Abstract
Electron density is a key physical quantity to characterize any plasma medium. Its measurement is thus essential to understand the physical processes occurring in the environment of a magnetized planet, both macroscopic and microscopic. Since 2000, the four satellites of the European Space Agency (ESA) Cluster mission have been orbiting the Earth from 4 RE to 20 RE and probing the density with several types of instruments. In the magnetotail, this rare combination of experiments is particularly useful since the electron density and the temperature fluctuate over several decades. Two of these experiments, a relaxation sounder and a high-time resolution wide-band receiver, have rarely been flown together in the far tail. Such wave data can be used as a means to estimate the electron density via the identification of triggered resonances or the cutoffs of natural wave emissions, typically with an accuracy of a few percent. For the first time in the magnetotail ( ∼20 RE), the Z-mode is proposed as the theoretical interpretation of the cutoff observed on spectrograms of wave measurements when the plasma frequency is greater than the electron gyrofrequency. We present examples found in the main regions of the magnetotail, comparing simultaneous density estimation from active and passive wave measurements with a particle instrument and calibrated spacecraft-to-probe potential difference data. With these examples, we illustrate the benefit of a multi-instrument approach for the estimation of the electron density in the magnetotail and the care that should be taken when determining the electron density from wave data.
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References
Balogh, A., et al. (2001), The Cluster Magnetic Field Investigation: overview of in-flight performance and initial results, Ann. Geophys., 19, 1207–1217.
Benson, R.F., P.A. Webb, J.L. Green, D.L. Carpenter, V.S. Sonwalkar, H.G. James, and B.W. Reinish (2006), Active wave experiments in space plasmas: the Z mode, Lect. Notes Phys., 687, 3–35.
Calvert, W. (1981), The auroral plasma cavity, Geophys. Res. Lett., 8, 919–921.
Cully, C. M., R. E. Ergun, and A. I. Eriksson (2007), Electrostatic structure around spacecraft in tenuous plasmas, J. Geophys. Res., 112, A09211, doi:10.1029/2007JA012269.
Décréau, P. M. E., Fergeau, P., Krasnosels’kikh, V., Le Guirriec, E., Lévêque, M., Martin, Ph., Randriamboarison, O., Rauch, J. L., Sené, F. X., Séran, H. C., Trotignon, J. G., Canu, P., Cornilleau, N., de Féraudy, H., Alleyne, H., Yearby, K., Mögensen, P. B., Gustafsson, G., André, M., Gurnett, D. A., Darrouzet, F., Lemaire, J., Harvey, C. C., Travnicek, P., and Whisper experimenters (2001), Early results from the Whisper instrument on CLUSTER: an overview, Ann. Geophys., 19, 1241–1258.
Donley, J. L., L.H. Brace, J.A. Findlay, J.H. Hoffman, and G.L. Wrenn (1969), Comparison of results of Explorer 31 direct measurement probes, Proc. IEEE, 5710, 1078–1084.
Escoubet, C. P., A. Pedersen, R. Schmidt, and P.-A. Lindqvist (1997), Density in the magnetosphere inferred from the ISEE-1 spacecraft potential, J. Geophys. Res., 102, 17,595– 17,609, doi:10.1029/97JA00290.
Escoubet, C. P., M. Ferhinger and M. Goldstein (2001), The Cluster mission, Ann. Geophys., 19, 1197–1200.
Etcheto, J. and Bloch, J. J., Plasma density measurements from the GEOS-1 relaxation sounder, Space Sci. Rev., 22, 597–610, 1978.
Etcheto, J., and A. Saint-Marc (1985), Anomalously High Plasma Densities in the Plasmasheet Boundary Layer, J. Geophys. Res., 90, 5338–5344.
Fazakerley, A., S. Schwartz, and G. Paschmann (1998), Measurement of Plasma Velocity Distributions in Analysis Methods for Multi-Spacecraft Data, edited by G. Paschmann and P. W. Daly, ISSI Scientific Report SR-001, ISSI/ESA.
Gurnett, D., and J. Green (1978), On the polarization and origin of auroral kilometric radiation, J. Geophys. Res., 83, 689–696.
Gurnett, D., S. Shawhan, and R. Shaw (1983), Auroral hiss, Z mode radiation, and auroral kilometric radiation in the polar magnetosphere: DE 1 observations, J. Geophys. Res., 88, 329–340.
Gurnett, D. A., R. L. Huff, J. S. Pickett, A. M. Persoon, R. L. Mutel, I.W. Christopher, C. A. Kletzing, U. S. Inan, W. L. Martin, J.-L. Bougeret, H. St. C. Alleyne, and K. H. Yearby, First results from the Cluster wideband plasma wave investigation (2001), Ann. Geophys., 19, 1259–1272.
Gustafsson, G., M. André, T. Carozzi, A. I. Eriksson, C.-G. Fälthammar, R. Grard, G. Holmgren, J. A. Holtet, N. Ivchenko, T. Karlsson, Y. Khotyaintsev, S. Klimov, H. Laakso, P.-A. Lindqvist, B. Lybekk, G. Marklund, F. Mozer, K. Mursula, A. Pedersen, B. Popielawska, S. Saving, K. Stasiewicz, P. Tanskanen, A. Vaivads, and J.-E. Wahlund (2001), First results of electric field and density observations by Cluster EFW based on initial months of operation, Ann. Geophys., 19, 1219–1240.
Harvey, C. C., J. Etcheto, Y. de Javel, R. Manning, and M. Petit, The ISEE electron density experiment, IEEE Trans. Geosci. Electron., GE-16, 231–238, 1978.
Harvey, C. C., J. Etcheto and A. Mangeney (1979), Early results from the ISEE electron density experiment, Space Sci. Rev., 23, 39–58.
Johnstone, A. D., et al. (1997), PEACE, a plasma electron and current experiment, Space Sci. Rev., 79, 351–398, doi:10.1023/A:1004938001388.
Laakso, H., and A. Pedersen (1998), Ambient electron density derived from differential potential measurements, in Measurement Techniques in Space Plasmas: Fields, Geophys. Monogr. Ser., 102, edited by J. Borovsky, R. Pfaff, and D. Young, pp. 73–78, AGU, Washington, DC.
Laakso, H., R. Pfaff, and P. Janhunen (2002), Polar observations of electron density distribution in the Earth’s magnetosphere. Density Profiles, Ann. Geophys., 20, 1725–1735.
Labelle, J. and R. A. Treumann, Auroral radio emissions, hisses roars, and bursts, Space Sci. Rev., 101, 364–440, 2002.
Lefeuvre, F., M. Parrot, J. L. Rauch, B. Poirier, A. Masson, and M. Mogilevsky (1998), Preliminary results from the MEMO multicomponent measurements of waves on-board INTERBALL 2, Ann. Geophys., 16, 1117–1136.
Nagata, D., S. Machida, S. Ohtani, Y. Saito, and T. Mukai, Solar wind control of plasma number density in the near-Earth plasmasheet: three dimensional structure, Ann. Geophys., 26, 4031–4049, 2008.
Nakagawa, T., T. Ishii, K. Tsuruda, H. Hayakawa, and T. Mukai (2000), Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft, Earth Planets Space, 52, 283– 292.
Nykyri, K. and Otto, A. (2001), Plasma Transport at the Magnetospheric Boundary due to Reconnection in Kelvin-Helmholtz Vortices, Geophys. Res. Lett., 28(18), 3565–3568.
Øieroset, M., J. Raeder, T. D. Phan, S. Wing, J. P. McFadden, W. Li, M. Fujimoto, H. Rème, and A. Balogh (2005), Global cooling and densification of the plasmasheet during an extended period of purely northward IMF on October 22–24, 2003, Geophys. Res. Lett., 32(12), L12S07, doi:10.1029/2004GL021523.
Parks, G. K., et al. (1992), Low-Energy particle Layer outside of the plasmasheet boundary, J. Geophys. Res., 97, 2943–2954.
Paschmann, G., A. Fazakerley and S. Schwartz (1998), Moments of Plasma Velocity Distributions in Analysis Methods for Multi-Spacecraft Data, edited by G. Paschmann and P. W. Daly, ISSI Scientific Report SR-001, ISSI/ESA.
Paschmann, G., Quinn, J. M., Torbert, R. B., Vaith, H., McIlwain, C. E., Haerendel, G., Bauer, O. H., Bauer, T., Baumjohann, W., Fillius, W., Förster, M., Frey, S., Georgescu, E., Kerr, S. S., Kletzing, C. A., Matsui, H., Puhl-Quinn, P., and Whipple, E. C.: The Electron Drift Instrument on Cluster: overview of first results, Ann. Geophys., 19, 1273–1288, 2001.
Pedersen, A. (1995), Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements, Ann. Geophys., 13, 118–121, doi:10.1007/s00585-995-0118-8.
Pedersen, A., F. Mozer, and G. Gustafsson (1998), Electric field measurements in a tenuous plasma with spherical double probes, in Measurement Techniques in Space Plasmas: Fields, Geophys. Monogr. Ser., vol. 103, edited by R. F. Pfaff, J. E. Borovsky, and D. T. Young, pp. 1–12, AGU, Washington, DC.
Pedersen, A., P. Décréau, C. P. Escoubet, G. Gustafsson, H. Laakso, P.-A. Lindqvist, B. Lybekk, A. Masson, F. S. Mozer, and A. Vaivads (2001), Four-point high time resolution information on electron densities by the electric field experiment (EFW) on Cluster, Ann. Geophys., 19, 1491–1504.
Pedersen, A., B. Lybekk, M. André, A. Eriksson, A. Masson, F. Mozer, P.-A. Lindqvist, P. M. E. Décréau, I. Dandouras, J.-A. Sauvaud, A. Fazakerley, M. Taylor, G. Paschmann (2008), Electron density estimations derived from spacecraft potential measurements on Cluster in tenuous plasma regions, J. Geophys. Res., 113, A07S33, doi:10.1029/2007JA012636.
Reinisch, B. W., et al. (2001), First results from the radio plasma imager in IMAGE, Geophys. Res. Lett., 28, 1167.
Santolík, O., A. M. Persoon, D. A. Gurnett, P. M. E. Décréau, J. S. Pickett, O. Marsalek, M. Maksimovic, and N. Cornilleau-Wehrlin (2005), Drifting field-aligned density structures in the night-side polar cap, Geophys. Res. Lett., 32, L06106, doi:10.1029/2004GL021696.
Scudder, J. D., X. Cao, and F. Mozer (2000), Photoemission current spacecraft voltage relation: Key to routine quantitative low energy plasma measurements, J. Geophys. Res., 105, 21,281, doi:10.1029/1999JA900423.
Stix, T. H. 1992, Waves in Plasmas, New York, American Institute of Physics.
Svenes, K.R., B. Lybekk, A. Pedersen, and S. Haaland (2008), Cluster observations of near-Earth magnetospheric lobe plasma densities – a statistical study, Ann. Geophys., 26, 2845–2852.
Terasawa, T., Fujimoto, M., Mukai, T., Shinohara, I., Saito, Y., Yamamoto, T., Machida, S., Kokubun, S., Lazarus, A. J., Steinberg, J. T., and Lep**, R. P. (1997), Solar Wind control of density and temperature in the near-Earth plasmasheet: WIND/GEOTAIL collaboration, Geophys. Res. Lett., 24, 935–938.
Thiébault, B., A. Hilgers, A. Masson, C. P. Escoubet, and H. Laakso (2006), Simulation of the Cluster-Spacecraft Floating Probe Potential, IEEE Nucl. Plasma Sci. Soc., 34(5), 2078–2083, doi:10.1109/TPS.2006.883407.
Torkar, K., Riedler, W., Escoubet, C. P., Fehringer, M., Schmidt, R., Grard, R. J. L., Arends, H., Rüdenauer, F., Steiger, W., Narheim, B. T., Svenes, K., Torbert, R., André, M., Fazakerley, A., Goldstein, R., Olsen, R. C., Pedersen, A., Whipple, E., and Zhao, H.: Active spacecraft potential control for Cluster – implementation and first results, Ann. Geophys., 19, 1289–1302,
Trotignon, J. G., Etcheto, J., and J. P. Thouvenin (1986), Automatic determination of the electron density measured by the relaxation sounder on board ISEE-1, J. Geophys. Res., 91, 4302–4320.
Trotignon, J. G., Décréau, P. M. E., Rauch, J. L., Suraud, X., Grimald, S., El-Lemdani Mazouz, F., Vallières, X., Canu, P., Darrouzet, F., Masson, A. (2006), The electron density around the Earth, a high level product of the Cluster/WHISPER relaxation sounder, Cluster and Double Star Symposium, 5th Anniversary of Cluster in Space, held 19–23 September, 2005 in Noordwijk, The Netherlands, edited by K. Fletcher, ESA SP-598, European Space Agency, published on CDROM., p. 70.1.
Acknowledgements
This study has been triggered and discussed within the cross-calibration group of the Cluster Active Archive (CAA) sponsored by the European Space Agency. Ondrej Santolík acknowledges the grant support from GAAV IAA301120601 and NSF 0307319/ME 842.
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Masson, A. et al. (2010). Electron Density Estimation in the Magnetotail: a Multi-Instrument Approach. In: Laakso, H., Taylor, M., Escoubet, C. (eds) The Cluster Active Archive. Astrophysics and Space Science Proceedings. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3499-1_18
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