Bibcode
MacDonald, G. A.; Henney, C. J.; Díaz Alfaro, M.; González Hernández, I.; Arge, C. N.; Lindsey, C.; McAteer, R. T. J.
Bibliographical reference
The Astrophysical Journal, Volume 807, Issue 1, article id. 21, 7 pp. (2015).
Advertised on:
7
2015
Journal
Citations
4
Refereed citations
4
Description
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.