Solar Physics

, Volume 256, Issue 1, pp 409–425

Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing

  • Nina Dresing
  • Raúl Gómez-Herrero
  • Bernd Heber
  • Reinhold Müller-Mellin
  • Robert Wimmer-Schweingruber
  • Andreas Klassen
STEREO SCIENCE RESULTS AT SOLAR MINIMUM

DOI: 10.1007/s11207-009-9356-3

Cite this article as:
Dresing, N., Gómez-Herrero, R., Heber, B. et al. Sol Phys (2009) 256: 409. doi:10.1007/s11207-009-9356-3

Abstract

The period between 21 June and 8 October, 2007 (Carrington rotations 2058 to 2061), comprising the Ulysses ecliptic plane crossing, was characterized by low solar activity. Excluding the small solar energetic particle events observed during July, the ion increases observed in the inner heliosphere between 100 keV/n and 10 MeV/n were associated with Corotating Interaction Regions (CIRs). In this work, we investigate CIR-related ion increases using multipoint observations from Ulysses, ACE, and the twin STEREO spacecraft. The ballistic backmapping technique has been used to correlate in situ observations of these spacecraft and remote-sensing observations of coronal holes. Although the radial, longitudinal and latitudinal separation of the spacecraft (except Ulysses) are relatively small, we find discrepancies when a detailed comparison of narrow structures like stream interfaces and CIR-associated shocks is performed. Therefore we concentrate on the two CIR events from day 5 to day 10 of August 2007 and from day 25 to day 31 of August 2007, which lend themselves to a more undisturbed comparison. Using the multi-spacecraft measurements we could determine a radial gradient of 230±30% AU−1, which is consistent with previous results by van Hollebeke et al. (J. Geophys. Res.83, 4723, 1978) of ∼ 350% AU−1 using Helios and Pioneer data.

Keywords

Corotating interaction regions Energetic particles Gradients 

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Nina Dresing
    • 1
  • Raúl Gómez-Herrero
    • 1
  • Bernd Heber
    • 1
  • Reinhold Müller-Mellin
    • 1
  • Robert Wimmer-Schweingruber
    • 1
  • Andreas Klassen
    • 1
  1. 1.Institut für Experimentelle und Angewandte PhysikChristian-Albrechts-Universität KielKielGermany

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