Long Lifetime Oscillations

During each cycle, a wave may transfer a portion of its energy to the surroundings. Hence, any long-lifetime oscillations, which undergo several complete cycles, are good candidates for chromospheric heating. In all the UV passbands, in both the network and internetwork, all the LLOs occur near the acoustic band. At longer periods, oscillations tend to last for fewer cycles, and are even more transient at shorter periods. These LLOs never recur in the same place in both blocks of the data (Tables 6.2 & 6.3). This suggests that the source, in driving the LLO, no longer has sufficient energy to create further oscillations (or if it does create further oscillations, they will be too weak or have short lifetimes, hence will not be detected). Of course it may be that LLOs do recur, but more than 111 minutes (167 x 40.05> s) apart. It is also noted that the lower HOF passbands (1700 Å,1600 Å) contain more LLOs than the upper passbands, and whereas 1.5-2.0% of network pixels contains LLOs, only 0.05% of internetwork pixels display LLOs. Further studies of more LLOs are necessary to confirm these effects.