Author ORCID Identifier
James McAteer:
https://orcid.org/0000-0003-1493-101X
Carl Henney:
https://orcid.org/0000-0002-6038-6369
Charles Lindsey:
https://orcid.org/0000-0002-5658-5541
Gordon MacDonald:
https://orcid.org/0000-0002-5259-5507
Manuel Díaz Alfaro:
https://orcid.org/0000-0002-4839-872X
Document Type
Journal Article
Journal Article Version
Final Version / Publisher's PDF (peer-reviewed)
Publication Date
7-1-2015
Abstract
We estimate the morphology of near-side active regions using near-side helioseismology. Active regions from two data sets, Air Force Data Assimilative Photospheric flux Transport synchronic maps and Global Oscillation Network Group near-side helioseismic maps, were matched and their morphologies compared. Our algorithm recognizes 382 helioseismic active regions between 2002 April 25 and 2005 December 31 and matches them to their corresponding magnetic active regions with 100% success. A magnetic active region occupies 30% of the area of its helioseismic signature. Recovered helioseismic tilt angles are in good agreement with magnetic tilt angles. Approximately 20% of helioseismic active regions can be decomposed into leading and trailing polarity. Leading polarity components show no discernible scaling relationship, but trailing magnetic polarity components occupy approximately 25% of the area of the trailing helioseismic component. A nearside phase-magnetic calibration is in close agreement with a previous far-side helioseismic calibration and provides confidence that these morphological relationships can be used with far-side helioseismic data. Including far-side active region morphology in synchronic maps will have implications for coronal magnetic topology predictions and solar wind forecasts.
Published in
Astrophysical Journal
DOI
10.1088/0004-637X/807/1/21
Keywords
Sun: helioseismology, sunspots, Sun: corona
Department / Organizational Unit
Astronomy
Copyright Notice
© 2015 G. MacDonald, C. Henney, M. Diaz Alfaro, et al., reuse allowed according to Creative Commons license.
License for Reuse
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
MacDonald, G. A., Henney, C. J., Diaz Alfaro, M., Hernandez, I. G., Arge, C. N., Lindsey, C., & McAteer, R. T. J. (2015). Active region morphologies selected from near-side helioseismic data. Astrophysical Journal, 807(1). https://doi.org/10.1088/0004-637X/807/1/21