The recent solar minimum how unprecedent is the sun s behavior
Download
1 / 27

The recent solar minimum How unprecedent is the Sun's behavior? - PowerPoint PPT Presentation


  • 88 Views
  • Uploaded on
  • Presentation posted in: General

University of Bern, 17th November 2010. The recent solar minimum How unprecedent is the Sun's behavior?. Andrea Opitz CESR (CNRS-UPS) University of Toulouse, France. Solar - terrestrial relations. Solar activity cycles. SOHO (NASA/ESA). Solar activity cycles.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

The recent solar minimum How unprecedent is the Sun's behavior?

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


University of Bern, 17th November 2010

The recent solar minimumHow unprecedent is the Sun's behavior?

Andrea Opitz

CESR (CNRS-UPS)

University of Toulouse, France


Solar - terrestrial relations


Solar activity cycles

SOHO (NASA/ESA)


Solar activity cycles

 Few hundred years of sunspot record available

David Hathaway, NASA Marshall Space Flight Center

 Space Age (1960's - today): just a few solar cycles, low statistics


SOHO/EIT (ESA/NASA)


Out-of-ecliptic view


SW velocity vs. latitude

Solar minimum

Solar maximum

Now

McComas et al. GRL 2008


In-ecliptic view


Twin STEREO spacecraft

Opitz, Karrer, Wurz et al. 2009 Solar Physics


STEREO PLASTIC

 SW bulk velocity

 SW temperature

 SW density

Group:

P. Bochsler, P. Wurz, R. Karrer, A. Opitz, L. Blush, H. Daoudi, J. Fischer, M. Sigrist et al. (UoBe)

A. B. Galvin, L. Kistler et al. (UNH)


Temporal evolution of the solar wind

Opitz et al. 2009, Solar Physics

PLASTIC proton velocity 

0.5 day: ~0.95

2 days: ~0.85

STA STB

Opitz et al. 2010, Solar Physics

SWEA electron density 

0.5 day: ~0.80

2 days: ~0.65

STA STB

SWEA


Temporal evolution by cross-correlation

STA STB

timelag of ~6 days

Riley, Luhmann, Opitz, Linker, and Mikic 2010 JGR


Recent Sun and solar wind observations: Facts

  • longer solar activity minimum

  • solar magnetic field weaker

  • coronal holes at low latitudes

  • recurrent stream structure broader

  • low solar wind densities

  • total solar irradiance lower


Solar activity minimum: longer

Russell, Luhmann, Jian et al. 2010


Solar polar magnetic field: weaker

red: South

blue: North

Wilcox Solar Observatory


SW velocity vs. latitude

Solar minimum

Solar maximum

Now

McComas et al. GRL 2008


Recurrent stream structure:stronger and broader

Gibson et al. 2009


Terrestrial response 1

  • Quiet solar minimum, though geoeffective.

  • Interaction of the strong, broad stream structures with the terrestrial magnetosphere.

  • Proof: sunspot number alone can not give a good prediction.


Solar irradiance

 TSI lower

 UV lower

 visible higher

Haigh 2007


Solar irradiance: EUV

Solomon et al. 2010


Terrestrial response 2

  • Opportunity to separate the climatic effects of solar and anthropogenic sources.

    • Total solar irradiance lower.

    • Spectral solar irradiance: UV lower, visible higher.

  • Maunder and Dalton minimums


Russell, Luhmann, Jian 2010


Solar maximum predictions

  • weaker

  • normal

  • stronger


Solar eruption risks

  • telegraph system collapsed in 1859

  • electric network collapsed in 1989

  • electric, oil and gas network

  • satellites: GPS, communication and scientific

  • pilots and astronauts

  • radio communication


Summary

  • longer solar activity minimum

  • solar magnetic field weaker

  • coronal holes at low latitudes

  • recurrent stream structure broader

  • low solar wind densities

  • total solar irradiance lower


Questions to the audience

  • How much does such an unprecedent solar behavior influence your work?

    • Climatology?

    • Planetology?

    • Cosmic rays?

    • Space instrumentation?

    • Solar and Stellar Physics?

Dr. Andrea OPITZ, CESR (CNRS-UPS), University of Toulouse, France


Acknowledgements

  • Cecile Bonneau: 'Science et vie' -> Nov/Dec 2010

  • Janet Luhmann: solar wind structures

  • STEREO PLASTIC: P. Bochsler, P. Wurz, R. Karrer, A. Opitz, L. Blush et al. (UoBe) + UNH


ad
  • Login