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Context
A simple technique of separating the constant background of the Solar corona unleashing the nitty-gritty of corona dynamics, has been developed by Indian researchers from Aryabhatta Research Institute of Observational Sciences (ARIES) in association with the Indian Institute of Astrophysics (an autonomous institute under DST).
Coronal Mass Ejection (CME)
These are dynamic structures in the Solar Corona that act as the driving force of space weather near Earth’s space.
What was the Challenge?
- It is a difficult task to identify the Coronal Mass Ejection through the radial distances in the images taken in the traditional coronagraphs.
- The density of the outermost layer of the atmosphere of the sun decreases with the distance radially outwards.
- As the intensity of the corona observed in white light depends on the density of particles in the atmosphere, it decreases exponentially.
- If the contrast between the constant corona and transient CMEs is not high, the detection of CME becomes challenging.
About the new method
- The new method developed by the Indian researchers has been named Simple Radiant Gradient Filter (SiRGraF).
- This method is capable of separating the background revealing the dynamic corona.
- This method eliminates the constant background and brings out the transient corona along with the reduction in the radial decrease in intensity.
- Therefore, this method offers a better field view of the CMEs facilitating their identification.
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