From the launch to the end of the 2018 July, CSES underwent a set of “commissioning tests”. All parameters were found nominal, both for the satellite and instruments.

In August 2018 the scientific data taking of CSES-01 started. Results by the various instruments have been presented at the 4th CSES satellite workshop, Changsha, Cina.

The first HEPD-01 results have been published in the article “Scientific Goals and In-orbit Performance of the High-energy Particle Detector on Board”, P. Picozza et al., The Astrophysical Journal Supplement Series, 243:16 (17pp), 2019 July.

The particles detected by HEPD-01 include solar and galactic particles, particles trapped in the inner and outer radiation belts, including SAA, and albedo particles.



  Left side: HEPD-01 average event-rate map during the period from May 14 to June 11, 2018. The red spot around Brazil represents the SAA, in which the rate counter saturates at about 350 Hz. Right side: HEPD trigger rate as a function of onboard time for a few orbits. Different regions are marked.


HEPD-01 counting rate for different trigger configurations


In-flight proton-electron identification by HEPD-01: energy released in the first scintillatir plane of the calorimeter (P1) as a function of the energy released in the plastic scintillator tower. LYSO is not included.