rising flux tube properties

1
rising flux tube properties
thin flux tube calculations (Fan Gong 2000)

• two days before emergence
• depth z 60 Mm
• speed vr 150 m/s
• let diameter fz (f 1 !)
• travel-time perturbation

time
s

• rms of single corr. 10 s
• can get N100 correlations (maybe) error of
  mean 1s
• direct detection of vr (probably) unlikely, but?

va
vr (rise speed)
2
noise (15x60 averages)
1 x 1 (noise x 30) 5 x 5 (noise x 6)