AIM Diffusion Field Resonance

AIM Diffusion Field Resonance is an AIM-related phenomena in which an esper's powers resonate with others.

Principles
AIM Diffusion Field Resonance is a phenomena stated to occur when a pair or group of espers tend to gather together within a localized area. For example, Misaka Mikoto can resonate with other espers who emit a similar form of AIM energy to her own and construct AIM Diffusion Fields of a similar nature to her own as well. Normally, this phenomena is relative harmless for all parties involved in it. In Mikoto's case, this can allow for her to detect other esper's with the same ability as her own; with the strength of this detection seemingly being dependent on how similar another esper's ability is to her own (such as how Mikoto was able to better sense the esper powers of her sisters than other electromaster espers in close enough proximity).

Unfortunately however, when an overloaded esper who is currently undergoing an unstable state of mind comes into close proximity with other espers, it can lead to the occurrence of a RSPK Syndrome incident. This can cause the relatively harmless AIM Field resonance to become relative harmful and catastrophic to both those involved and the environment affected by it.

Poltergeist Arc
The possibility of an AIM Diffusion Field Resonance being the cause of the Poltergeist incidents happening across Academy City was initially referred to by Konori Mii. Sometime after this, Shirai Kuroko explained to Mikoto the relevance of the phenomena to the current poltergeist events happening all over the city.

It is later revealed by Therestina, that exposing Haruue Erii (since she can exhibit power beyond her level class when exposed to a specific wavelength) to the Crystallized Esper Essence would cause a resonance with Kiyama Harumi's Child Error students, allowing her to achieve that specific wavelength, causing her to achieve Level 6 at the cost of destroying the city.

Sisters Arc
On August 15th, Mikoto was introduced to a child who had a similar power to her. The children asked if one day they could form a 'radio' together (i.e. if they could talk to each other with their powers). Mikoto told them that it was impossible, but if they were in an open space with no obstruction, then they would be able to detect each other. Mikoto then commented to herself that they could make a network if they had similar brainwaves, just like the Level Upper, then they could in theory make something similar to a radio.

Mikoto later detects a similar power to hers, and discovers the existence of Misaka 9982 and the clones.