urn:nasa:pds:voyager2_rss_jupiter_raw 1.0 1.16.0.0 Product_Bundle Simpson, R. A. 2023 10.17189/2e1e-de40 The bundle contains raw radio science data from the Voyager 2 radio occultation at Jupiter. Data include sampled output from S- and X-band receivers at the 64-m antenna of the NASA Deep Space Network near Madrid, Spain. Also included are receiver tuning data, files containing reconstructed pointing of the spacecraft high-gain antenna, a trajectory reconstruction, and documentation. 2023-12-20 1.0 These data were restored from original files delivered to the Voyager Radio Science Team at Stanford University. Binary data (headers, trailers, and receiver samples) were converted to ASCII; both binary and ASCII versions are included in the PDS4 archive. New PDS4 labels were generated, and documentation was improved. Browse products (quick-look plots in PDF/A-1b format) show histograms of receiver output at both S-band (13 cm wavelength) and X-band (3.6 cm wavelegth). 1979-07-10T13:17:28Z 1979-07-10T21:37:37Z Science Raw Voyager Mission Mission urn:nasa:pds:context:investigation:mission.voyager bundle_to_investigation NASA Deep Space Network Host urn:nasa:pds:context:facility:observatory.dsn is_facility DSN Radio Science Instrumentation Instrument urn:nasa:pds:context:instrument:dsn.rss is_instrument DSS 14 64-m Antenna Telescope urn:nasa:pds:context:telescope:goldstone.dss14_64m is_telescope Voyager 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vg2 is_instrument_host Voyager 2 Radio Science Instrumentation Instrument urn:nasa:pds:context:instrument:vg2.rss is_instrument Voyager 2 Spacecraft Sensors Instrument urn:nasa:pds:context:instrument:vg2.eng is_instrument Jupiter Planet urn:nasa:pds:context:target:planet.jupiter bundle_to_target Eshleman, V. R., G. L. Tyler, G. E. Wood, G. F. Lindal, J. D. Anderson, G. S. Levy, and T. A. Croft, Radio Science with Voyager 1 at Jupiter: Preliminary Profiles of the Atmosphere and Ionosphere, Science, 204, pp. 976-978, 1979. A preliminary profile of the atmosphere of Jupiter in the South Equatorial Belt shows (i) the tropopause occurring at a pressure level of 100 millibars and temperature of about 113 K, (ii) a higher warm inversion layer at about the 35-millibar level, and (iii) a lower-altitude constant lapse rate matching the adiabatic value of about 2 K per kilometer, with the temperature reaching 150 K at the 600-millibar level. Preliminary afternoon and predawn ionospheric profiles at 12 degrees south latitude and near the equator, respectively, have topside plasma scale heights of 590 kilometers changing to 960 kilometers above an altitude of 3500 kilometers for the dayside, and about 960 kilometers at all measured heights above the peak for the nightside. The higher value of scale height corresponds to a plasma temperature of 1100 K under the assumption of a plasma of protons and electrons in ambipolar diffusive equilibrium. The peak electron concentration in the upper ionosphere is approximately 2 × 105 per cubic centimeter for the dayside and about a factor of 10 less for the nightside. These peaks occur at altitudes of 1600 and 2300 kilometers, respectively. Continuing analyses are expected to extend and refine these results, and to be used to investigate other regions and phenomena. Eshleman, V. R., G. L. Tyler, G. E. Wood, G. F. Lindal, J. D. Anderson, G. S. Levy, and T. A. Croft, Radio Science with Voyager at Jupiter: Initial Voyager 2 Results and a Voyager 1 Measure of the Io Torus, Science, 206, pp. 959-962, 1979. Voyager 2 radio signals were observed essentially continuously during a grazing occultation of the spacecraft by the southern limb of Jupiter. Intensity data show a classic atmospheric occultation profile and the effects of turbulence and ionospheric focusing and defocusing. No reliable profile of the neutral atmosphere has yet been obtained, primarily because of a combination of large trajectory uncertainties and error multiplication effects associated with the grazing geometry of the Voyager 2 occultation. Analysis of the dispersive ionospheric refraction data yields preliminary profiles for the topside ionosphere at 66.7 degrees S (entry in the evening) and 50.1 degrees S (exit in the morning) that are reversed with respect to corresponding Voyager 1 profiles in terms of plasma concentration at a fixed altitude. Plasma scale heights and temperatures of 880 kilometers, 1200 K and 1040 kilometers, 1600 K were obtained for morning and evening conditions, respectively. Preliminary reduction of the pre-encounter occultation of Voyager 1 by the Io torus yields an average plasma density of about 1000 electrons per cubic centimeter. Eshleman, V. R.; Tyler, G. L.; Anderson, J. D.; Fjeldbo, G.; Levy, G. S.; Wood, G. E.; and Croft, T. A. Radio science investigations with Voyager, Space Science Reviews, 21, 207-232, 1977. The planned radio science investigations during the Voyager missions to the outer planets involve: (1) the use of the radio links to and from the spacecraft for occultation measurements of planetary and satellite atmospheres and ionospheres, the rings of Saturn, the solar corona, and the general-relativistic time delay for radiowave propagation through the Sun's gravity field; (2) radio link measurements of true or apparent spacecraft motion caused by the gravity fields of the planets, the masses of their larger satellites, and characteristics of the interplanetary medium; and (3) related measurements which could provide results in other areas, including the possible detection of long-wavelength gravitational radiation propagating through the Solar System. The measurements will be used to study: atmospheric and ionospheric structure, constituents, and dynamics; the sizes, radial distribution, total mass, and other characteristics of the particles in the rings of Saturn; interior models for the major planets and the mean density and bulk composition of a number of their satellites; the plasma density and dynamics of the solar corona and interplanetary medium; and certain fundamental questions involving gravitation and relativity. The instrumentation for these experiments is the same ground-based and spacecraft radio systems as will be used for tracking and communicating with the Voyager spacecraft, although several important features of these systems have been provided primarily for the radio science investigations. Archive The bundle contains raw radio science data from the Voyager 2 radio occultation at Jupiter. Data include sampled output from S- and X-band receivers at the 64-m antenna of the NASA Deep Space Network near Madrid, Spain. Also included are receiver tuning data, files containing reconstructed pointing of the spacecraft high-gain antenna, a trajectory reconstruction, and documentation. bundle_readme.txt 2023-12-20T20:46:00 4002 851562b606e325b079d7c2de61123bc9 This file contains an overview of the bundle of raw radio science data from the Voyager 2 encounter with Jupiter. Voyager 2 Jupiter: Bundle of Radio Science Raw Data 0 7-Bit ASCII Text This file contains an overview of the bundle of raw radio science data from the Voyager 2 encounter with Jupiter. 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