A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing
Tekijät: Dresing N, Gomez-Herrero R, Heber B, Muller-Mellin R, Wimmer-Schweingruber R, Klassen A
Kustantaja: SPRINGER
Julkaisuvuosi: 2009
Journal: Solar Physics
Tietokannassa oleva lehden nimi: SOLAR PHYSICS
Lehden akronyymi: SOL PHYS
Vuosikerta: 256
Numero: 1-2
Aloitussivu: 409
Lopetussivu: 425
Sivujen määrä: 17
ISSN: 0038-0938
DOI: https://doi.org/10.1007/s11207-009-9356-3
Tiivistelmä
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 similar to aEuro parts per thousand 350% AU(-1) using Helios and Pioneer data.
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 similar to aEuro parts per thousand 350% AU(-1) using Helios and Pioneer data.
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