Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft

Details Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382...34a&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 34-

Computer Science

5

Particle Emission, Solar Wind, Electric And Magnetic Fields, Solar Magnetism, Radio, Microwave

Scientific paper

Faraday rotation (FR) measurements using linearly polarized radio signals from the two Helios spacecraft were carried out during the period from 1975 to 1984. This paper presents the results of a spectral analysis of the Helios S-band FR fluctuations observed at heliocentric distances from Fig. 3 to 16 Rsolar during the superior conjunctions 1979-1984. The mean intensity of the FR fluctuations usually does not exceed the noise level for solar offsets greater than ~=15 Rsolar. The rms FR fluctuation amplitude increases rapidly as the radio ray path approaches the Sun. Good representations of the radial variation were obtained with a two-term empirical formula. The equivalent two-dimensional FR fluctuation spectra are well modeled by a single power-law over the frequency range from 1 to 50 mHz. There is a tendency for an increase of the spectral index from 1.2 at solar offset distances R>10 Rsolar to 1.6 at R<6 Rsolar, corresponding to a range for the three-dimensional spectral index p=2.2-2.6. FR fluctuations thus display a somewhat lower spectral index compared with phase and amplitude fluctuations. Finally, a quasiperiodic component, believed to be associated with Alfvén waves, was discovered in selected fluctuation spectra observed simultaneously at two ground stations. Characteristic periods and bulk velocities of this component were 240+/-30 sec and 300+/-60 km/s, respectively.

Affiliated with

Also associated with

No associations

Rating

Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Faraday rotation fluctuation spectra observed during solar occultation of the Helios spacecraft will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1115547