Open Access
Table 1.
Parameters of the VTT and BBSO data sets.
| Instrument | VTT/echelle |
GST/FISS | |
|---|---|---|---|
| Data set | 2018 December 11 | 2019 June 6 | 2019 October 3 |
| Time | 11:42 UT | 11:00 UT | 17:46 UT |
| Target | Weak AR ( * ) – pore | Weak AR ( * ) – plage | Quiet Sun |
| Scanned lines | Hα 656.28 nm | Hα 656.28 nm | Hα 656.28 nm |
| Hβ 486.13 nm | Hβ 486.13 nm | Ca II 854.2 nm | |
| Coordinates | −423″E, 147″N | −416″E, 122″N | 0″E, 0″N |
| Cosine of heliocentric angle | μ = 0.88 | μ = 0.89 | μ = 1.00 |
| No. of spectral points | 2004 (Hα) | 334 (Hα) | 512 (Hα) |
| 1560 (Hβ) | 334 (Hβ) | 502 (Ca II 854.2 nm) | |
| Wavelength spacing | 0.41 pm (Hα) | 1.66 pm (Hα) | 1.9 pm (Hα) |
| 0.3 pm (Hβ) | 1.21 pm (Hβ) | 2.6 pm (Ca II 854.2 nm) | |
| Wavelength range | 822 pm (Hα) | 555.3 pm (Hα) | 972.8 pm (Hα) |
| 468 pm (Hβ) | 403.3 pm (Hβ) | 1305.2 pm (Ca II 854.2 nm) | |
| Field of view |
 ×  |
 × 180″ |
20″ × 41″ |
| Region of interest |
 ×  |
 × 126″ |
 ×  |
| Pixel size |
 |
 |
 |
| Exposure time | 300 ms | 80 ms | 60 ms |
| Raster scan time | 25 s | 25 s | 22.9 s |
| No. of spectral scans | 60 | 200 | 210 |
Notes. ( * )Active region.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.