  We report on the global temporal pulse characteristics of individual
harmonics in an attosecond pulse train by means of photo-electron streaking in
a strong low-frequency transient. The scheme allows direct retrieval of pulse
durations and first order chirp of individual harmonics without the need of
temporal scanning. The measurements were performed using an intense THz field
generated by tilted phase front technique in LiNbO_3 . Pulse properties for
harmonics of order 23, 25 and 27 show that the individual pulse durations and
linear chirp are decreasing by the harmonic order.
