The Solar Radius in the EUV during the Cycle XXIII

Details The Solar Radius in the EUV during the Cycle XXIII The Solar Radius in the EUV during the Cycle XXIII

2007-06-20

arxiv.org/abs/0706.3032v2

Astronomy and Astrophysics

Astrophysics

accepted for publication in Astronomy & Astrophysics minor changes introduced during review process

Scientific paper

10.1051/0004-6361:20078118

Aims. To determine the solar transition region and coronal radius at EUV wavelengths and its time evolution during Solar Cycle XXIII. Methods. We use daily 30.4 and 17.1 nm images obtained by the Extreme Ultraviolet Imager (EIT) aboard the SoHO satellite and derive the solar radius by fitting a circle to the limb brightness ring. Results. The weighted mean of the temporal series gives (967''.56 +/- 0''.04) and (969''.54 +/- 0''.02) at 30.4 and 17.1 nm respectively. No significant correlation was found with the solar cycle at any of the two wavelengths. Conclusions. Since the temperature formation of the 30.4 nm line is between (60 - 80) 10^3 K (Transition Region), the obtained result is bigger than that derived from present atmospheric models. On the contrary this height is compatible with radio models.

Affiliated with

Also associated with

No associations

Rating

The Solar Radius in the EUV during the Cycle XXIII does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Solar Radius in the EUV during the Cycle XXIII, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Solar Radius in the EUV during the Cycle XXIII will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-34710