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CNES has scheduled the launch of PICARD microsatellite in October 2008. - PowerPoint PPT Presentation


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THE PICARD MISSION and ITS SYNERGY WITH THE HELIOSEISMIC and MAGNETIC IMAGER Gérard Thuillier 1 , Judit Pap 2 , and Sabatino Sofia 3. (3) Yale university HAO (2) GSFC JPL NRL Valencia U. (1) SA (F) IRMB (B) PMOD (Ch) OCA Nice University IAS LMD. ILWS.

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slide1

THE PICARD MISSION and ITS SYNERGY WITH

THE HELIOSEISMIC and MAGNETIC IMAGER

Gérard Thuillier1, Judit Pap2, and Sabatino Sofia3

(3) Yale university

HAO

(2) GSFC

JPL

NRL

Valencia U

(1) SA (F)

IRMB (B)

PMOD (Ch)

OCA

Nice University

IAS

LMD

ILWS

CNES has scheduled the launch of PICARD microsatellite in October 2008.

slide2

PICARD MISSION MAIN SCIENTIFIC OBJECTIVES

  • (1) Measure the variability of several global solar properties. In particular, the solar diameter with a metrological instrument.
    • (2) Modelling of the solar machine
    • Role of the magnetic field, on surface or deeper in the convective zone.
    • (3) Contribution to solar luminosity reconstruction
    • (4) Long term trend
    • (5) Understanding of the ground based measurements
slide3

Key constraints for validating the physics of solar models are simultanously measured by PICARD:

- solar diameter, limb shape, asphericity in the photosphere

- total solar irradiance

- oscillation modes

- Temperature variations in the photosphere

 HMI and PICARD have a strong synergy

slide4

Photospheric diameter Measurements

From ground observations, there are several optical methods (Mercury transits, eclipses, astrolabes, imaging telescope) showing:

- in phase, or anti phase with the 11-year solar cycle, or no variation.

 contradictory results

MDI/SoHO images are used to determine the radius variation as a function of time. The recent results show a maximum change of 15 mas per year (Kuhn et al., 2004).

MDI is not a metrological instrument, as having no internal means to control the instrument angular scale. Corrections by models were made.

slide5

DIAMETER VARIATION FROM

STRATOSPHERIC BALLOON OBSERVATIONS

Sofia et al. (1994) have built the Solar Disk Sextant (SDS) using an angular reference. Operated on board a stratospheric balloon, several flights were achieved.

Results of four stratospheric balloons flights carrying SDS (Egidi et al., 2006) showing a diameter increase of 0.2“ while the solar activity decreases.

SDS

Calern

slide6

Sofia et al, 2005

Avec turbulence,

diamètre et activité

sont en antiphase

Sans turbulence,

diamètre et activité

sont en phase

No turbulence

Sofia et al., 2005

With turbulence

2 4 6

Depth (Mm)

slide7

THE PICARD MISSION MEASUREMENTS

In orbit:

Diameter, limb shape and asphericity in the continuum

(535, 607, 782 nm). Diameter (215 nm) refered to stars

doublets

Precision: 3 mas per single image

TSI: 2 independent radiometers as on SoHO

5 spectral channels (2 in UV relevant of ozone photochemistry)

Activity (215 nm, Ca II)

Solar oscillations (535 nm)

on the ground :

- diameter, limb shape and asphericity,

- local atmospheric turbulence

slide8

Mission

2006

2007

2008

2009

2010

2011

SoHO

SORCE

SOLAR B

STEREO

ISS

PROBA 2

SDO

PICARD

NPOESS

SOHO: TSI, images in visible, UV et EUV, magnetograms, helioseismology.

SORCE: TSI and solar spectrum from 12 to 2500 nm.

SOLAR B : X-Rays-X and EUV

STEREO: CME

SOLAR/ISS: TSI and solar spectrum from 17 to 3000 nm.

PROBA 2: EUV image, EUV spectral irradiances

SDO: EUV, magnetograms, heliosismologie, images @ several wavelengths

PICARD: TSI, diameter, asphericity, helioseismology

NPOESS: TSI and minor components concentration measurements.

slide9

SYNERGY HMI/PICARD

PICARD will ensure continuity with SoHO and SORCE for TSI measurements.

Diameter, asphericity, limb shape in three photospheric spectral domains

Spectral irradiance in UV, visible and near IR

Activity in near UV and CaII line

Temperature variation

Helioseismology measurements (limb, macropixels, and spectral channels).

slide10

SODISM I : diameter measurement in orbit. SODISM II, on ground

SOVAP and PREMOS : measurement of the Total Solar Irradiance (TSI)

PREMOS : measurement in 5 spectral domains