Tag Archives: flares

211. Electric Current Neutralization and Critical Height of Flux Rope in Eruptive and Non-Eruptive Active Regions

Contributed by Johan Muhamad. Posted on May 12, 2025

Eruptive and non-eruptive solar flares were investigated based on an analysis of electric current neutralization and torus instability. Combined analysis of these factors offers a more reliable prediction of eruptive events than relying on either one alone.

210. The Role of Electric Currents in the October 2014 X1.6 Solar Flare

Contributed by Partha Chowdhury. Posted on April 28, 2025

The analysis of magnetic fields and electrical currents indicates that a specific configuration – currents in opposite magnetic regions flowing in the same direction and peaking concurrently – might create favorable conditions for the magnetic reconnection process that powers solar flares.

209. The Magnetic Origin of Chromospheric Moreton Waves

Contributed by Ze Zhong. Posted on March 21, 2025

Moreton waves were studied using a systematic survey of Moreton-wave events observed during the SDO era. The results showed that inclined magnetic configurations act as a wall, forcing eruptions and Moreton waves to propagate toward weaker magnetic fields.

207. Simulating the formation and eruption of magnetic flux ropes in the solar atmosphere

Contributed by P. Vemareddy. Posted on January 8, 2025

The coronal magnetic field evolution of the AR 11429 was simulated using time-dependent magneto-friction model. The model reproduced the magnetic structure that has remarkable correspondence with the spatial characteristics in coronal extreme ultraviolet images.

202. Optimization of Solar White-Light Flare Identification Methods and Its Application

Contributed by Yijun Hou. Posted on September 24, 2024

A new method was developed to identify white-light flares (WLFs) observed in SDO/HMI continuum intensity. The new method is able to identify around 30% of C-class flares (and more percentage in stronger flares) having white light brightening associated with them, greatly expanding the total number of WLFs observed by HMI. The increased number of detections would help a statistical study of the properties of WLFs.

198. Spectro-Polarimetric Properties of Sunquake Sources and the Origin of Sunquakes

Contributed by A. G. Kosovichev. Posted on February 13, 2024

A spectro-polarimetric analysis of the sunquake sources observed during an X1.5 flare revealed transient emission in the FeI 6173Å line core, indicating intense, impulsive heating in the lower photosphere at the beginning of the flare impulsive phase.

192. Magnetic helicity and free magnetic energy as tools for probing eruptions in two differently evolving solar active regions

Contributed by Evangelia Liokati. Posted on July 29, 2023

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.

187. Precursor Identification for Strong Flares Based on Anomaly Detection Algorithm

Contributed by Jingjing Wang. Posted on October 21, 2022

Some magnetic features in active regions, related to strong solar flares, are considered as “anomaly” features in a machine learning algorithm. An unsupervised auto-encoder network has been trained to identify such anomalies and is used to predict occurrence of strong flares.