Reuven Ramaty1937 – 2001

RHESSI people

• UC Berkeley (Bob Lin)

• NASA GSFC (Brian Dennis)

• Paul Scherrer Institute (Alex Zehnder)

• Co-Is Benz, Brown, Emslie, Enome, Hudson, Hurford, Kosugi, Ramaty, Smith, Vilmer (Aschwanden? Holman? Krucker?)

RHESSI description

• A NASA Small Explorer (the 6th SMEX)• Spin-stabilized modulation collimator array

in low Earth orbit• Germanium detectors for high resolution X-

ray and -ray imaging spectroscopy• Launched successfully February 6, 2002• All data and software public-domain. The

GUI really works.

Three RHESSI items

• Interplanetary connection

• Gamma-ray flare (July 23, 2002)

• Late arcade development (April 21, 2002)

Coronal connectivity via SEPs

Slide 16Slide 16

Courtesy of Brian Dennis

July 23, 2002, -ray event

Krucker et al. 2003

Hurford et al. 2003

Centroids of bremsstrahlung and 2.223 MeV emissions

April 21, 2002 “slow LDE”

Gallagher et al., 2002