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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781728838847
Category : Science
Languages : en
Pages : 34
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Book Description
Analysis of nonthermal radio emission data obtained by the Planetary Radio Astronomy (PRA) spectrometers on the Voyager 1 and 2 spacecraft was performed. This PRA data provided unique insights into the radio emission characteristics of the outer planets because of PRA's unique spectral response below the terrestrial ionospheric plasma frequency and its unprecedented proximity to the source. Of those results which were documented or published, this final report surveys only the highlights and cites references for more complete discussions. Unpublished results for Uranus, Neptune, and theoretical Ionian current distributions are presented at greater length. The most important conclusion to be drawn from these observations is that banded spectral emission is common to the radio emission below 1-2 MHz observed from all four Jovian planets. In every case multiple spectral features evolve on time scales of seconds to minutes. To the extent these features drift in frequency, they appear never to cross one another. The Neptunian spectral features appear to drift little or not at all, their evolution consisting principally of waxing and waning. Since other evidence strongly suggests that most or all of this radio emission is occurring near the local magnetospheric electron cyclotron frequency, this implies that this emission preferentially occurs at certain continually changing planetary radii. It remains unknown why certain radii might be favored, unless radial electric field components or other means serve to differentiate radially the magnetospheric plasma density, particle energy vectors, or particle coherence. Calculation of the spatial distribution and intensity of the Io-generated magnetospheric currents are also presented; these currents may be limited principally by wave impedance and local field strengths. Staelin, David H. and Eikenberry, Stephen S. Unspecified Center NAG5-537
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781728838847
Category : Science
Languages : en
Pages : 34
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Book Description
Analysis of nonthermal radio emission data obtained by the Planetary Radio Astronomy (PRA) spectrometers on the Voyager 1 and 2 spacecraft was performed. This PRA data provided unique insights into the radio emission characteristics of the outer planets because of PRA's unique spectral response below the terrestrial ionospheric plasma frequency and its unprecedented proximity to the source. Of those results which were documented or published, this final report surveys only the highlights and cites references for more complete discussions. Unpublished results for Uranus, Neptune, and theoretical Ionian current distributions are presented at greater length. The most important conclusion to be drawn from these observations is that banded spectral emission is common to the radio emission below 1-2 MHz observed from all four Jovian planets. In every case multiple spectral features evolve on time scales of seconds to minutes. To the extent these features drift in frequency, they appear never to cross one another. The Neptunian spectral features appear to drift little or not at all, their evolution consisting principally of waxing and waning. Since other evidence strongly suggests that most or all of this radio emission is occurring near the local magnetospheric electron cyclotron frequency, this implies that this emission preferentially occurs at certain continually changing planetary radii. It remains unknown why certain radii might be favored, unless radial electric field components or other means serve to differentiate radially the magnetospheric plasma density, particle energy vectors, or particle coherence. Calculation of the spatial distribution and intensity of the Io-generated magnetospheric currents are also presented; these currents may be limited principally by wave impedance and local field strengths. Staelin, David H. and Eikenberry, Stephen S. Unspecified Center NAG5-537
Author: Jet Propulsion Laboratory (U.S.)
Publisher:
ISBN:
Category : Outer space
Languages : en
Pages : 24
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Book Description
Author:
Publisher:
ISBN:
Category : Saturn (Planet)
Languages : en
Pages : 16
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Book Description
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Publisher:
ISBN:
Category : Jupiter (Planet)
Languages : en
Pages : 72
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Book Description
Author: Henry C. Dethloff
Publisher: Konecky & Konecky
ISBN: 9781568527154
Category : Outer planets
Languages : en
Pages : 300
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Book Description
Voyager 1 and Voyager 2 were launched in 1977. Since then they have traveled farther than any human object. Voyager 1 is now over 10 billion miles from the sun and is headed to the utmost boundary of our solar system. This book, originally published under the auspices of the Smithsonian Institution, tells the story of their journey through the solar system and beyond. The authors' unparalleled access to NASA archives and imagery make this authoritative work on the subject. The book includes an 8 pages of photographs and computer generated imagery and black and white photos throughout.
Author: Joan Marie Verba
Publisher: FTL Publications
ISBN: 0982523203
Category : Science
Languages : en
Pages : 31
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Book Description
In 1977, NASA launched the space probes Voyager 1 and Voyager 2 to explore Jupiter, Saturn, Uranus, and Neptune. This book tells of what was known about those planets and their moons before the Voyager missions, as well as what Voyager discovered about those planets and their moons. This book is written for the middle-grade reader, and can be enjoyed by readers age 12 and up.
Author: Jim Bell
Publisher: Dutton
ISBN: 1101983892
Category : Science
Languages : en
Pages : 338
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Book Description
The story of the men and women who drove the Voyager spacecraft mission— told by a scientist who was there from the beginning. --Publisher
Author: Ben Evans
Publisher: Springer Nature
ISBN: 303107923X
Category : Science
Languages : en
Pages : 256
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Book Description
2022 marks the 45th anniversary of the Voyager probe launches. Launched into space in 1977, these twin probes explored the farthest reaches of the Solar System before venturing on a one-way journey beyond, all the while testing the bounds of science, robotic exploration and our collective imagination. This heavily revised commemorative book takes a comprehensive look at their incredible achievements, future potential and overall legacy. Chronicled herein is an epic journey to unveil the mysterious outer reaches of the Solar System for the first time. The book recounts the Voyagers’ travels through the asteroid belt and past the giant gaseous planets Jupiter and Saturn, as well as Voyager 2’s forays near the distant ice giants Uranus and Neptune. Each chapter details in full the game-changing scientific data and glorious imagery they sent back to Earth. This new edition incorporates all the new data we have learned in the nearly 20 years since its original publication, discussing how the knowledge first gleaned with Voyager has been built upon in subsequent decades by Cassini, Juno and New Horizons. The Voyager probes captured imaginations around the world; now is an opportune time to reflect on their unparalleled quest across the edges of the Solar System and the enigmatic interstellar medium beyond.
Author: COSPAR. Plenary Meeting
Publisher: Elsevier Science & Technology
ISBN:
Category : Science
Languages : en
Pages : 212
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Book Description
The twenty papers presented in this volume are divided into three chapters. Firstly, Neptune After Voyager, which contains the bulk of the material; secondly, Comparative Studies of Planetary Rings, and finally, Planetary Exploration from Earth Orbit.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 772
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Book Description
