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Proc. of SOHO 13 `Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE', Palma de Mallorca, Balearic Islands (Spain), 29 September 3 October 2003 (ESA SP-547, January 2004)
 

Summary: Proc. of SOHO 13 `Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE',
Palma de Mallorca, Balearic Islands (Spain), 29 September 3 October 2003 (ESA SP-547, January 2004)
A STUDY OF TRANSITION REGION AND CORONAL DOPPLER SHIFTS IN A SOLAR CORONAL HOLE
M. D. Popescu 1,2
and J. G. Doyle 1
1
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
2
Astronomical Institute of the Romanian Academy, RO-75212 Bucharest 28, Romania
ABSTRACT
We present a study of a high spatial resolution raster scan
taken on-disk with the SoHO/SUMER spectrograph in
a solar polar Coronal Hole (CH) region. We have anal-
ysed the line shifts and widths of two EUV emitting ions,
O III 703.87 and Mg IX 706.02 . Our results confirm
plasma outflows from CHs. In particular, the correlation
between the intensity and the Doppler velocity in the case
of the O III line constitute the lowest precise indication
of fast wind streams seen originating from the network
boundaries in the transition region.

  

Source: Armagh Observatory

 

Collections: Physics