| Popis: |
On 12 October 2020 and 26 December 2021, NASA’s Global-scale Observations of the Limb and Disk (GOLD) mission observed differently shaped EPBs simultaneously within ~10o longitude, near the subsatellite point and over the Atlantic, respectively which is unusual. On 12 October 2020, three EPBs with differing curvatures were observed in a ~12o longitude sector. The westside EPB was curved towards the east, in a C-shape. The middle was straight. The eastside EPB was curved westward, in a reversed C-shape. In the second case, 26 December 2021, in a smaller longitude range of ~6o adjacent C-shaped and reversed C-shaped EPBs were observed. EPBs’ zonal drift velocities at the magnetic equator and both EIA crests were compared. These occurrences of oppositely shaped EPBs simultaneously in a narrow longitude may indicate that small-scale longitudinal variations in the E-region density, electric field, neutral wind variations, or a combination of them were present. |
