Current‐driven plasma instabilities at high latitudes

Earlier Ogo 5 discussions of high-latitude magnetospheric wave-particle interaction phenomena associated with field aligned current systems are extended by considering some September 7, 1968, outbound measurements and corresponding March 11, 1969, observations, when the spacecraft was traversing auroral L shells in midafternoon. It is shown that during moderate magnetospheric disturbances the most intense waves and currents were detected near sharp boundaries in the density of polar cleft electrons, and it is possible that local wave-particle interactions produced anomalous resistivity. Some observed changes in the electron distribution functions might be explained in terms of local acceleration, but significant causal questions about the dynamics remain open if one can use only local data from a single spacecraft in this region.

[1]  A. J. Zmuda,et al.  The diurnal flow pattern of field‐aligned currents , 1974 .

[2]  D. Gurnett.  The Earth as a radio source: Terrestrial kilometric radiation , 1974 .

[3]  D. Evans.  Precipitating electron fluxes formed by a magnetic field aligned potential difference , 1974 .

[4]  K. Papadopoulos,et al.  Anomalous Resistivity in the Auroral Plasma. , 1974 .

[5]  J. Winningham,et al.  Polar cap auroral electron fluxes observed with Isis 1 , 1974 .

[6]  Tetsuya Sato,et al.  Quiet auroral arcs and electrodynamic coupling between the ionosphere and the magnetosphere, 1 , 1973 .

[7]  J. Winningham,et al.  Equatorward shift of the cleft during magnetospheric substorms as observed by Isis 1 , 1973 .

[8]  Tetsuya Sato,et al.  Quiet auroral arcs and electrodynamic coupling between the ionosphere and the magnetosphere, 2 , 1973 .

[9]  C. Russell,et al.  Ion cyclotron waves observed in the polar cusp , 1973 .

[10]  C. Kennel,et al.  Can the ionosphere regulate magnetospheric convection , 1973 .

[11]  C. Russell,et al.  Field-aligned currents, plasma waves, and anomalous resistivity in the disturbed polar cusp. , 1973 .

[12]  C. Russell,et al.  Observation of a current‐driven plasma instability at the outer zone‐plasma sheet boundary , 1973 .

[13]  D. Fairfield.  Magnetic field signatures of substorms on high-latitude field lines in the nighttime magnetosphere , 1973 .

[14]  J. L. Burch,et al.  Precipitation of low‐energy electrons at high latitudes: Effects of interplanetary magnetic field and dipole tilt angle , 1972 .

[15]  J. Winningham,et al.  Auroral emissions and particle precipitation in the noon sector , 1972 .

[16]  L. Frank,et al.  LOCAL-TIME SURVEY OF PLASMA AT LOW ALTITUDES OVER THE AURORAL ZONES. , 1972 .

[17]  C. Kennel,et al.  Polarization of the auroral electrojet , 1972 .

[18]  S. DeForest.  Spacecraft charging at synchronous orbit. , 1972 .

[19]  D. Gurnett,et al.  VLF HISS AND RELATED PLASMA OBSERVATIONS IN THE POLAR MAGNETOSPHERE. , 1972 .

[20]  A. Vampola,et al.  STRONG PITCH-ANGLE SCATTERING OF ENERGETIC ELECTRONS IN THE PRESENCE OF ELECTROSTATIC WAVES ABOVE THE IONOSPHERIC TROUGH REGION. Report for January--June 1971. , 1972 .

[21]  C. Mcilwain,et al.  PLASMA CLOUDS IN THE MAGNETOSPHERE. , 1971 .

[22]  Charles F. Kennel,et al.  Topside current instabilities , 1971 .

[23]  G. Haerendel,et al.  Evidence for magnetic field aligned currents during the substorms of March 18, 1969 , 1971 .

[24]  A. J. Zmuda,et al.  Field‐aligned current at 1100 km in the auroral region measured by satellite , 1970 .

[25]  Christopher T. Russell,et al.  Inward motion of the magnetopause before a substorm , 1970 .

[26]  A. J. Zmuda,et al.  Characteristics of transverse magnetic disturbances observed at 1100 kilometers in the auroral oval , 1970 .

[27]  R. McPherron,et al.  Fluctuations in the Distant Geomagnetic Field During Substorms: Ats 1 , 1970 .