Abstract
[1] Recently, Howard and Tappin [2005] (hereinafter referred to as HT) reported on a set of 7 interplanetary (IP) shocks, apparently not connected with any detectable coronal mass ejection (CME) activity along the Sun-Earth line and concluded that there was no evidence to associate 6 of them with corotating interaction regions (CIRs); they were uncertain about one event. Based on these results, HT put forth a proposal that the 6 shocks were associated with ‘‘erupting magnetic structures’’ or EMSs and that EMSs rather than CIRs are the dominant cause of IP shocks that cannot be associated with halo CMEs. Our analysis of these events does not agree with these conclusions due the following reasons: (1) the Solar and Heliospheric Observatory (SOHO) mission had a data gap for one event , and (23 October 1998), so the CME association could not be checked; (2) the 18 May 1999 and 23 December 2001 shocks were likely CIR-related; (3) the remaining 4 shocks were CME-related, two (7 April 1998 and 9 November 2002) reported in the published literature [Manoharan et al., 2004] and the other two (both on 23 August 1999) were associated with two successive CMEs from the same region ejected off the Sun-earth line. Therefore, we do not see any basis for invoking anything other than CIRs and CMEs. In the following, we revisit the source of each of the 7 shocks.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
