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Table 4.

Electron densities and areas of the UV structures.

Event date Ref. time/[UT] A/[cm2] ne/[cm−3]
25–26 Apr. 2021 00:20 1.8 × 1022 2.0 × 105
11 Sep. 2021 10:15 1.1 × 1022 2.8 × 105
2 Oct. 2021 17:33 8.9 × 1021 2.8 × 105 (B)
25 Oct. 2021 15:19 1.3 × 1022 3.7 × 105 (B)
28 Oct. 2021 NW 18:49 3.9 × 1021 1.9 × 105
28 Oct. 2021 SE 21:19 3.4 × 1022 3.9 × 105 (B)

Notes. Areas A of the selected features obtained from a UV reference frame taken at the reference time in column two, as described for each event in Sect. 4.2 and the corresponding electron densities ne calculated using Eq. (7) from the co-temporal pB or total B image.

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