Context :

Aims : We investigate intensity oscillations observed simultaneously in the quiet chromosphere and in the corona , above an enhanced network area at the boundary of an equatorial coronal hole .

Methods : A Fourier analysis is applied to a sequence of images observed in the 171 Å and 1600 Å passbands of TRACE .
Four interesting features above the magnetic network are further investigated by using a wavelet analysis .

Results : Our results reveal that , in both the 171 Å and 1600 Å passbands , oscillations above the magnetic network show a lack of power at high frequencies ( 5.0-8.3 mHz ) , and a significant power at low ( 1.3-2.0 mHz ) and intermediate frequencies ( 2.6-4.0 mHz ) .
The global 5-min oscillation is clearly present in the 4 analyzed features when seen in the 1600 Å passband , and is also found with enhanced power in feature 1 ( leg of a large coronal loop ) and feature 2 ( legs of a coronal bright point loop ) when seen in the 171 Å passband .
Two features above an enhanced network element ( feature 3 and feature 4 ) show repeated propagating behaviors with a dominant period of 10 minutes and 5 minutes , respectively .

Conclusions : We suggest these oscillations are likely to be slow magneto-acoustic waves propagating along inclined magnetic field lines , from the lower solar atmosphere into the corona .
The energy flux carried by these waves is estimated of the order of 40 ~ { } erg~ { } cm ^ { -2 } ~ { } s ^ { -1 } for the 171 Å passband and is far lower than the energy required to heat the quiet corona .
For the 1600 Å passband , the energy flux is about 1.4 \times 10 ^ { 6 } ~ { } erg~ { } cm ^ { -2 } ~ { } s ^ { -1 } , which is about one third of the required energy budget for the chromosphere .