  We probe the spectral hardening of solar flares emission in view of
associated solar proton events (SEPs) at earth and coronal mass ejection (CME)
acceleration as a consequence. In this investigation we undertake 60 SEPs of
the Solar Cycle 23 alongwith associated Solar Flares and CMEs. We employ the
X-ray emission in Solar flares observed by Reuven Ramaty Higly Energy Solar
Spectroscopic Imager (RHESSI) in order to estimate flare plasma parameters.
Further, we employ the observations from Geo-stationary Operational
Environmental Satellites (GOES) and Large Angle and Spectrometric Coronagraph
(LASCO), for SEPs and CMEs parameter estimation respectively. We report a good
association of soft-hard-harder (SHH) spectral behavior of Flares with
occurrence of Solar Proton Events for 16 Events (observed by RHESSI associated
with protons). In addition, we have found a good correlation (R=0.71) in SEPs
spectral hardening and CME velocity. We conclude that the Protons as well as
CMEs gets accelerated at the Flare site and travel all the way in
interplanetary space and then by re-acceleration in interplanetary space CMEs
produce Geomagnetic Storms in geospace. This seems to be a statistically
significant mechanism of the SEPs and initial CME acceleration in addition to
the standard scenario of SEP acceleration at the shock front of CMEs.
