  Hinode discovered a beautiful giant jet with both cool and hot components at
the solar limb on 2007 February 9. Simultaneous observations by the Hinode SOT,
XRT, and TRACE 195 satellites revealed that hot (5x10^6 K) and cool (10^4 K)
jets were located side by side and that the hot jet preceded the associated
cool jet (1-2 minutes). A current-sheet-like structure was seen in optical (Ca
IIH), EUV (195A), and soft X-ray emissions, suggesting that magnetic
reconnection is occurring in the transition region or upper chromosphere.
Alfven waves were also observed with Hinode SOT. These propagated along the jet
at velocities of 200 km/s with amplitudes (transverse velocity) of 5-15 km/s
and a period of 200 s. We performed two-dimensional MHD simulation of the jets
on the basis of the emerging flux-reconnection model, by extending Yokoyama and
Shibata's model. We extended the model with a more realistic initial condition
(10^6 K corona) and compared our model with multiwavelength observations. The
improvement of the coronal temperature and density in the simulation model
allowed for the first time the reproduction of the structure and evolution of
both the cool and hot jets quantitatively, supporting the magnetic reconnection
model. The generation and the propagation of Alfven waves are also reproduced
self-consistently in the simulation model.
