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14 results on '"Pine, Zackary B."'

1. Magnetic Waves Excited by Newborn Pickup H + Near Jupiter: Neutral Hydrogen Loss by the Planetary System

Author

Hollick, Sophia J., primary, Smith, Charles W., additional, Pine, Zackary B., additional, Argall, Matthew R., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, Kubiak, Marzena A., additional, Bagenal, F., additional, and Richardson, John D., additional

Published
2022
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2. Magnetic Waves Excited by Newborn Pickup H+ Near Jupiter: Neutral Hydrogen Loss by the Planetary System.

Author

Hollick, Sophia J., Smith, Charles W., Pine, Zackary B., Argall, Matthew R., Joyce, Colin J., Isenberg, Philip A., Vasquez, Bernard J., Schwadron, Nathan A., Sokół, Justyna M., Bzowski, Maciej, Kubiak, Marzena A., Bagenal, F., and Richardson, John D.

Subjects
PLANETARY systems, SOLAR wind, FLUXGATE magnetometers, JUPITER (Planet), CHARGE exchange, WIND waves
Abstract

We report here observations of magnetic waves recorded by the Voyager spacecraft in the solar wind near Jupiter that are possibly the result of excitation by newborn pickup H+. Consideration of growth rates due to the known interstellar ion sources strongly disfavor an interstellar source. To determine the likely source of the waves, we compute the minimum ion production rate by equating wave growth to turbulent cascade rates and derive a lower limit for the production of H+ at the times of observations. The only available source of neutral H at these times and at the levels required is the Jovian system, most notably charge exchange between energetic protons and the neutral clouds around Io and Europa's orbits. Further refinement of the source identity is not possible at this time. We provide an estimate for the neutral H source subject to assumptions of the latitudinal extent of the population which is not constrained by observation. Plain Language Summary: The Voyager spacecraft instruments include a fluxgate magnetometer called MAG that measures the changing ambient magnetic field. We report observations by MAG of low‐frequency waves in the solar wind outside the Jovian magnetosphere that are seen at frequencies and with characteristics that suggest the waves are excited by protons that originate as neutral hydrogen. Collision with solar wind protons ionize the neutral hydrogen to produce an energetic ion population called pickup ions. We use known characteristics of wave excitation by pickup ions to estimate the rate of pickup ion production. The only source that is strong enough to produce the pickup ions with the number density required is the Jovian system. Key Points: Magnetic waves were measured by Voyagers 1 and 2 in the solar wind near the magnetosphere of JupiterThese waves have signatures of excitation by local pickup H+ ionsA neutral H loss rate of ∼5 × 1028 s−1 from the Jovian system is estimated [ABSTRACT FROM AUTHOR]

Published
2022
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3. Solar Wind Turbulence from 1 to 45 au. III. Anisotropy of Magnetic Fluctuations in the Inertial Range Using Voyager and ACE Observations

Author

Pine, Zackary B., primary, Smith, Charles W., additional, Hollick, Sophia J., additional, Argall, Matthew R., additional, Vasquez, Bernard J., additional, Isenberg, Philip A., additional, Schwadron, Nathan A., additional, Joyce, Colin J., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, Kubiak, Marzena A., additional, Hamilton, Kathleen E., additional, McLaurin, Megan L., additional, and Leamon, Robert J., additional

Published
2020
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4. Solar Wind Turbulence from 1 to 45 au. I. Evidence for Dissipation of Magnetic Fluctuations Using Voyager and ACE Observations

Author

Pine, Zackary B., primary, Smith, Charles W., additional, Hollick, Sophia J., additional, Argall, Matthew R., additional, Vasquez, Bernard J., additional, Isenberg, Philip A., additional, Schwadron, Nathan A., additional, Joyce, Colin J., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, Kubiak, Marzena A., additional, Hamilton, Kathleen E., additional, McLaurin, Megan L., additional, and Leamon, Robert J., additional

Published
2020
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5. Solar Wind Turbulence from 1 to 45 au. IV. Turbulent Transport and Heating of the Solar Wind Using Voyager Observations

Author

Pine, Zackary B., primary, Smith, Charles W., additional, Hollick, Sophia J., additional, Argall, Matthew R., additional, Vasquez, Bernard J., additional, Isenberg, Philip A., additional, Schwadron, Nathan A., additional, Joyce, Colin J., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, Kubiak, Marzena A., additional, and McLaurin, Megan L., additional

Published
2020
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6. Solar Wind Turbulence from 1 to 45 au. II. Analysis of Inertial-range Fluctuations Using Voyager and ACE Observations.

Author

Pine, Zackary B., Smith, Charles W., Hollick, Sophia J., Argall, Matthew R., Vasquez, Bernard J., Isenberg, Philip A., Schwadron, Nathan A., Joyce, Colin J., Sokół, Justyna M., Bzowski, Maciej, Kubiak, Marzena A., Hamilton, Kathleen E., McLaurin, Megan L., and Leamon, Robert J.

Subjects
*MAGNETIC field measurements, *PLASMA waves, *SOLAR wind, *TURBULENCE, *EXPLORERS, *POWER spectra
Abstract

We examine both Voyager and Advanced Composition Explorer magnetic field measurements at frequencies that characterize the inertial range using traditional polarization techniques that are designed to characterize plasma waves. Although we find good agreement with both the anticipated spectral index of the power spectrum and the scaling of magnetic power with heliocentric distance, we do not find that the polarization analyses yield results that can be readily described by plasma wave theory. The fluctuations are not circularly polarized and there is a markedly reduced coherence between the components of the fluctuation. The degree of polarization is also generally low, although not as low as the coherence, and the minimum variance direction is essentially random. We conclude that traditional plasma wave theory may not offer a good description for inertial-range fluctuations. [ABSTRACT FROM AUTHOR]

Published
2020
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8. Magnetic Waves Excited by Newborn Interstellar Pickup Ions Measured by the Voyager Spacecraft from 1 to 45 au. III. Observation Times

Author

Hollick, Sophia J., primary, Smith, Charles W., additional, Pine, Zackary B., additional, Argall, Matthew R., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, and Kubiak, Marzena A., additional

Published
2018
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9. Magnetic Waves Excited by Newborn Interstellar Pickup Ions Measured by the Voyager Spacecraft from 1 to 45 au. II. Instability and Turbulence Analyses

Author

Hollick, Sophia J., primary, Smith, Charles W., additional, Pine, Zackary B., additional, Argall, Matthew R., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, and Kubiak, Marzena A., additional

Published
2018
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10. Magnetic Waves Excited by Newborn Interstellar Pickup Ions Measured by the Voyager Spacecraft from 1 to 45 au. I. Wave Properties

Author

Hollick, Sophia J., primary, Smith, Charles W., additional, Pine, Zackary B., additional, Argall, Matthew R., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, and Kubiak, Marzena A., additional

Published
2018
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11. Erratum: “Observation of Magnetic Waves Excited by Newborn Interstellar Pickup He+ Observed by the Voyager 2 Spacecraft at 30 au” (2017, ApJ, 849, 61)

Author

Argall, Matthew R., primary, Hollick, Sophia J., additional, Pine, Zackary B., additional, Smith, Charles W., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, and Burlaga, Leonard F., additional

Published
2018
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12. Observation of Magnetic Waves Excited by Newborn Interstellar Pickup He+ Observed by theVoyager 2Spacecraft at 30 au

Author

Argall, Matthew R., primary, Hollick, Sophia J., additional, Pine, Zackary B., additional, Smith, Charles W., additional, Joyce, Colin J., additional, Isenberg, Philip A., additional, Vasquez, Bernard J., additional, Schwadron, Nathan A., additional, Sokół, Justyna M., additional, Bzowski, Maciej, additional, and Burlaga, Leonard F., additional

Published
2017
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13. Observations of Low-Frequency Magnetic Waves due to Newborn Interstellar Pickup Ions Using ACE, Ulysses, and Voyager Data

Author

Smith, Charles W., primary, Aggarwal, Poornima, additional, Argall, Matthew R., additional, Burlaga, Leonard F., additional, Bzowski, Maciej, additional, Cannon, Bradford E., additional, Peter Gary, S., additional, Fisher, Meghan K., additional, Gilbert, Jason A., additional, Hollick, Sophia J., additional, Isenberg, Philip A., additional, Joyce, Colin J., additional, Murphy, Neil, additional, Nuno, Raquel G., additional, Pine, Zackary B., additional, Richardson, John D., additional, Schwadron, Nathan A., additional, Skoug, Ruth M., additional, Sokół, Justyna M., additional, Taylor, David K., additional, and Vasquez, Bernard J., additional

Published
2017
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14. Magnetic Waves Excited by Newborn Pickup H+Near Jupiter: Neutral Hydrogen Loss by the Planetary System

Author

Hollick, Sophia J., Smith, Charles W., Pine, Zackary B., Argall, Matthew R., Joyce, Colin J., Isenberg, Philip A., Vasquez, Bernard J., Schwadron, Nathan A., Sokół, Justyna M., Bzowski, Maciej, Kubiak, Marzena A., Bagenal, F., and Richardson, John D.

Abstract

We report here observations of magnetic waves recorded by the Voyager spacecraft in the solar wind near Jupiter that are possibly the result of excitation by newborn pickup H+. Consideration of growth rates due to the known interstellar ion sources strongly disfavor an interstellar source. To determine the likely source of the waves, we compute the minimum ion production rate by equating wave growth to turbulent cascade rates and derive a lower limit for the production of H+at the times of observations. The only available source of neutral H at these times and at the levels required is the Jovian system, most notably charge exchange between energetic protons and the neutral clouds around Io and Europa's orbits. Further refinement of the source identity is not possible at this time. We provide an estimate for the neutral H source subject to assumptions of the latitudinal extent of the population which is not constrained by observation. The Voyager spacecraft instruments include a fluxgate magnetometer called MAG that measures the changing ambient magnetic field. We report observations by MAG of low‐frequency waves in the solar wind outside the Jovian magnetosphere that are seen at frequencies and with characteristics that suggest the waves are excited by protons that originate as neutral hydrogen. Collision with solar wind protons ionize the neutral hydrogen to produce an energetic ion population called pickup ions. We use known characteristics of wave excitation by pickup ions to estimate the rate of pickup ion production. The only source that is strong enough to produce the pickup ions with the number density required is the Jovian system. Magnetic waves were measured by Voyagers 1 and 2 in the solar wind near the magnetosphere of JupiterThese waves have signatures of excitation by local pickup H+ionsA neutral H loss rate of ∼5 × 1028s−1from the Jovian system is estimated Magnetic waves were measured by Voyagers 1 and 2 in the solar wind near the magnetosphere of Jupiter These waves have signatures of excitation by local pickup H+ions A neutral H loss rate of ∼5 × 1028s−1from the Jovian system is estimated

Published
2022
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