Ground-satellite coordinated study of the April 5, 1979 events: observation of 0+ cyclotron waves

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B. Inhester
U. Wedeken
A. Korth
S. Perraut
M. Stokholm


In a period of particularly large magnetospheric disturbance, large amplitude pc2 waves were observed in the late dawn sector on GEOS-2 and in the vicinity of the foot-point of the satellite's field line. The waves have dominantly left-hand polarization and their frequency is closely correlated to the O+ gyrofrequency in the magnetosphere. After the start of the pc2 activity, the GEOS-2 particle detectors measured an enhanced flux of energetic O+ ions in the energy range from 0.9-16 keV. By calculating the dispersion of ion cyclotron waves in a multicomponent plasma, it is shown that the energetic O+ ions can destabilize the observed pc2 waves.

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Inhester, B., U. Wedeken, A. Korth, S. Perraut, and M. Stokholm. 1984. “Ground-Satellite Coordinated Study of the April 5, 1979 Events: Observation of 0+ Cyclotron Waves”. Journal of Geophysics 55 (1), 134-41.
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Balsiger, H., Eberhardt, P., Geiss, I., Young, D.T. (1980) Magnetic storm injection of 0.9 to 16 keV/e solar and terrestrial ions into the high altitude magnetosphere. J. Geophys. Res. 85:1645-1662

Bossen, M., McPherron, R.L., Russel, C.T. (1976) Simultaneous pcl observations by synchronous satellite ATS-1 and ground stations: implications concerning IPDP generation mechanisms. J. Atmosph. Terr. Phys. 38:1157-1167

Cornwall, J.M. (1965) Cyclotron instabilities and electromagnetic emission in the ULF and VLF ranges. J. Geophys. Res. 70:61-69

Cornwall, J.M. (1976) Density sensitive instabilities in the magnetosphere. J. Atmosph. Terr. Phys. 18:1111-1114

Cupermann, S. (1981) Electromagnetic kinetic instabilities in multicomponent space plasmas: theoretical predictions and computer simulation experiments. Rev. Geophys. Space Phys. 19:307-343

Fraser, B.J., McPherron, R.L. (1982) Pc 1-2 magnetic pulsation spectra and heavy ion effects at synchronous orbit: ATS-6 results. J. Geophys. Res. 87:4560-4566

Geiss, I., Balsiger, H., Eberhardt, P., Walker, H.P., Weber, L., Young, D.T., Rosenbauer, H. (1978) Dynamics of magnetospheric ion composition as observed by GEOS mass spectrometer. Space Sci. Rev. 22:537-566

Gendrin, R. (1981) General relationships between wave amplification and particle diffusion in a magnetoplasma. Rev. Geophys. Space Phys. 19:171-184

Gendrin, R., Perraut, S., Fargetton, H., Glangeaud, F., Lacoume, J.L. (1978) ULF waves: Conjugated ground satellite relationships. Space Sci. Rev. 22:433-442

Horwitz, J.L., Chappell, C.R., Reasoner, D.L., Craven, P.D., Green, J.L., Baugher, C.R. (1983) Observations of low-energy plasma composition from the ISEE-1 and SCA THA satellites, In: Johnson, R.G. (Ed.) Energetic ion composition in the Earth's magnetosphere. Terra Scientific Publ. Comp., Tokyo

Johnson, R.G., Sharp, R.D., Shelley, E.G. (1977) Observations of ions of ionospheric origin in the storm time ring current. Geophys. Res. Lett. 4:403-406

Korth, A., Kremser, G., Wilken, B. (1978) Observation of substorm associated particle flux variations at 6 < L < 8 with GEOS-1. Space Sci. Rev. 22:501-509

Lanzerotti, L.J., Medford, L.V., Hasegawa, A., Lin, D.L. (1983) Large amplitude ion bounce wave in the magnetosphere near L=3. Geophys. Res. Lett.10:479-481

Lennartsson, W., Sharp, R.D., Shelley, E.G., Johnson, R.G., Balsiger, H. (1981) Ion composition and energy distribution during 10 magnetic storms. J. Geophys. Res. 86:4628-4638

Leubner, M.P. (1983) High-energy tail distributions and resonant wave particle interaction. J. Geophys. Res. 88:469-473

Mauk, B.H. (1983) Frequency gap formation in electromagnetic cyclotron wave distributions. Geophys. Res. Lett. 10:635-638

Mauk, B.H., McPherron, R.L. (1980) An experimental test of the electromagnetic ion cyclotron instability within the Earth's magnetosphere. Phys. Fluids 23:2111-2127

Perraut, S. (1982) Wave particle interaction in the ULF range: GEOS-1 and -2 results. Planet. Space Sci. 30:1219-1227

Perraut, S., Gendrin, R., Robert, P., Roux, A., de Villedary, C., Jones, D. (1978) ULF waves observed with magnetic and electric sensors on GEOS-1. Space Sci. Rev. 22:347-369

Perraut, S., Roux, A., Robert, P., Gendrin, R., Sauvaud, J.-A., Bosqued, J.-M., Kremser, G., Korth, A. (1982) A systematic study of ULF waves above FH+ from GEOS-1 and -2 measurements and their relationships with proton ring distributions. J. Geophys. Res. 87:6219-6236

Perraut, S., Gendrin, R., Roux, A., de Villedary, C. (1984) Ion cyclotron waves: direct comparison between ground based measurements and observations in the source region. J. Geophys. Res. 89:195-202

Rauch, J.L., Roux, A. (1982) Ray tracing of ULF waves in a multicomponent magnetospheric plasma: Consequences for the generation mechanism of ion cyclotron waves. J. Geophys. Res. 87:8191-8198

Roux, A., Perraut, S., Rauch, J.L., de Villedary, C., Kremser, G., Korth, A., Young, D.T. (1982) Wave particle interactions near OmegaHe+ observed on board GEOS-1 and -2, 2. Generation of ion cyclotron waves and heating of the He+ ions. J. Geophys. Res. 87:8174-8190

Shelley, E.G., Sharp, R.D., Johnson, R.G. (1972) Satellite observations of heavy ions during a geomagnetic storm. J. Geophys. Res. 77:6104-6110

Wedeken, U., Inhester, B., Korth, A., Glasmeier, K.H., Gendrin, R., Lanzerotti, L.J., Gough, H., Green, C.A., Amata, E., Pedersen, A., Rostoker, G. (1984) Ground-satellite coordinated study of the April 5, 1979 events: flux variation of energetic particles and associated magnetic pulsations. J. Geophys. 55:120-133

Young, D.T. (1983) Heavy ion plasmas in the outer magnetosphere. J. Geophys. 52:167-175

Young, D.T., Perraut, S., Roux, A., de Villedary, C., Gendrin, R., Korth, A., Kremser, G., Jones, D. (1981) Wave particle interactions near QHe+ observed on GEOS-1 and -2, 1. Propagation of ion cyclotron waves in a He+ rich plasma. J. Geophys. Res. 86:6755-6772