Solar Physics

, Volume 227, Issue 2, pp 339–353 | Cite as

Comparative Analyses of the CSSS Calculation in the UCSD Tomographic Solar Observations

  • T. Dunn
  • B. V. Jackson
  • P. P. Hick
  • A. Buffington
  • X. P. Zhao
Article

Abstract

We describe a new method to derive the interplanetary magnetic field (IMF) out to 1 AU from photospheric magnetic field measurements. The method uses photospheric magnetograms to calculate a source surface magnetic field at 15R. Specifically, we use Wilcox Solar Observatory (WSO) magnetograms as input for the Stanford Current-Sheet Source-Surface (CSSS) model. Beyond the source surface the magnetic field is convected along velocity flow lines derived by a tomographic technique developed at UCSD and applied to interplanetary scintillation (IPS) observations. We compare the results with in situ data smoothed by an 18-h running mean. Radial and tangential magnetic field amplitudes fit well for the 20 Carrington rotations studied, which are largely from the active phase of the solar cycle. We show exemplary results for Carrington rotation 1965, which includes the Bastille Day event.

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • T. Dunn
    • 1
  • B. V. Jackson
    • 1
  • P. P. Hick
    • 1
  • A. Buffington
    • 1
  • X. P. Zhao
    • 2
  1. 1.Center for Astrophysics and Space SciencesUniversity of California at San DiegoLa JollaU.S.A.
  2. 2.W.W. Hansen Experimental Physics LaboratoryStanford UniversityStanfordU.S.A.

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