The EUV spectral irradiance of the Sun from 1997 to date

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Presentation transcript:

The EUV spectral irradiance of the Sun from 1997 to date Giulio Del Zanna PPARC/STFC Adv. Fellow DAMTP, CMS, University of Cambridge Vincenzo Andretta OAC INAF, Italy Tom Woods, Phil Chamberlin et al., LASP, Univ. of Colorado, USA (Del Zanna et al. 2005,2006, 2009)

G. Del Zanna - UKSP/NAM/JENAM 2009 Key questions What is the EUV spectral irradiance and how it varies? Can we model it ? Does it affect our climate? The total irradiance is one of the main drivers for global climate. Variability exists but is small (0.2%) and insufficient to explain variations on global weather. EUV -- 1 MK X-ray -- 3-5 MK "Winter Scene with Frozen Canal" by Aert van der Neer SOHO TRACE Yohkoh G. Del Zanna - UKSP/NAM/JENAM 2009

CALIBRATION CALIBRATION CALIBRATION Why study UV and EUV ? UV radiation could be a significant driver for terrestrial climate (e.g. Haigh 1996). The EUV radiation creates the ionosphere and might also have an indirect effect. Spectral irradiance measurements: plenty in UV, almost none in X-rays and EUV (until TIMED 2002) EUV irradiances NASA TIMED/SEE UV irradiances CALIBRATION CALIBRATION CALIBRATION Source: LASP, Univ. of Colorado) G. Del Zanna - UKSP/NAM/JENAM 2009 Woods & Eparvier (2006)

G. Del Zanna - UKSP/NAM/JENAM 2009 CDS NIS G. Del Zanna - UKSP/NAM/JENAM 2009

SOHO CDS NIS: 1000 exposures sampling the whole Sun in 13 hours He I, O V (0.25), Mg X (1 MK), Fe XVI (2.5 MK) `Del Zanna minimum’ ? G. Del Zanna - UKSP/NAM/JENAM 2009

SDO EVE prototype ‘It could take a lifetime to understand such a spectrum’ (P.J.Storey, UCL) Woods et al. (GRL, 2009) Chamberlin et al. (GRL, 2009) G. Del Zanna - UKSP/NAM/JENAM 2009

SOHO NIS irradiances vs. EVE prototype SDO/EVE G. Del Zanna - UKSP/NAM/JENAM 2009

G. Del Zanna - UKSP/NAM/JENAM 2009 CDS NIS irradiances G. Del Zanna - UKSP/NAM/JENAM 2009

Summary and further work SDO EVE vs. NIS radiances The irradiances in lines formed in the low transition region have changed little (max 50%) over the last 12 years (also from late 60’s). At 1 MK by a factor of 5 and at 2.5 MK by a factor of 40. Further work: Explain the Sun-as-a-Star and other stars in XUV with radiance measurements. Improve predictions of EUV radiances and irradiances (current models use proxies: does not work!): - climate models - back in time. thank you B2/ G. Del Zanna - UKSP/NAM/JENAM 2009