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Ulysses HISCALE Pages

Ulysses HISCALE AGU Abstracts, 1991-1994

1994

T. P. Armstrong and Moncef Boufaida, The Propagation and Sources of 0.5 to 2.0 MeV Protons in the 1 to 5 AU In-Ecliptic Region, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 534, 1994.

We have used observations of 0.5 to 2 MeV proton fluxes in 4 passbands during the 1.0 to 5.0 AU traversals of Voyager 1 and 2 and Ulysses to compare with fluxes measured simultaneously in matched passbands on IMP 8 during 1997-78 (Voyagers 1 and 2) and 1990-91 (Ulysses). The results suggest that the interplanetary fluxes at several MeV arise primarily from sources within 1 AU and that the lower energies are most strongly affected by interplanetary processes beyond 1 AU. The source within 1 AU is most likely solar and well-correlated with solar flares, while the process acting beyond 1 AU appears to be the acceleration of the lower energy protons by interplanetary shocks. For the lower energy protons, the spatial gradient is positive (higher intensity beyond 1 AU) and for the higher energy protons, the spatial gradient is generally negative (higher intensity within 1 AU). The statistical coherence of daily averaged fluxes at 1 AU and beyond 1 AU also shows that the higher energy protons are more strongly controlled by processes acting within 1 AU than are the lower energy protons. The implications of these results for models of particle transport in the diffusion-convection-adiabatic deceleration model will be discussed.

S. M. Ashford, K. A. Anderson, R. P. Lin, J. R. Sommers, and J. L. Phillips, Solar Particle Drop-outs at 1.63 AU--Solar Wind Structures or Earth's Magnetotail?, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 557, 1994.

A. F. Cheng, S. E. Hawkins, L. J. Lanzerotti, and C. G. Maclennan, Rotation of Jupiter's Magnetosphere: New Results from Ulysses, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 310, 1994.

The Ulysses flyby of Jupiter in February 1992 sent the spacecraft through a previously unexplored region of the magnetosphere, near dusk local time and at high magnetic latitude during the outbound pass. Previous analyses of Ulysses data using particle anisotropies from the HISCALE, COSPIN and EPAC experiments have demonstrated that during the inbound pass the magnetosphere was in a state of partial corotation. Ulysses inbound sampled a region of the magnetosphere that roughly overlapped the region sampled by previous spacecraft encounters with Jupiter, and the Ulysses results are qualitatively consistent with Voyager results. However, for the Ulysses outbound pass through previously unexplored territory, the HISCALE team has reported a surprising result, that the dominant particle anisotropy signature arose from field- and anti-field-aligned streaming of both ions and electrons. We have undertaken an analysis to resolve the question of whether there is any evidence of corotation in the Ulysses outbound data. The outbound Ulysses particle anisotropies do indicate that the duskside, high latitude magnetosphere is in partial corotation with Jupiter. However, there is a suggestion that the rotation rate is less for the outbound pass than for a comparable radial range inbound. If confirmed in further analyses, this would indicate a complicated system of differential rotation for Jupiter's magnetosphere.

G. Gloeckler, F. M. Ipavich, E. C. Roelof, J. Geiss, R. von Steiger, L. A. Fisk, K. W. Ogilvie, L. J. Lanzerotti, and B. Wilken, Acceleration of Pickup Ions in the Disturbed Solar Wind Observed with Ulysses, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 296, 1994.

L. J. Lanzerotti, C. G. Maclennan, G. M. Simnett, E. C. Roelof, T. P. Armstrong, R. E. Gold, S. M. Krimigis, E. T. Sarris, K. A. Anderson, M. Pick, and R. P. Lin, Measurement of the Heliolatitude Dependence of Anomalous Cosmic Ray Oxygen, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 294, 1994.

L. J. Lanzerotti, R. E. Gold, K. A. Anderson, T. P. Armstrong, S. M. Krimigis, R. P. Lin, M. Pick, E. C. Roelof, E. T. Sarris, G. M. Simnett, and C. G. Maclennan, Studies of Low Energy Particles in the High Latitude Heliosphere (invited), Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 513, 1994.

L. J. Lanzerotti, C. G. Maclennan, R. E. Gold, E. C. Roelof, G. M. Simnett, T. P. Armstrong, S. M. Krimigis, E. T. Sarris, K. A. Anderson, M. Pick, and R. P. Lin, Studies of the Anomalous Cosmic Ray Oxygen Component as a Function of Heliolatitude, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 516, 1994.

R. J. MacDowall, M. D. Desch, W. M. Farrell, M. L. Kaiser, R. G. Stone, L. J. Lanzerotti, C. G. Maclennan, J. A. Simpson, R. B. McKibben, and M. Zhang, Relative Occurrence Times of Jovian Quasiperiodic Radio Bursts and Impulsive Electron Streaming Events, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 318, 1994.

C. G. Maclennan and L. J. Lanzerotti, Elemental Abundances in Co-rotating Interaction Regions at High Solar Latitudes, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 295, 1994.

K. W. Ogilvie, E. C. Roelof, G. Gloeckler, and D. B. Berdichevsky, Proton Phase-Space Densities (5 keV<Ep<5 MeV) at Mid-Heliolatitudes from Ulysses SWICS/HI-SCALE Measurements, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 260, 1994.

R. Prange, M. K. Dougherty, M. Dunlop, C. Rastoin, M. Hammond, L. J. Lanzerotti, and C. G. Maclennan, In-situ Study and Remote Sensing of a High Latitude Jovian Aurora with Simultaneous HST Observations and Ulysses Measurements, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 219, 1994.

E. C. Roelof, G. M. Simnett, and T. P. Armstrong, IMF Connection for Solar Energetic Protons Observed at Ulysses via Recurrent Mid-Latitude Solar Wind Rarefaction Regions, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 295, 1994.

E. C. Roelof, K. W. Ogilvie, and G. Gloeckler, Phase Space Densities, Energetic Ions, Pickup Protons, Specific Entropy, and Stream Interfaces: Ulysses Beyond 25 South, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 513, 1994.

G. M. Simnett, E. C. Roelof, and L. J. Lanzerotti, Evidence for Acceleration of Electrons and Protons by Recurrent Reverse Shocks Observed by Ulysses at Mid-Heliolatitudes 5.3-3.8 AU, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 294, 1994.

G. M. Simnett, S. J. Tappin, E. C. Roelof, L. J. Lanzerotti, T. P. Armstrong, R. E. Gold, S. M. Krimigis, K. A. Anderson, R. P. Lin, M. Pick, and E. T. Sarris, Detection of a Relativistic Electron Increase at High Heliographic Latitude, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 513, 1994. Abstract:

D. J. Thomson, L. J. Lanzerotti, and C. G. Maclennan, Possible Low-Frequency Solar Modes Observed by Ulysses, Spring AGU Meeting, May 1994, 1994 Spring Meeting Supplement to EOS, 265, 1994.

D. J. Thomson, L. J. Lanzerotti, and C. G. Maclennan, Solar Modes Observed by Ulysses, Fall AGU Meeting, December 1994, 1994 Fall Meeting Supplement to EOS, 516, 1994.

1993

K. A. Anderson, J. Sommers, R. P. Lin, M. Pick, P. Chaizy, N. Murphy, E. J. Smith, and J. L. Phillips, Propagation of Solar Energetic Particles in Discrete Solar Plasma-Interplanetary Magnetic Field Structures, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 479, 1993.

T. P. Armstrong, D. Haggerty, L. J. Lanzerotti, C. Maclennan, R. Forsyth, A. Balogh, E. Roelof, R. Gold, and S. M. Krimigis, Observation at Ulysses of a Spectrally-Peaked, Magnetic-Field-Aligned, 0.1 to 1 MeV Ion Event at 4.6 AU and 36o South Heliographic Latitude, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 480, 1993.

M. Boufaida and T. P. Armstrong, Variations in the Intensities and Energy Spectra of 0.3 to 5 MeV Protons in the 1 to 5 AU Region Observed With Voyager 1 and 2, Ulysses, and IMP 8, Spring AGU Meeting, May 1993, 1993 Spring Meeting Supplement to EOS, 240, 1993. Outline:

H. D. Brent, C. G. Maclennan, L. J. Lanzerotti, and R. J. Forsyth, Interplanetary Magnetic Field Control of Heavy Ion Abundances at ~5.2 AU, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 482, 1993.

D. M. Feldman, C. G. Maclennan, and L. J. Lanzerotti, Ulysses Measurements of Energetic H3 Molecules in Jupiter's Magnetosphere, Spring AGU Meeting, May 1993, 1993 Spring Meeting Supplement to EOS, 257, 1993.

D. Haggerty, J. Buckley, and T. P. Armstrong, Observations of Spatial Structure and Angular Distributions in Interplanetary Ion Bursts of Presumed Jovian Origin Measured with the Ulysses HISCALE Experiment, Spring AGU Meeting, May 1993, 1993 Spring Meeting Supplement to EOS, 239, 1993. Abstract:

L. J. Lanzerotti, T. P. Armstrong, C. G. Maclennan, G. M. Simnett, A. F. Cheng, R. E. Gold, D. J. Thomson, K. A. Anderson, S. E. Hawkins III, S. M. Krimigis, M. Pick, E. C. Roelof, E. T. Sarris, and S. J. Tappin, Overview of Selected Hot Plasma Measurements at Jupiter by the HI-SCALE Instrument on Ulysses, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 512, 1993.

C. G. Maclennan and L .J. Lanzerotti, Heavy Ion Composition Variations Out of the Ecliptic Plane During 7 Solar Rotations in 1993, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 481, 1993.

C. G. Maclennan, L. J. Lanzerotti, R. E. Gold, and S. E. Hawkins III, Hiscale Observations of Nuclear Abundances in Recurrent Energetic Particle Events: The Ulysses Mission 1-5 AU, Spring AGU Meeting, May 1993, 1993 Spring Meeting Supplement to EOS, 239, 1993.

E. C. Roelof, G. M. Simnett, T. P. Armstrong, and L. J. Lanzerotti, Low-Energy Ion and Electron Events at Ulysses Beyond 5 AU and at IMP8 Near Earth, Spring AGU Meeting, May 1993, 1993 Spring Meeting Supplement to EOS, 239, 1993.

E. C. Roelof, T. P. Armstrong, G. M. Simnett, and L. J. Lanzerotti, Implications of Energetic Particle Streaming (60 keV-5 MeV) Near 5 AU Observed by Ulysses, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 482, 1993.

G. M. Simnett, K. A. Sayle, and S. J. Tappin, Co-rotating Ion and Electron Enhancements at ~5 AU, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 479, 1993.

J. Sommers, K. A. Anderson, R. P. Lin, N. Murphy, E. J. Smith, and J. L. Philips, Square-Wave Solar Energetic Particle Intensity Fluctuations in the Interplanetary Medium, Fall AGU Meeting, December 1993, 1993 Fall Meeting Supplement to EOS, 479, 1993.

1992

K. A. Anderson, P. Chaizy, R. P. Lin, and J. Sommers, Channeled Non-Relativistic Electrons Detected From 10-15 December 1990 by the Ulysses Spacecraft, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 238, 1992.

T. P. Armstrong, T. H. Choo, G. Ye, E. Sarris, L. J. Lanzerotti, S. M. Krimigis, and P. Chaizy, Ulysses and Voyager Observations of Energetic Electrons and Ions in the Outer Jovian Magnetosphere, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 181, 1992.

A. F. Cheng, R. E. Gold, S. M. Krimigis, E. C. Roelof, L. J. Lanzerotti, and E. T. Sarris, Implications of Ulysses Observations for Jovian Magnetospheric Models, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 175, 1992.

The Ulysses Jupiter encounter includes the first spacecraft pass through the dusk magnetosphere and allows new tests of Jovian plasma convection and corotation models. Among the issues to be addressed are the following. Hot plasma flow in the corotational direction is observed in the dayside magnetosphere. However, in the dusk magnetosphere high latitude pass, clear evidence is observed for a magnetospheric configuration dominated by solar wind interaction, including field-aligned currents. Predictions of a particular global plasma convection model (Cheng, Geophys. Res. Lett., 19, 221, 1992) will be re-examined in the light of Ulysses encounter results. Implications will also be discussed for other plasma convection models, such as planetary wind models, and for our understanding of solar wind-magnetosphere-ionosphere coupling at Jupiter.

S. M. Krimigis, E. C. Roelof, E. T. Sarris, K. A. Anderson, G. M. Simnett, L. J. Lanzerotti, and A. Balogh, Energetic Ion Events Upstream and Downstream of Jupiter Observed by Ulysses, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 181, 1992.

L. J. Lanzerotti, R. E. Gold, K. A. Anderson, T. P. Armstrong, R. P. Lin, S. M. Krimigis, M. Pick, E. C. Roelof, E. T. Sarris, and G. M. Simnett, Hot Plasma (Ion and Electron) Measurements at Jupiter with the Ulysses HI-SCALE Instrument, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 174, 1992.

C. G. Maclennan, L. J. Lanzerotti, R. E. Gold, S. E. Hawkins III, and S. J. Tappin, Measurements of Low Energy Atomic Abundance in Jupiter's Magnetosphere From Ulysses, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 181, 1992.

E. T. Sarris, T. P. Armstrong, R. E. Gold, S. M. Krimigis, E. C. Roelof, L. J. Lanzerotti, and R. Forsyth, Bursts of Energetic Particles Inside Jupiter's Magnetosphere, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 181, 1992.

J. H. Waite, Jr., G. Ye, T. P. Armstrong, and T. E. Cravens, Energetic Electron and Ion Inputs to the Jovian Aurora as Observed with the Ulysses HISCALE Experiment, Spring AGU Meeting, May 1992, 1992 Spring Meeting Supplement to EOS, 176, 1992.

1991

P. Chaizy, K. A. Anderson, R. P. Lin, J. Sommers, L. J. Lanzerotti, R. E. Gold, S. M. Krimigis, E. C. Roelof, T. P. Armstrong, M. Pick, E. T. Sarris, and G. M. Simnett, A Solar Energetic Electron Event with Dispersionless Onset Detected by the HI-SCALE Experiment on the Ulysses Spacecraft, Fall AGU Meeting, December 1991, AGU 1991 Fall Meeting Program and Abstracts Supplement to EOS, 386, 1991.

R. E. Gold, L. J. Lanzerotti, K. A. Anderson, T. P. Armstrong, R. P. Lin, S. M. Krimigis, M. Pick, E. C. Roelof, E. T. Sarris, G. M. Simnett, and W. E. Frain, Low Energy Ion and Electron Measurements Beyond 2 AU on the Ulysses Spacecraft, Spring AGU Meeting, May 1991, EOS Spring Meeting 1991 Abstract Volume, 217, 1991.

The Heliosphere Instrument for Spectral, Composition, and Anisotropy at Low Energies (HISCALE) is designed to make measurements of interplanetary ions and electrons throughout the Ulysses mission. The ions (E ≥ 50 keV) and electrons (E ≥ 30 keV) are identified and detected by five separate solid-state detector telescopes that are oriented to provide essentially complete pitch angle coverage from the spinning spacecraft. Ion elemental abundances are determined by a  ΔE vs. E telescope using a thin (5 μm) front detector element in a three-element telescope. Initial results will be presented on measurements of low energy interplanetary particles beyond 2 AU. Special attention is given to examinations of shock-acceleration processes and effects and composition of solar particle events.

R. Gold, S. M. Krimigis, E. C. Roelof, L. J. Lanzerotti, T. P. Armstrong, G. M. Simnett, K. A. Anderson, R. P. Lin, M. Pick, and E. T. Sarris, Ulysses/IMP-8 Low Energy Ion and Electron Measurements (March 21 - April 9, 1991), Fall AGU Meeting, December 1991, AGU 1991 Fall Meeting Program and Abstracts Supplement to EOS, 379, 1991.

L. J. Lanzerotti, C. G. Maclennan, R. E. Gold, S. E. Hawkins III, E. C. Roelof, G. M. Simnett, K. A. Anderson, T. P. Armstrong, R. P. Lin, S. M. Krimigis, M. Pick, and E. T. Sarris, Low Energy Ion and Electron Measurements of the March-April 1991 Solar Events by Ulysses, Fall AGU Meeting, December 1991, AGU 1991 Fall Meeting Program and Abstracts Supplement to EOS, 386, 1991.

J. Sommers, K. A. Anderson, P. Chaizy, R. P. Lin, L. J. Lanzerotti, R. E. Gold, S. M. Krimigis, E. C. Roelof, T. P. Armstrong, M. Pick, E. T. Sarris, and G. M. Simnett, Solar Energetic Electron Events Observed by the HI-SCALE Experiment on the Ulysses Spacecraft, Fall AGU Meeting, December 1991, AGU 1991 Fall Meeting Program and Abstracts Supplement to EOS, 386, 1991.

The HISCALE experiment on the Ulysses spacecraft detected at least six impulsive solar non-relativistic (>30 keV) electron events between December 11 and 15, 1990, and four between December 25, 1990, and January 2, 1991. Maximum fluxes above 30 keV ranged from ~1 to 800 (cm2 s ster)-1 and anisotropies ranged from 2:1 to 12:1 peak-to-minimum ratio. At least one event (December 15) showed complex fluctuations in the direction and amplitude of the anisotropy on time scales of minutes. We describe the spectrum, anisotropy, and temporal behavior of these events and the implications for electron injection and propagation, and we summarize related solar and interplanetary phenomena.

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Last modified March 4, 2010
T. Hunt-Ward
tizby@ftecs.com