Tag Archives: active regions
194. Rossby waves and the organization of photospheric magnetic fields
HMI magnetic field synoptic maps are used to evaluate the magnetic field structures’ organization and propagation as a function of time and latitude. It is demonstrated that the organization of longitudinal structures observed on synoptic maps is proportional to the level of activity at given latitudes.
192. Magnetic helicity and free magnetic energy as tools for probing eruptions in two differently evolving solar active regions
An analysis of two active regions shows that differently evolving ARs may produce major eruptive flares even when, in addition to the accumulation of significant free magnetic energy budgets, they accumulate large amounts of both left- and right-handed helicity without a strong dominance of one handedness over the other.
190. Improved CGEM Electric Field Inversion for HMI Active Regions
187. Precursor Identification for Strong Flares Based on Anomaly Detection Algorithm
177. Magnetic Helicity and Energy of Emerging Solar Active Regions and Their Eruptivity
174. Toward Improved Understanding of Magnetic Fields Participating in Solar Flares: Statistical Analysis of Magnetic Fields within Flare Ribbons
173. Buildup of the Magnetic Flux Ropes in Homologous Solar Eruptions
171. Flare-induced Sunquake Signatures in the Ultraviolet as Observed by the Atmospheric Imaging Assembly
168. Introducing the SPEAR Catalogue from HMI Data
In order to make the properties of magnetic features observed by SDO/HMI more accessible, the Solar Photospheric Ephemeral and Active Region (SPEAR) catalogue has been created as an easy-to-read tabulated text file. Tilt angles from the SPEAR catalogue are shown as a histogram (top) and as a function of latitude (bottom) with colors indicating all regions (blue), regions with anti-Joy (red), and anti-Hale (purple) tilts. Over 40% of regions disobey the laws of Joy and Hale.