Spectra of polar heliospheric fields and implications for field structure

D. Aaron Roberts, Joe Giacalone, J. Randy Jokipii, Melvyn L. Goldstein, Timothy D. Zepp

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The predictions of the "Fisk" model for a peak at the equatorial solar rotation frequency in the spectrum of the latitudinal component of the heliospheric magnetic field were found to give values significantly larger than those observed. The observed values were statistically the same as observed in the ecliptic and were consistent with random fluctuations about the (null) Parker field component. These conclusions are based on spectra of field and plasma quantities using Ulysses data from the first southern and northern polar passes. There was also no evidence for solar photospheric differential rotation in the latitudinal component. A related search for signatures of the differential rotation (not directly part of the Fisk magnetic field model) yielded the strongest evidence for a photospheric influence on the radial component of the solar wind velocity and related "compressive" quantities.

Original languageEnglish (US)
Article numberA08103
JournalJournal of Geophysical Research: Space Physics
Volume112
Issue number8
DOIs
StatePublished - Aug 1 2007

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Magnetic fields
magnetic field
Solar wind
solar wind velocity
solar rotation
ecliptic
solar wind
wind velocity
magnetic fields
Plasmas
plasma
signatures
prediction
predictions

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Spectra of polar heliospheric fields and implications for field structure. / Roberts, D. Aaron; Giacalone, Joe; Jokipii, J. Randy; Goldstein, Melvyn L.; Zepp, Timothy D.

In: Journal of Geophysical Research: Space Physics, Vol. 112, No. 8, A08103, 01.08.2007.

Research output: Contribution to journalArticle

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