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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Models of Neptune's Smooth Recurrent Radio Emission

Models of Neptune's Smooth Recurrent Radio Emission

Nasa, National Aeronautics and Space Adm

Paperback

Astronomy & Space

Currently unavailable to order

ISBN10: 179269170X
ISBN13: 9781792691706
Publisher: Independently Published
Published: Dec 28 2018
Pages: 28
Weight: 0.20
Height: 0.06 Width: 8.50 Depth: 11.00
Language: English
The quantitative response of the Planetary Radio Astronomy (PRA) instrument to a wave with polarization ellipse of arbitrary shape and orientation, arriving at the antennas from any direction, can be determined. This capability is used to model the time variation of intensity and circular polarization over a range of radio frequencies for proposed radio-source locations and emission characteristics at Neptune. At frequencies below 400 kHz the observed variation of intensity, polarization, and phase are closely simulated in an offset tilted dipole magnetic field by conjugate sources at midlatitude with filled emission cones. The phase of emission at higher frequencies is reproduced by sources at lower latitude. Modeled wide-cone emission does not reach the spacecraft at the observed phase nor have the polarization sense observed before closest approach. Source-surface maps of apparent polarization for the period before closest approach when instrumental response is especially sensitive to source location is presented. The method is capable of extension to more realistic models of the magnetic field. Sawyer, Constance NASA-CR-193283, NAS 1.26:193283 NASW-4697...

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