In:
Research in Astronomy and Astrophysics, IOP Publishing, Vol. 19, No. 11 ( 2019-11-01), p. 159-
Abstract:
As one of the three payloads for the Advanced Space-based Solar Observatory (ASO-S) mission, the Lyman-alpha (Ly α ) Solar Telescope (LST) is composed of three instruments: a Solar Corona Imager (SCI), a Ly α Solar Disk Imager (SDI) and a full-disk White-light Solar Telescope (WST). When working in-orbit, LST will simultaneously perform high-resolution imaging observations of all regions from the solar disk to the inner corona up to 2.5 R ⊙ (R ⊙ stands for the mean solar radius) with a spatial resolution of 4.8″ and 1.2″ for coronal and disk observations, respectively, and a temporal resolution of 30 – 120 s and 1 – 120 s for coronal and disk observations, respectively. The maximum exposure time can be up to 20 s due to precise pointing and image stabilization function. Among the three telescopes of LST, SCI is a dual-waveband coronagraph simultaneously and independently observing the inner corona in the HI Ly α (121.6±10 nm) line and white light (WL) (700±40 nm) wavebands by using a narrowband Ly α beam splitter and has a field of view (FOV) from 1.1 to 2.5 R ⊙ . The stray-light suppression level can attain 〈 10 −6 B ⊙ (B ⊙ is the mean brightness of the solar disk) at 1.1 R ⊙ and ≤5×10 −8 B ⊙ at 2.5 R ⊙ . SDI and WST are solar disk imagers working in the Ly α line and 360.0 nm wavebands, respectively, which adopt an off-axis two-mirror reflective structure with an FOV up to 1.2 R ⊙ , covering the inner coronal edge area and relating to coronal imaging. We present the up-to-date design for the LST payload.
Type of Medium:
Online Resource
ISSN:
1674-4527
DOI:
10.1088/1674-4527/19/11/159
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2019
detail.hit.zdb_id:
2511247-8
SSG:
6,25
SSG:
16,12
