ICRR seminar
Saku Tsuneta
Hinode Science Center (HSC) & Advanced Technology Center (ATC)
in National Astronomical Observatory of Japan
Date and time:
January 25 (Wed), 15:30-
"Magnetic Universe as revealed with solar observation satellite Hinode"
It is a fascinating fact that a solitary star like the Sun emits intense
X-rays from its outer atmosphere. Observations with Yohkoh satellite showed
that all the sporadic heating from large flares to ubiquitous tiny bursts in
the solar corona is due to magnetic reconnection. Magnetic fields do
dissipate in the solar corona with a time scale 10(12) faster than that of
the classical Ohmic dissipation. Though this leads to an attractive
conjecture that the solar corona is heated by nano-bursts as initially
proposed by Gene Parker, the precise mechanism for the heating the solar
corona and chromosphere is not known. These activities on the surface of the
star are driven by magnetic fields created by internal dynamo mechanism. The
magnetic field strength on the surface of the Sun exceeds 1kG, while that at
the bottom of the convection zone may exceed 100kG. They are too strong, far
stronger than the equi-partition magnetic field strength. Any dynamo
mechanism can amplify field strength upto the equi-partition field strength,
but we had not known a mechanism to produce field strength beyond that
threshold. The concept of Hinode satellite is that two X-ray and EUV
telescopes observe the dissipation part of the magnetic life-cycle, while
the visible light telescope simultaneously observes the generation and
transport of magnetic field. Discoveries with Hinode include transverse MHD
waves, local dynamo process in the convection zone, convective collapse
resulting in super equi-partition magnetic field strength, emergence of
large-scale flux rope from below the photosphere, kG-magnetic patches in the
polar regions, identification of the origin of slow solar wind, and
enigmatic fine-scale flows in the prominence. I will present and discuss how
some of these new results from Hinode are probing fundamental physical
processes that will have applications in many other scenarios across the
universe. Finally, I will introduce SOLAR-C and SOLAR-D missions with our
roadmap in solar and helio-physics.