Coronal Mass Ejection (CME) is a huge explosion on the Sun where it throws out a massive cloud of plasma (hot gas made of charged particles) and magnetic field into space.
Coronal mass ejections magnetic field decreases with distance from the Sun in a very consistent and predictable way, following a power-law from about 0.07 au to 5 au from the sun. CME magnetic field decreases differently near the sun so researchers used a multipole type power law.
R is heliocentric distance
k= −1.57 for 0.07 au to 5 au from the sun.
k= - 6 for near-Sun
The power law constants B0 and B1 are then determined using a Levenberg-Marquardt algorithm It is used to solve non linear least square problems.
Source: https://arxiv.org/html/2512.04730v1
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