Abstract
We present a new automated algorithm to identify, track, and characterize small-scale brightening associated with solar eruptive phenomena observed in Hα. The temporal, spatially localized changes in chromospheric intensities can be separated into two categories: flare ribbons and sequential chromospheric brightenings (SCBs). Within each category of brightening we determine the smallest resolvable locus of pixels, a kernel, and track the temporal evolution of the position and intensity of each kernel. This tracking is accomplished by isolating the eruptive features, identifying kernels, and linking detections between frames into trajectories of kernels. We fully characterize the evolving intensity and morphology of the flare ribbons by observing the tracked flare kernels in aggregate. With the location of SCB and flare kernels identified, they can easily be overlaid on complementary data sets to extract Doppler velocities and magnetic-field intensities underlying the kernels. This algorithm is adaptable to any dataset to identify and track solar features.
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Balasubramaniam, K.S., Pevtsov, A.A., Neidig, D.F., Cliver, E.W., Thompson, B.J., Young, C.A., Martin, S.F., Kiplinger, A.: 2005, Sequential chromospheric brightenings beneath a transequatorial halo coronal mass ejection. Astrophys. J. 630, 1160 – 1167. doi: 10.1086/432030 .
Balasubramaniam, K.S., Pevtsov, A.A., Neidig, D.F., Hock, R.A.: 2006, Large scale solar chromospheric eruptive activity – a signature of magnetic reconnection. In: Gopalswamy, N., Bhattacharyya, A. (eds.) Proc. ILWS Workshop, Goa, India Quest, Mumboi, 65.
Crocker, J.C., Grier, D.G.: 1996, Methods of digital video microscopy for colloidal studies. J. Colloid Interface Sci. 179(1), 298 – 310. doi: 10.1006/jcis.1996.0217 .
Gill, C.D., Fletcher, L., Marshall, S.: 2010, Using active contours for semi-automated tracking of UV and EUV solar flare ribbons. Solar Phys. 262, 355 – 371. doi: 10.1007/s11207-010-9508-5 .
Hestroffer, D., Magnan, C.: 1998, Wavelength dependency of the Solar limb darkening. Astron. Astrophys. 333, 338 – 342.
Maurya, R.A., Ambastha, A.: 2010, A technique for automated determination of flare ribbon separation and energy release. Solar Phys. 262, 337 – 353. doi: 10.1007/s11207-009-9488-5 .
McAteer, R.T.J., Gallagher, P.T., Williams, D.R., Mathioudakis, M., Phillips, K.J.H., Keenan, F.P.: 2002, Long-period chromospheric oscillations in network bright points. Astrophys. J. Lett. 567, L165 – L168. doi: 10.1086/340110 .
Neckel, H., Labs, D.: 1994, Solar limb darkening 1986 – 1990 (lambda 303 to 1099 nm). Solar Phys. 153, 91 – 114. doi: 10.1007/BF00712494 .
Neidig, D., Wiborg, P., Confer, M., Haas, B., Dunn, R., Balasubramaniam, K.S., Gullixson, C., Craig, D., Kaufman, M., Hull, W., McGraw, R., Henry, T., Rentschler, R., Keller, C., Jones, H., Coulter, R., Gregory, S., Schimming, R., Smaga, B.: 1998, The USAF improved solar observing optical network (ISOON) and its impact on solar synoptic data bases. In: Balasubramaniam, K.S., Harvey, J., Rabin, D. (eds.) Synoptic Solar Physics, CS-140, Astron. Soc. Pacific, San Francisco, 519.
November, L.J., Simon, G.W.: 1988, Precise proper-motion measurement of solar granulation. Astrophys. J. 333, 427 – 442. doi: 10.1086/166758 .
Pevtsov, A.A., Balasubramaniam, K.S., Hock, R.A.: 2007, Sequential chromospheric brightenings: The case for chromospheric evaporation. Adv. Space Res. 39, 1781 – 1786. doi: 10.1016/j.asr.2007.02.058 .
Qu, M., Shih, F.Y., Jing, J., Wang, H.: 2003, Automatic solar flare detection using MLP, RBF, and SVM. Solar Phys. 217, 157 – 172.
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Image Processing in the Petabyte Era
Guest Editors: J. Ireland and C.A. Young
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Kirk, M.S., Balasubramaniam, K.S., Jackiewicz, J. et al. An Automated Algorithm to Distinguish and Characterize Solar Flares and Associated Sequential Chromospheric Brightenings. Sol Phys 283, 97–111 (2013). https://doi.org/10.1007/s11207-011-9843-1
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DOI: https://doi.org/10.1007/s11207-011-9843-1