Completely plausible and very likely in use. Early HAARP demonstrated ability to do it, and after that, all the technology to do it and use it was very achievable.
Further, analysis tells me that once you have created an ionized lensing area for RF, its thermal differences can also refract optical frequencies. This means that the mirror would show up in the air as a visible blob, and due to the nature of phased-array generated beams, the 'object' could easily appear to move at abnormal speeds and well as dynamically change shape rapidly
For easy examples we can look at desert road mirages. There, a thermal difference between layers of air has a direct lensing effect. Similarly, where RF energy ionizes and heats air, it can create 'fat bubbles' of warmer air within colder air. Those will show up quite visibly especially if they are high up where they can refract light terrain that's far away.
Completely plausible and very likely in use. Early HAARP demonstrated ability to do it, and after that, all the technology to do it and use it was very achievable. Further, analysis tells me that once you have created an ionized lensing area for RF, its thermal differences can also refract optical frequencies. This means that the mirror would show up in the air as a visible blob, and due to the nature of phased-array generated beams, the 'object' could easily appear to move at abnormal speeds and well as dynamically change shape rapidly
For easy examples we can look at desert road mirages. There, a thermal difference between layers of air has a direct lensing effect. Similarly, where RF energy ionizes and heats air, it can create 'fat bubbles' of warmer air within colder air. Those will show up quite visibly especially if they are high up where they can refract light terrain that's far away.