Thanks for the heads-up, Dennis. My sadness at the end of the mission is tempered by the knowledge that this was an incredibly successful Explorer. Congratulations to the entire team!

On Aug 9, 2018, at 1:56 PM, Dennis, Brian R. (GSFC-6710) brian.r.dennis@nasa.gov wrote:

After more than 16 years of successful operations, the RHESSI spacecraft is now planned to be decommissioned on October 1 of this year. The on-board receiver has been slowly degrading since 2017, and commanding from the ground has become increasingly difficult to the point where we have not had a successful command since mid-July. We will continue to try to establish contact, but success is very unlikely. The spacecraft has no further scheduled transmissions and is programmed to automatically decommission itself on October 1.

Because of the communication difficulty, the detectors have not been turned back on following the sixth anneal, which started on April 12. Observations ended on April 11 at 01:50 UT and the last flare in the RHESSI catalog was a B5 on March 3. We have already started implementing the Mission Archive Plan as described in the latest RHESSI Senior Review Proposal (http://hesperia.gsfc.nasa.gov/senior_review/2017/senior_review_proposal_2017... http://hesperia.gsfc.nasa.gov/senior_review/2017/senior_review_proposal_2017.pdf). For the next few years, RHESSI data products will continue to be accessible on the usual servers. In the future, the archive will be available through the Solar Data Analysis Center (SDAC).

Sam Krucker, PI krucker@ssl.berkeley.edu mailto:krucker@ssl.berkeley.edu

Brian Dennis, Mission Scientist brian.r.dennis@nasa.gov mailto:brian.r.dennis@nasa.gov

Albert Shih, Deputy Mission Scientist albert.y.shih@nasa.gov mailto:albert.y.shih@nasa.gov

Dear Sa'm, Brian and Albert,

At the decommissioning of RHESSI, my sincere congratulations to you on the great success of the mission!

I feel that the document: "The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)", made for the Heliophysics Senior Review 2017, is an amazing document that reflects the results of so many years of observing, thinking and interpreting.

I am proud that I could participate hardware-wise in the realization of this successful mission.

Frank van Beek, the Netherlands.

From: RHESSI_data_analysis [mailto:rhessi_data_analysis-bounces@mithra.physics.montana.edu] On Behalf Of Dennis, Brian R. (GSFC-6710) Sent: Thursday, August 9, 2018 21:57 To: mmscience@solar.physics.montana.edu; rhessi_data_analysis@solar.physics.montana.edu Cc: Samuel KRUCKER; Shih, Albert Y. (GSFC-6710) Subject: RHESSI to be Decommissioned

After more than 16 years of successful operations, the RHESSI spacecraft is now planned to be decommissioned on October 1 of this year. The on-board receiver has been slowly degrading since 2017, and commanding from the ground has become increasingly difficult to the point where we have not had a successful command since mid-July. We will continue to try to establish contact, but success is very unlikely. The spacecraft has no further scheduled transmissions and is programmed to automatically decommission itself on October 1.

Because of the communication difficulty, the detectors have not been turned back on following the sixth anneal, which started on April 12. Observations ended on April 11 at 01:50 UT and the last flare in the RHESSI catalog was a B5 on March 3. We have already started implementing the Mission Archive Plan as described in the latest RHESSI Senior Review Proposal

(http://hesperia.gsfc.nasa.gov/senior_review/2017/senior_review_proposal_201 7.pdf).

For the next few years, RHESSI data products will continue to be accessible on the usual servers. In the future, the archive will be available through the Solar Data Analysis Center (SDAC).

Sam Krucker, PI

krucker@ssl.berkeley.edu

Brian Dennis, Mission Scientist

brian.r.dennis@nasa.gov

Albert Shih, Deputy Mission Scientist

albert.y.shih@nasa.gov

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