Difference between revisions of "Summary LFI"

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{{DISPLAYTITLE:Summary of LFI data characteristics}}
 
{{DISPLAYTITLE:Summary of LFI data characteristics}}
Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2014-a03}}.
+
Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2016-l02}}.  
<!-- {{PlanckPapers|planck2013-p02}} -->
 
 
 
  
 
{| border="1" cellspacing="0" cellpadding="2" align="center"
 
{| border="1" cellspacing="0" cellpadding="2" align="center"
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|width="100" | 44.1
 
|width="100" | 44.1
 
|width="100" | 70.4  
 
|width="100" | 70.4  
 +
|-
 +
|width="320" | Bandwidth [GHz]
 +
|width="100" | 9.89
 +
|width="100" | 10.72
 +
|width="100" | 14.90
 
|-
 
|-
 
|width="320" | Scanning beam FWHM<sup>a</sup> [arcmin]
 
|width="320" | Scanning beam FWHM<sup>a</sup> [arcmin]
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|-
 
|-
 
|width="320" | Effective beam FWHM<sup>b</sup> [arcmin]
 
|width="320" | Effective beam FWHM<sup>b</sup> [arcmin]
|width="100" | 32.29
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|width="100" | 32.29  
|width="100" | 27.00
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|width="100" | 27.00  
|width="100" | 13.21
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|width="100" | 13.22
 
|-
 
|-
|width="320" | White noise level in map<sup>c</sup> [&mu;K<sub>CMB</sub>]
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|width="320" | White noise level in timelines<sup>c</sup> [&mu;K<sub>CMB</sub> s<sup>1/2</sup>]
|width="100" | *TBD
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|width="100" | 147.9
|width="100" | *TBD
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|width="100" | 174.0
|width="100" | *TBD
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|width="100" | 151.9
 
|-
 
|-
|width="320" | White noise level in timelines<sup>d</sup> [&mu;K<sub>CMB</sub> s<sup>1/2</sup>]
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|width="320" | <i>f</i><sub>knee</sub><sup>c</sup> [mHz]
|width="100" | 148.1
+
|width="100" | 113.9
|width="100" | 174.2
+
|width="100" | 53.0
|width="100" | 152.0
+
|width="100" | 19.6
 
|-
 
|-
|width="320" | <i>f</i><sub>knee</sub><sup>d</sup> [mHz]
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|width="320" | 1/<i>f</i> slope<sup>c</sup>
|width="100" | 114.1
 
|width="100" | 52.4
 
|width="100" | 19.7
 
|-
 
|width="320" | 1/<i>f</i> slope<sup>d</sup>
 
 
|width="100" | -0.92
 
|width="100" | -0.92
 
|width="100" | -0.88
 
|width="100" | -0.88
 
|width="100" | -1.20
 
|width="100" | -1.20
 
|-
 
|-
|width="320" | Overall calibration uncertainty<sup>e</sup> [%]
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|width="320" | Overall calibration uncertainty<sup>d</sup> [%]
|width="100" | 0.35
+
|width="100" | 0.17
|width="100" | 0.26
+
|width="100" | 0.12
|width="100" | 0.29
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|width="100" | 0.20
|-
 
|width="320" | Systematic effects uncertainty in Stokes <i>I</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 0.88
 
|width="100" | 1.97
 
|width="100" | 1.87
 
|-
 
|width="320" | Systematic effects uncertainty in Stokes <i>Q</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 1.11
 
|width="100" | 1.14
 
|width="100" | 2.25
 
|-
 
|width="320" | Systematic effects uncertainty in Stokes <i>U</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 0.95
 
|width="100" | 1.29
 
|width="100" | 2.22
 
 
|-
 
|-
 
|}
 
|}
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 +
 
  
 
<sup>a</sup> Determined by fitting Jupiter observations directly in the timelines.
 
<sup>a</sup> Determined by fitting Jupiter observations directly in the timelines.
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<!-- {{PlanckPapers|planck2013-p05}} -->  
 
<!-- {{PlanckPapers|planck2013-p05}} -->  
  
<sup>c</sup> White noise per pixel computed from half-ring difference maps. These values are within 1% of the white noise sensitivity computed directly on the timelines, taking into account the actual integration time represented in the maps.
+
<sup>c</sup> Typical values derived from fitting noise spectra
 
 
<sup>d</sup> Values derived from fitting noise spectra.
 
 
 
<sup>e</sup> Sum of the error on the estimation of the calibration constant (0.25 %) and the square root of the squared sum of the following errors: beam uncertainty; sidelobe convolution effect; and unknown systematics as measured from the power spectrum at 50 < &#8467; < 250, see {{PlanckPapers|planck2014-a05}}.
 
<!-- {{PlanckPapers|planck2013-p02b}} -->
 
 
 
<sup>f</sup> Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps, see {{PlanckPapers|planck2014-a03}}.
 
<!-- {{PlanckPapers|planck2013-p02a}} -->
 
  
 +
<sup>d</sup> difference between first and last iteration of the iterative calibration (for 30 and 44 GHz) or E2E 2015 result (for 70 GHz). In 2015 the calibration uncertainity was 0.35% and 0.26% at 30 and 44, respectively.
  
  

Latest revision as of 16:00, 5 July 2018

Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper Planck-2020-A2[1].

Table 1. LFI performance parameters
Parameter 30 GHz 44 GHz 70 GHz
Centre frequency [GHz] 28.4 44.1 70.4
Bandwidth [GHz] 9.89 10.72 14.90
Scanning beam FWHMa [arcmin] 33.10 27.94 13.08
Scanning beam ellipticitya 1.37 1.25 1.27
Effective beam FWHMb [arcmin] 32.29 27.00 13.22
White noise level in timelinesc [μKCMB s1/2] 147.9 174.0 151.9
fkneec [mHz] 113.9 53.0 19.6
1/f slopec -0.92 -0.88 -1.20
Overall calibration uncertaintyd [%] 0.17 0.12 0.20


a Determined by fitting Jupiter observations directly in the timelines.

b Calculated from the main beam solid angle of the effective beam, Ωeff = mean(Ω). These values are used in the source extraction pipeline (Planck-2015-A26[2]).

c Typical values derived from fitting noise spectra

d difference between first and last iteration of the iterative calibration (for 30 and 44 GHz) or E2E 2015 result (for 70 GHz). In 2015 the calibration uncertainity was 0.35% and 0.26% at 30 and 44, respectively.


References[edit]

(Planck) Low Frequency Instrument

Full-Width-at-Half-Maximum

Cosmic Microwave background