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Hapgood, M. A.; Dimbylow, T.G.; Sutcliffe, Dale C.; Chaizy, P.; FERRON, P. S.; Hill, P. M.; Tiratay, X. Y.

doi:10.1023/a:1004954504114

Cited by 8 publications

(4 citation statements)

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“…The remaining STAFF-SA data is available at the ESA Cluster Active Archive and can be added to the database in the future. Magnetic coordinates (MLT, MLat an L-shell) of the spacecraft and the local values of f ce have been obtained from the Cluster Predicted Magnetic Position catalogues (Hapgood et al, 1997). In order to study waves that may be relevant to the outer radiation belt we only considered those intervals when spacecraft was situated between …”

Section: Cluster Staff-sa Experiments and Data Selectionmentioning

confidence: 99%

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

et al. 2008

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Abstract. Various types of plasma waves have profound effects on acceleration and scattering of radiation belt particles. For the purposes of radiation belt modeling it is necessary to know statistical distributions of plasma wave parameters. This paper analyzes four years of plasma wave observations in the Earth's outer radiation belt obtained by the STAFF-SA experiment on board Cluster spacecraft. Statistical distributions of spectral density of different plasma waves observed in ELF-VLF range (chorus, plasmaspheric hiss, magnetosonic waves) are presented as a function of magnetospheric coordinates and geomagnetic activity indices. Comparison with other spacecraft studies supports some earlier conclusions about the distribution of chorus and hiss waves and helps to remove the long-term controversy regarding the distribution of equatorial magnetosonic waves. This study represents a step towards the development of multi-spacecraft database of plasma wave activity in radiation belts.

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Section: Cluster Staff-sa Experiments and Data Selectionmentioning

confidence: 99%

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

et al. 2008

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“…Thus, the instrument routinely returns pitch angle distributions and velocity space moments that are produced by onboard algorithms. Periods of burst mode telemetry are possible, during which 3-D distributions may also be telemetered to the ground, and are generally scheduled for short intervals (a few hours) around the expected encounter with a target boundary crossing such as the tail neutral sheet (Hapgood et al, 1997).…”

Section: Instrumentation and Datamentioning

confidence: 99%

Thinning and expansion of the substorm plasma sheet: Cluster PEACE timing analysis

et al. 2004

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Abstract. The storage and subsequent removal of magnetic flux in the magnetotail during a geomagnetic substorm has a dramatic effect on the thickness of the cross-tail plasma sheet. The near-Earth plasma sheet is thought to thin during the growth phase and then rapidly expand after onset of the substorm. The direction of propagation, whether earthward or tailward along the GSM-X direction in the near-Earth tail, may suggest the time ordering of current-disruption and near-Earth reconnection, both of which are key to the substorm process. Cluster's Plasma Electron And Current Experiment (PEACE) allows 4-point observations of electrons at the plasma sheet -lobe boundary as this interface passes over the Cluster tetrahedron. The relative timings of the boundary passage at each spacecraft allow a determination of this boundary's speed and direction of motion, assuming this is planar on the scale of the Cluster separation scale. For those boundaries corresponding to the expansion of the plasma sheet, this direction is fundamental to determining the direction of expansion. We present an example of isolated thinning and expansion of the plasma sheet, as well as a multiple thinning-expansion event that occurs during a more active substorm. Data from the 2001 and 2002 tail passes have been analysed and the average plasma sheet -lobe boundary normal vectors and normal component velocities have been calculated. A total of 77 crossings, typically between 10 and 20 R E downtail, correspond to substorm associated expansion of the plasma sheet over the spacecraft. These had normal vectors predominantly in the GSM-YZ plane and provided no clear evidence for the formation of the near-Earth neutral line occurring before current disruption or vice versa. The expansions of the plasma sheet generally exhibit the appropriate GSM-Z direction expected for the given lobe, and tend to have GSM-Y components that support onset occurring near the origin of the GSM-YZ plane. This result is noteworthy in that it indicates a homogeneous plasma sheet expansion. These expansions have an average velocity along their normal of 60±37 km s −1 . Conversely we find an average thinning velocity of 43±32 km s −1 from 66 substormCorrespondence to: J. P. Dewhurst (jpd@mssl.ucl.ac.uk) associated thinnings. The normal vectors of the thinning plasma sheet vary considerably in the GSM-YZ plane across the entire magnetotail, suggesting that more complex dynamics govern this process.

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“…The Maglib was developed for the treatment of data from the Interball and Cluster spacecraft (Hapgood et al, 2004). At the same time, Prokhorenko (1995) introduced this parameter at IKI (Cosmic Research Institute, Moscow), for the French-Russian planning of the Interball experiments.…”

Section: Improved the Methods By Tracing The Field Line Downmentioning

confidence: 99%

Quantitative aspects of the Galperin <i>L</i> parameter

Kosik¹

2007

Ann. Geophys.

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Abstract.A new geomagnetic parameter was suggested twenty years ago by Y. Galperin, the Galperin L parameter, and it was introduced into the CNES Maglib for FrenchRussian projects in the exploration of the distant magnetosphere. The definition and the advantages of the Galperin L parameter are recalled in this brief paper. Unforeseen possibilities in the use of this parameter for mathematical models of the magnetosphere are stressed using past results obtained with the Mead model. The Galperin L parameter is shown to add, in the synchronous region, a quantitative capability to the qualitative description (labelling) of the magnetosphere. More work will be necessary to adapt past mathematical models to present numerical models and extend the domain of the quantitative applications of the Galperin L parameter.

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Cited by 8 publications

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Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Thinning and expansion of the substorm plasma sheet: Cluster PEACE timing analysis

Quantitative aspects of the Galperin <i>L</i> parameter

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Untitled

Cited by 8 publications

References 0 publications

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Thinning and expansion of the substorm plasma sheet: Cluster PEACE timing analysis

Quantitative aspects of the Galperin &lt;i&gt;L&lt;/i&gt; parameter

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Quantitative aspects of the Galperin <i>L</i> parameter