hydrogen lyman emission through the solar cycle

Northeast Harbor 2009 Werner Curdt 1

Hydrogen Lyman emission through the solar cycle

Co-workers:H. TianL. Teriaca

Werner CurdtMax-Planck-Institut für Sonnensystemforschung

Northeast Harbor 2009 Werner Curdt 2

Outline:

Motivation Irradiance data through the cycle

- Lyman alpha- other lines

Radiance data / line profiles- Lyman alpha- Lyman beta- Lyman continuum

The role of the magnetic field Conclusion

Northeast Harbor 2009 Werner Curdt 3

Multi-spacecraft observations (e.g., GOES, UARS, SOHO, SORCE)compilation by C. Fröhlich

spectral irradiances at 1 AU

X-rays1 - 8 Å

EUV30040 Å

Ly-12155 Å

UV1600 Å

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Ly- Ly-

Lemaire et al. 2005

Ly- and Ly- spectral irradiance variation

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Solar minimum1996

SOHO lost1998

solar spectral radiance variability

Schühle et al. (2000)

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June 24 and 26, 2008

June 25

July 2 (Ly- & Ly-)

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Ly- profile fordifferent- radiances- velocities

Curdt et al. 2008

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Ly- radiance / photons s-1 m-2

Ly-

r

adia

nce

Ly- / Ly- photon ratio = 188 1

significantly higher thanVernazza & Reeves (1978)Lemaire (2005)

cotemporal Ly- and Ly- data

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cotemporal Ly- and Ly- profiles

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B deep revearsal

A flat topped

Tian et al. 2009a

cotemporal rasters in Ly- and Ly-

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Center to limb variationin a polar coronal hole

Tian et al. 2009b

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CH QS, limb QS, disk

Xia 2003Tian et al. 2009b

Ly- and Ly- profiles of disk and CH emission

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radiance distributions of Ly-, Ly-, Si III, and O VI

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Tb = 6300 K

Tb = 7000 K

cotemporal radiance bins in QS Lyman continuum

Wilhelm & Kalkofen 2003

Te = 9900 K

Te = 8000 K

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quiet Sun

sunspot

Curdt et al. 2001

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?!

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