Image patch analysis of sunspots and active regions. II. Clustering via matrix factorization

04/10/2015
by   Kevin R. Moon, et al.
0

Separating active regions that are quiet from potentially eruptive ones is a key issue in Space Weather applications. Traditional classification schemes such as Mount Wilson and McIntosh have been effective in relating an active region large scale magnetic configuration to its ability to produce eruptive events. However, their qualitative nature prevents systematic studies of an active region's evolution for example. We introduce a new clustering of active regions that is based on the local geometry observed in Line of Sight magnetogram and continuum images. We use a reduced-dimension representation of an active region that is obtained by factoring the corresponding data matrix comprised of local image patches. Two factorizations can be compared via the definition of appropriate metrics on the resulting factors. The distances obtained from these metrics are then used to cluster the active regions. We find that these metrics result in natural clusterings of active regions. The clusterings are related to large scale descriptors of an active region such as its size, its local magnetic field distribution, and its complexity as measured by the Mount Wilson classification scheme. We also find that including data focused on the neutral line of an active region can result in an increased correspondence between our clustering results and other active region descriptors such as the Mount Wilson classifications and the R value. We provide some recommendations for which metrics, matrix factorization techniques, and regions of interest to use to study active regions.

READ FULL TEXT

page 4

page 6

page 9

page 21

research
03/13/2015

Image patch analysis of sunspots and active regions. I. Intrinsic dimension and correlation analysis

The flare-productivity of an active region is observed to be related to ...
research
06/24/2014

Image patch analysis and clustering of sunspots: a dimensionality reduction approach

Sunspots, as seen in white light or continuum images, are associated wit...
research
08/15/2019

Beyond Cartesian Representations for Local Descriptors

The dominant approach for learning local patch descriptors relies on sma...
research
10/06/2022

Research on the quantity and brightness evolution characteristics of Photospheric Bright Points groups

Context. Photospheric bright points (BPs), as the smallest magnetic elem...
research
05/24/2019

Large-Scale Statistical Survey of Magnetopause Reconnection

The Magnetospheric Multiscale Mission (MMS) seeks to study the micro-phy...
research
07/06/2020

Feasibility Analysis for the Problem of Active Near Field/Far Field Acoustic Pattern Synthesis in Free Space and Shallow Water Environments

In this paper, a detailed sensitivity analysis of the active manipulatio...
research
05/21/2019

Spatially Constrained Spectral Clustering Algorithms for Region Delineation

Regionalization is the task of dividing up a landscape into homogeneous ...

Please sign up or login with your details

Forgot password? Click here to reset