Ultra Low-Frequency Oscillations of a Solar Filament in H{\alpha} Revealed With the Data of the Global Oscillation Network Group (Gong)

TL;DR

This study uses GONG H-alpha data to detect a new ultra-low frequency oscillation mode in a solar filament, with periods between 20 and 30 hours, marking a novel observation in solar physics.

Contribution

First detection of an ultra-low frequency oscillation mode in a solar filament using combined GONG H-alpha data from multiple observatories.

Findings

Identification of a new oscillation mode with 20-30 hour period

Reliable detection based on 5-day time-series data

Demonstrates the potential of GONG data for long-period solar oscillation studies

Abstract

The data of ground-based telescopes of Global Oscillation Network Group (GONG) obtained in the H-alpha line provide an opportunity to study the long-period oscillations of chromospheric filaments (quiescent prominence). For the first time, on the base of time-series of 5 days duration, combined from the observations of three observatories of the GONG, a new ultra-low mode, with period between 20 and 30 hours, was reliably detected in oscillations of a long-lived dark filament on the solar disc.