Read a flare through different filters

SUIT aboard Aditya-L1 observed an X6.3-class flare on February 22, 2024. ISRO discussed the result on February 28, 2025, alongside a study by Soumya Roy and colleagues. The event happened in 2024; the later article date is not a second observation of the same flare.

The figure shows a locating panel above eight narrow-band views of a selected region. Those panels are instrument observations with scientific display palettes and annotations. Their colours are not what an unaided human eye would see. The original timestamps, filter labels and region boxes are part of the evidence and remain visible.

The study explains that the lower panels show the region at the respective peak for each filter. They are therefore not eight simultaneous exposures. A row of pictures can hide that timing difference unless the reader checks the labels and the accompanying method.

Researchers compared ultraviolet observations with other instruments and found differences in the timing of some signal peaks. Such comparisons help investigate how an event appears in different measurements. They do not justify treating every displayed colour as a direct temperature or claiming that one image alone settles every mechanism of flare heating.

In an original same-filter exercise, a corrected signal rises from a baseline of 200 units to 300 units. The increase is 100 units, which is 50 percent of the baseline. A second filter might use a different response or display scale, so its raw number cannot automatically be compared as if it measured the same quantity in the same units.

Before comparing a time series, check exposure, calibration, region selection and time stamps. In this exercise, those conditions are assumed comparable. The calculation teaches a relative change; it is not a reanalysis of the published SUIT flare data or a conversion from brightness to plasma temperature.