Comparison of seismic signatures of flares obtained by SOHO/MDI and GONG instruments

TL;DR

This study compares seismic signatures of solar flares obtained from space-based SOHO/MDI and ground-based GONG instruments, demonstrating GONG's effectiveness in detecting sunquakes and enhancing understanding of flare-associated seismic processes.

Contribution

The paper introduces an updated pre-processing technique for GONG data and compares sunquake observations from GONG and MDI, including the first detection of a TD ridge with GONG data.

Findings

GONG data can reliably detect sunquakes similar to MDI.

Successful detection of the September 9, 2001 flare TD ridge with GONG.

GONG provides valuable complementary observations for solar seismic studies.

Abstract

The first observations of seismic responses to solar flares were carried out using time-distance (TD) and holography techniques applied to SOHO/MDI Dopplergrams obtained from space and un-affected by terrestrial atmospheric disturbances. However, the ground-based network GONG is potentially a very valuable source of sunquake observations, especially in cases where space observations are unavailable. In this paper we present updated technique for pre-processing of GONG observations for application of subjacent vantage holography. Using this method and TD diagrams we investigate several sunquakes observed in association with M and X-class solar flares and compare the outcomes with those reported earlier using MDI data. In both GONG and MDI datasets, for the first time, we also detect the TD ridge associated with the September 9, 2001 flare. Our results show reassuringly positive identification of sunquakes from GONG data that can provide further information about the physics of seismic processes associated with solar flares.