J.G. Doyle
and
E. O'Shea
|
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D. Banerjee
J.G. Doyle and
E. O'Shea
Armagh Observatory,
Armagh, BT61 9DG, N. Ireland
Dept. of Pure
& Applied Phys., Queens University Belfast, Belfast BT7 1NN, N. Ireland
The power spectra for line intensities of lower chromospheric lines
N I 1319 Å\ and C II 1335 Å are presented. On a number of occasions,
intensity oscillations were seen to occur in N I at 
3.7 mHz while C II over the same spatial location showed oscillations close
to 
2.7 mHz.
In a network region, the C II line intensity was time-delayed by 
1
min., compared to the N I line intensity. For network regions, the 5 min.
intensity oscillations observed in N I are often accompanied with a blue-shifted
line profile of 2--3 km s
.
These oscillations can be interpreted in terms of kink and sausage waves
propagating upwards along thin magnetic flux tubes. These waves can be
generated by random foot-point motions driven by exploding granules at
the photospheric level.
Key words: Sun; chromospheric oscillations; SOHO; waves.