English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In a recent paper, Leka at al. (Solar Phys. 260, 83, 2009)constructed asynthetic vector magnetogram representing a three-dimensional magneticstructure defined only within a fraction of an arcsec in height. They rebinnedthe magnetogram to simulate conditions of limited spatial resolution and thencompared the results of various azimuth disambiguation methods on the resampleddata. Methods relying on the physical calculation of potential and/ornon-potential magnetic fields failed in nearly the same, extended parts of thefield of view and Leka et al. (2009) attributed these failures to the limitedspatial resolution. This study shows that the failure of these methods is notdue to the limited spatial resolution but due to the narrowly defined testdata. Such narrow magnetic structures are not realistic in the real Sun.Physics-based disambiguation methods, adapted for solar magnetic fieldsextending to infinity, are not designed to handle such data; hence, they couldonly fail this test. I demonstrate how an appropriate limited-resolutiondisambiguation test can be performed by constructing a synthetic vectormagnetogram very similar to that of Leka et al. (2009) but representing astructure defined in the semi-infinite space above the solar photosphere. Forthis magnetogram I find that even a simple potential-field disambiguationmethod manages to resolve the ambiguity very successfully, regardless oflimited spatial resolution. Therefore, despite the conclusions of Leka et al.(2009), a proper limited-spatial-resolution test of azimuth disambiguationmethods is yet to be performed in order to identify the best ideas andalgorithms.

solar physics

Comment on "Resolving the 180-deg Ambiguity in Solar Vector Magnetic  Field Data: Evaluating the Effects of Noise, Spatial Resolution, and Method  Assumptions"