Beam profile determination by tomography of solar scans

dc.contributor.authorCosta J.E.R.
dc.contributor.authorSilva A.V.R.
dc.contributor.authorLudi A.
dc.contributor.authorMagun A.
dc.date.accessioned2024-03-13T01:46:47Z
dc.date.available2024-03-13T01:46:47Z
dc.date.issued2002
dc.description.abstractBeam patterns of radio telescopes with moderate (arcmin) angular resolution in the millimeter and sub-millimeter range are difficult to measure as only weak sources are available in that spectral range. This limitation can be overcome with the deconvolution of radial scans over the knife edge of the solar limb which provides beam profiles down to secondary lobe levels. Numerous applications, such as quick adjustments and checkups of telescope optics, efficiency estimates and the reconstruction of partially unresolved structures such as active regions, become possible. We investigate here the inverse problem of the beam profile reconstruction from the beam convolution with the solar limb. With simple derivatives of solar radial scans we obtained line integrals of the beam profile under different scanning angles. Reconstruction methods used in tomography of filtered reverse projection allowed us then to obtain beam profiles down to the level of secondary lobes. Tests of the algorithm were carried out with simulated data and solar scans that are verified by planet observations and terrestrial beam pattern measurements.
dc.description.firstpage1153
dc.description.issuenumber3
dc.description.lastpage1160
dc.description.volume387
dc.identifier.doi10.1051/0004-6361:20020379
dc.identifier.issn0004-6361
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/38027
dc.relation.ispartofAstronomy and Astrophysics
dc.rightsAcesso Aberto
dc.subject.otherlanguageInstrumentation: miscellaneous
dc.subject.otherlanguageSun: radio radiation
dc.subject.otherlanguageTelescopes
dc.titleBeam profile determination by tomography of solar scans
dc.typeArtigo
local.scopus.citations11
local.scopus.eid2-s2.0-0036605680
local.scopus.subjectSolar limbs
local.scopus.subjectSolar scans
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036605680&origin=inward
Arquivos