# New electromagnetic memories and soft photon theorems

## TL;DR

This paper introduces a novel electromagnetic memory effect characterized by a magnetic B mode radiation, causing position displacements in charged particles, and links null electromagnetic memory to soft photon theorems via Fourier transforms.

## Contribution

It presents a new magnetic electromagnetic memory effect and establishes a connection between null memory formulas and soft photon theorems.

## Key findings

- Discovered a magnetic B mode radiation memory effect.
- Identified two types of electromagnetic displacement: ordinary and null.
- Linked null electromagnetic memory to soft photon theorems through Fourier transformation.

## Abstract

In this paper, we present a new type of electromagnetic memory. It is a `magnetic' type, or B mode, radiation memory effect. Rather than a residual velocity, we find a position displacement of a charged particle induced by the B mode radiation with memory. We find two types of electromagnetic displacement (ordinary and null). We also show that the null electromagnetic memory formulas are nothing but a Fourier transformation of soft photon theorems.