Real-time solar image classification: Assessing spectral, pixel-based approaches
release_xsse2b4s5vdqpm6riwfr5hxjem
by
J. Marcus Hughes, Vicki W. Hsu, DANIEL SEATON, Hazel M Bain, Jonathan M. Darnel, LARISZA KRISTA
Abstract
In order to utilize solar imagery for real-time feature identification and large-scale data science investigations of solar structures, we need maps of the Sun where phenomena, or themes, are labeled. Since solar imagers produce observations every few minutes, it is not feasible to label all images by hand. Here, we compare three machine learning algorithms performing solar image classification using Extreme Ultraviolet (EUV) and H<jats:italic>α</jats:italic> images: a maximum likelihood model assuming a single normal probability distribution for each theme from Rigler et al. (2012) [<jats:italic>Space</jats:italic> <jats:italic>Weather</jats:italic> <jats:bold>10(8)</jats:bold>: 1–16], a maximum-likelihood model with an underlying Gaussian mixtures distribution, and a random forest model. We create a small database of expert-labeled maps to train and test these algorithms. Due to the ambiguity between the labels created by different experts, a collaborative labeling is used to include all inputs. We find the random forest algorithm performs the best amongst the three algorithms. The advantages of this algorithm are best highlighted in: comparison of outputs to hand-drawn maps; response to short-term variability; and tracking long-term changes on the Sun. Our work indicates that the next generation of solar image classification algorithms would benefit significantly from using spatial structure recognition, compared to only using spectral, pixel-by-pixel brightness distributions.
In application/xml+jats
format
Archived Files and Locations
application/pdf 3.4 MB
file_pat4u6cchngcxnq5km6ebiyjqq
|
web.archive.org (webarchive) www.swsc-journal.org (publisher) |
article-journal
Stage
published
Year 2019
access all versions, variants, and formats of this works (eg, pre-prints)
Crossref Metadata (via API)
Worldcat
SHERPA/RoMEO (journal policies)
wikidata.org
CORE.ac.uk
Semantic Scholar
Google Scholar