlometer' technique has also been used to study, for example, mirror mode structures (Lucek et al 2001). Detailed discussions of the procedure as applied to currents and vorticity can be found in Chanteur (1998) and Gurgiolo et al (2010Gurgiolo et al ( , 2011.…”

Section: Spatial Derivativesmentioning

confidence: 99%

Multipoint observations of plasma phenomena made in space by Cluster

et al. 2015

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Plasmas are ubiquitous in nature, surround our local geospace environment, and permeate the universe. Plasma phenomena in space give rise to energetic particles, the aurora, solar flares and coronal mass ejections, as well as many energetic phenomena in interstellar space. Although plasmas can be studied in laboratory settings, it is often difficult, if not impossible, to replicate the conditions (density, temperature, magnetic and electric fields, etc.) of space. Single-point space missions too numerous to list have described many properties of near-Earth and heliospheric plasmas as measured both in situ and remotely (see http://www.nasa.gov/missions/#.U1mcVmeweRY for a list of NASA-related missions). However, a full description of our plasma environment requires three-dimensional spatial measurements. Cluster is the first, and until data begin flowing from the Magnetospheric Multiscale Mission (MMS), the only mission designed to describe the three-dimensional spatial structure of plasma phenomena in geospace. In this paper, we concentrate on some of the many plasma phenomena that have been studied using data from Cluster. To date, there have been more than 2000 refereed papers published using Cluster data but in this paper we will, of necessity, refer to only a small fraction of the published work. We have focused on a few basic plasma phenomena, but, for example, have not dealt with most of the vast body of work describing dynamical phenomena in Earth's magnetosphere, including the dynamics of current sheets in Earth's magnetotail and the morphology of the dayside high latitude cusp. Several review articles and special publications are available that describe aspects of that research in detail and interested readers are referred to them (see for example, Escoubet et al.

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“…The numerical method used to estimate the electron moments has been presented in detail in Gurgiolo et al (2010), and we refer interested readers to that publication. It should be noted that to ensure that the moments derived on each spacecraft cover the same energy range for the entire time interval analyzed, the lower energy limits used in the integrals are set to the highest lower energy measurable after correcting for the spacecraft potential, while the lower velocity limit is set to the minimum upper energy measured on the four spacecraft.…”

Section: Momentsmentioning

confidence: 99%

Characteristics of the Taylor microscale in the solar wind/foreshock: magnetic field and electron velocity measurements

Gurgiolo¹,

Goldstein

Matthaeus

et al. 2013

Ann. Geophys.

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Abstract. The Taylor microscale is one of the fundamental turbulence scales. Not easily estimated in the interplanetary medium employing single spacecraft data, it has generally been studied through two point correlations. In this paper we present an alternative, albeit mathematically equivalent, method for estimating the Taylor microscale (λ T ). We make two independent determinations employing multi-spacecraft data sets from the Cluster mission, one using magnetic field data and a second using electron velocity data. Our results using the magnetic field data set yields a scale length of 1538 ± 550 km, slightly less than, but within the same range as, values found in previous magnetic-field-based studies. During time periods where both magnetic field and electron velocity data can be used, the two values can be compared. Relative comparisons show λ T computed from the velocity is often significantly smaller than that from the magnetic field data. Due to a lack of events where both measurements are available, the absolute λ T based on the electron fluid velocity is not able to be determined.

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First measurements of electron vorticity in the foreshock and solar wind

Cited by 10 publications

References 23 publications

Observations of electron vorticity in the inner plasma sheet

Observations of electron vorticity in the inner plasma sheet

Multipoint observations of plasma phenomena made in space by Cluster

Characteristics of the Taylor microscale in the solar wind/foreshock: magnetic field and electron velocity measurements

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