“A flare and a CME are the same thing”: how much of it is actually true?
A flare is mainly a rapid release of electromagnetic energy; a CME is an ejection of magnetised plasma. They can arise from the same magnetic event, but one can occur without the other.
What it really means
Auroras invite simple rules, but the physics rarely fits a slogan. The myth about “A flare and a CME are the same thing” usually starts when a useful correlation is turned into an absolute law. There is usually a kernel of truth, but the problem begins when context is removed. That context is what separates useful practical advice from a false universal rule.
Why it matters
To test a claim, separate what genuinely changes auroral physics from what only changes our ability to see it. The Sun, magnetosphere, atmosphere, clouds, ambient light and camera sensitivity belong to different parts of the problem. The right approach is to turn the absolute statement into a probabilistic question: does it increase or decrease the odds, under which conditions, and what other factor might explain what we are seeing?
How to interpret it without oversimplifying
The most useful question is which measurable quantity should change if the claim were true. This avoids relying on isolated photographs, personal anecdotes or apps that oversimplify a dynamic phenomenon.
Timescale matters as well: some solar processes evolve in minutes, others over days or entire rotations. Data should therefore be compared with the correct physical process, not merely with the clock time at which an aurora was seen.