  We present an extensive study on the X-ray intraday variability of ten
TeV-emitting high synchrotron peaked blazars (HBLs): 1ES 0229+200, 1ES
0414+009, PKS 0548-322, 1ES 1101-232, 1H 1219+301, H 1426+428, Mrk 501, 1ES
1959+650, PKS 2005-489, and 1ES 2344+514 made with twenty-five XMM-Newton
pointed observations during its operational period. Intraday variability has
been estimated in three energy bands: soft (0.3--2 keV), hard (2--10 keV) and
total (0.3--10 keV). Although seven out of these ten TeV HBLs exhibited some
intraday variability at three-sigma levels no major variations exceeding six
percent were detected. We explored the spectral properties of the sample by
extracting the hardness ratio from the soft and hard bands; no significant
variations in the hardness ratio were observed in any source. We performed
power spectral density analyses on the variable light-curves by fitting
power-laws, yielding slopes lying in the range from 1.11 to 2.93 for different
HBLs. We briefly discuss possible emission mechanisms and carry out rough
estimates for magnetic fields, electron Lorentz factors and emission region
sizes for seven of these HBLs.
