The DOI matches its Crossref record.
Sigmoidal morphology and eruptive solar activity
Open accessAbstract
Soft X‐ray images of solar active regions frequently show S‐ or inverse‐S (sigmoidal) morphology. We have studied the Yohkoh Soft X‐Ray Telescope video movie for 1993 and 1997. We have classified active regions according to morphology (sigmoidal or non‐sigmoidal) and nature of activity (eruptive or non‐eruptive). As well, we have used NOAA sunspot areas for each region as a measure of size. We find that regions are significantly more likely to be eruptive if they are either sigmoidal or large.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cited by
Coronal Mass Ejections: Observations
Webb, D. F., & Howard, T. A. (2012) · Living Reviews in Solar Physics · doi:10.12942/lrsp-2012-3 · Cited by 698
The Origin, Early Evolution and Predictability of Solar Eruptions
Green, L. M., Török, T., Vršnak, B., Manchester, W., & Veronig, A. (2018) · Space Science Reviews · doi:10.1007/s11214-017-0462-5 · Cited by 258
On space weather consequences and predictions
Feynman, J., & Gabriel, S. B. (2000) · Journal of Geophysical Research: Space Physics · doi:10.1029/1999ja000141 · Cited by 153
Metadata
- Authors
- Canfield, R. C., Hudson, H. S., & McKenzie, D. E.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 1999-03-15
- Volume
- 26
- Issue
- 6
- Pages
- 627-630
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2108882534
- Cited by
- 519
- References
- 0
- FWCI
- 25.93
- Type
- journal article
- Language
- en
- Open access
- bronze
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Sigmoidal morphology and eruptive solar activity. https://app.cochat.ai/papers/10.1029/1999gl900105
- The paper
- Canfield, R. C., Hudson, H. S., & McKenzie, D. E. (1999). Sigmoidal morphology and eruptive solar activity. Geophysical Research Letters. https://doi.org/10.1029/1999gl900105
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
