dc.contributor.author | BLOOMFIELD, SHAUN | en |
dc.contributor.author | GALLAGHER, PETER THOMAS | en |
dc.contributor.author | MC ATEER, ROBERT THOMAS JAMES | en |
dc.date.accessioned | 2011-03-15T14:55:59Z | |
dc.date.available | 2011-03-15T14:55:59Z | |
dc.date.issued | 2011 | en |
dc.date.submitted | 2011 | en |
dc.identifier.citation | Higgins, P. A., Gallagher, P. T., McAteer, R. T. J., Bloomfield, D. S., Solar Magnetic Feature Detection and Tracking for Space Weather Monitoring, Advances in Space Research, 47, 12, 2011, 2105-2117 | en |
dc.identifier.other | Y | en |
dc.identifier.uri | http://hdl.handle.net/2262/53274 | |
dc.description | PUBLISHED | en |
dc.description.abstract | We present an automated system for detecting, tracking, and cataloging emerging active regions throughout their evolution and decay using SOHO Michelson Doppler Interferometer (MDI) magnetograms. The SolarMonitor Active Region Tracking (SMART) algorithm relies on consecutive image differencing to remove both quiet-Sun and transient magnetic features, and region-growing techniques to group flux concentrations into classifiable features. We determine magnetic properties such as region size, total flux, flux imbalance, flux emergence rate, Schrijver's R-value, R* (a modified version of R), and Falconer's measurement of non-potentiality. A persistence algorithm is used to associate developed active regions with emerging flux regions in previous measurements, and to track regions beyond the limb through multiple solar rotations. We find that the total number and area of magnetic regions on disk vary with the sunspot cycle. While sunspot numbers are a proxy to the solar magnetic field, SMART offers a direct diagnostic of the surface magnetic field and its variation over timescale of hours to years. SMART will form the basis of the active region extraction and tracking algorithm for the Heliophysics Integrated Observatory (HELIO). | en |
dc.description.sponsorship | This research is supported by ESA/PRODEX and a Grant from the EC Framework Programme 7 (HELIO). R.T.J.McA. (FP6) and D.S.B. (FP7) are Marie Curie Fellows at TCD. We thank the SOHO team for making both their data and analysis software publicly available and to acknowledge the participants of the first ??_??_??_Forecasting the All-Clear??_??_ meeting (April 22??_??_??_24, 2009) who provided helpful comments and insights upon the presentation of this work. We acknowledge support from ISSI through funding for the International Team on SDO data mining and exploitation in Europe. We also show our appreciation to the two anonymous referees whose comments helped to improve this paper. | en |
dc.format.extent | 2105-2117 | en |
dc.language.iso | en | en |
dc.relation.ispartofseries | Advances in Space Research | en |
dc.relation.ispartofseries | 47 | en |
dc.relation.ispartofseries | 12 | en |
dc.rights | Y | en |
dc.subject | Astrophysics | en |
dc.subject | space weather | en |
dc.title | Solar Magnetic Feature Detection and Tracking for Space Weather Monitoring | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/mcateert | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/bloomfis | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/gallagpt | en |
dc.identifier.rssinternalid | 67316 | en |
dc.relation.ecprojectid | info:eu-repo/grantAgreement/EC/FP7/238969 | |
dc.rights.ecaccessrights | OpenAccess | |
dc.contributor.sponsor | European Commission | en |
dc.contributor.sponsorGrantNumber | 237645 | en |
dc.contributor.sponsor | Marie Curie | en |