  Understanding the physical processes that trigger solar flares is paramount
to help with forecasting space weather and mitigating the effects on our
technological infrastructure. A previously unknown phenomenon was recently
identified in solar flares: the plasma temperature, derived from soft X-ray
(SXR) data, at the onset of four flares, was revealed to be in the range 10-15
MK, without evidence of gradual heating. To investigate how common the
hot-onset phenomenon may be, we extend this investigation to solar flares of
B1.2- X6.9 classes recorded by the X-ray Sensor (XRS) on-board the GOES-14 and
GOES-15 satellites between 2010 and 2011. For this statistical study, we
employed the same methodology as in recent work, where the pre-flare SXR flux
of each flare is obtained manually, and the temperature and emission measure
values are obtained by the flux ratio of the two GOES/XRS channels using the
standard software. From 3224 events listed in the GOES flare catalog for
2010-2011, we have selected and analyzed 745 events for which the flare
heliographic location was provided in the list, to investigate center-to-limb
effects of the hot-onset phenomenon. Our results show that 559 out of 745
flares (75%) exhibit an onset temperature above 8.6 MK (the first quartile),
with respective log10 of the emission measure values between 46.0 - 47.25 cm-3,
indicating that small amounts of plasma are quickly heated to high
temperatures. These results suggest that the hot-onset phenomenon is very
common in solar flares.
