Table 1
Brightness temperatures Tb of various structures in the solar atmosphere.
| Structure | r | Tb (QS) | n(QS) | Tb(structure) | n(structure) | ΔTb = Tb(structure) − Tb(QS) |
|---|---|---|---|---|---|---|
| (pixels) | (K) | (pixels) | (K) | (pixels) | (K) | |
| QS | 0 | 6040 ± 70 | 78 | 6040 ± 70 | 78 | 0 |
| SS | 77 | 6170 ± 140 | 2833 | 6080 ± 210 | 136 | − 90 |
| AR1 | 105 | 6240 ± 150 | 2832 | 7250 ± 210 | 3048 | + 1010 |
| IL | 147 | 6300 ± 160 | 2833 | 6130 ± 160 | 897 | − 170 |
| PR (FIL1) | 229 | 6460 ± 160 | 2824 | 6350 ± 110 | 154 | − 110 |
| CH1 | 273 | 6590 ± 140 | 2833 | 6540 ± 130 | 2804 | − 50 |
Notes. Structures refer to the regions of interest denoted in Fig. 1a: central quiet Sun (QS), sunspot (SS), active region (AR1), magnetic inversion line (IL), prominence on the disc (PR/FIL1) and coronal hole (CH1). The mean values of brightness temperature of these structures, given here in K together with their corresponding standard deviations, are compared with the ones of the quiet Sun regions at the same radial distances from the centre of the solar disc, r in pixels. The averaging was performed within selected regions of interest and the number of pixels within is denoted by n.
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