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The phrase "is observed to" is correct and usable in written English.
It can be used in contexts where you want to indicate that something has been seen or noted to happen, often in scientific or formal writing.
Example: "The phenomenon is observed to occur more frequently during the summer months."
Alternatives: "is noted to" or "is seen to".
Exact(60)
Ball lightning is observed to enter rooms by passing through closed glass windows.
The Sun is observed to be a torsional oscillator with a period of 11 years.
The water yield is observed to increase with relative humidity.
In the resulting Fe(CO) molecule, the CO structure is observed to attach at an angle.
that the man is smartly dressed, or that he is observed to wander about at night.
Factorization is observed to be broken as a function of both particle pT and nu.
Bubble fluctuation is observed to be stronger than liquid fluctuation.
The potential well is observed to shift toward the lower density side of the exhaust region in MRX10.
The supernova debris is observed to expand at a speed of about six million miles per hour.
The distribution of zinc in the oceans is observed to generally parallel silicate distributions.
The optimized component when manufactured is observed to be safe, no thinning or fracture is observed.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com