History of Solar flare in Timeline

Solar flares are intense bursts of electromagnetic radiation originating in the Sun's atmosphere, typically within active regions. These flares are frequently associated with other solar events like coronal mass ejections and solar particle events, contributing to eruptive solar activity. The frequency of solar flares is linked to the Sun's 11-year solar cycle, increasing and decreasing with the cycle's activity.

1942: British Radar Operators Observe Solar Emission

On February 25 and 26, 1942, British radar operators observed radiation interpreted as solar emission by Stanley Hey, but the discovery remained unpublicized until after the conflict. Southworth also made similar observations the same year.

1943: First Radioastronomical Observations of the Sun Reported

In 1943, Grote Reber was the first to report radioastronomical observations of the Sun at 160 MHz, marking a significant milestone in understanding solar activity.

1945: Observations of the Sun in Radio Known After 1945

After 1945, observations of the Sun in radio by Southworth became known, contributing to the growing field of radioastronomy and the study of solar activity.

1970: Initial Solar Flare Classification System Devised

In 1970, the initial solar flare classification system was devised, including only the letters C, M, and X to avoid confusion with optical classification systems.

1984: Discovery of 154-day Period in Solar Flares

In 1984, Erich Rieger and his team discovered an approximately 154-day period in the occurrence of gamma-ray emitting solar flares since solar cycle 19, a period later confirmed and known as the Rieger period.

November 2003: Largest Solar Flare Measured with Instruments

In November 2003, the largest solar flare measured with instruments occurred, saturating the GOES detectors. Initially estimated at X28 based on extrapolating the GOES curve, later analysis suggested it could be as high as X45. This event also provided the first clear evidence of a new spectral component above 100 GHz.

2024: Limited Research on Solar Flare Effects on Mercury, Jupiter and Saturn

As of 2024, research on the effects of solar flares on Mercury has been limited to modeling of the response of ions in the planet's magnetosphere, and their impact on Jupiter and Saturn have only been studied in the context of X-ray radiation back scattering off of the planets' upper atmospheres.