Example of the identified BMEs based on the HMI magnetic observations and AIA images at 211 Å. The BME is located in the southern pole, which is indicated by the white box in the top two panels. The bottom two rows show the magnetic evolution of BME from its appearance to disappearance in the field of view of the white box. The BMEs are highlighted by the green dotted ellipses. The brightening at 211 Å is shown in the second row.