English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We discuss the methods employed to photometrically calibrate the dataacquired by the Low Frequency Instrument on Planck. Our calibration is based ona combination of the Orbital Dipole plus the Solar Dipole, caused respectivelyby the motion of the Planck spacecraft with respect to the Sun and by motion ofthe Solar System with respect to the CMB rest frame. The latter provides asignal of a few mK with the same spectrum as the CMB anisotropies and isvisible throughout the mission. In this data release we rely on thecharacterization of the Solar Dipole as measured by WMAP. We also presentpreliminary results (at 44GHz only) on the study of the Orbital Dipole, whichagree with the WMAP value of the Solar System speed within our uncertainties.We compute the calibration constant for each radiometer roughly once per hour,in order to keep track of changes in the detectors' gain. Since non-idealitiesin the optical response of the beams proved to be important, we implemented afast convolution algorithm which considers the full beam response in estimatingthe signal generated by the dipole. Moreover, in order to further reduce theimpact of residual systematics due to sidelobes, we estimated time variationsin the calibration constant of the 30GHz radiometers (the ones with the largestsidelobes) using the signal of a reference load. We have estimated thecalibration accuracy in two ways: we have run a set of simulations to assessthe impact of statistical errors and systematic effects in the instrument andin the calibration procedure, and we have performed a number of consistencychecks on the data and on the brightness temperature of Jupiter. Calibrationerrors for this data release are expected to be about 0.6% at 44 and 70 GHz,and 0.8% at 30 GHz. (Abriged.)

Planck 2013 results. V. LFI calibration