FINAL --Geospace Dynamics Constellation (GDC), a Program Appendix in the Third Stand Alone Missions of Opportunity Notice (SALMON-3)

This SAM notice is updated to 1) announce an amendment to the Final Text Geospace Dynamics Constellation (GDC), including a due date extension and 2) to add a PDF file of an NSPIRES email dated August 19, 2021. For summary details please download and carefully read the PDF file entitled "GDCsynopsisandNSPIRESemail8192021" or visit NSPIRES directly for the complete amended AO. This notice is amended to add a PDF copy of an NSPIRES email dated August 11, 2021 that anticipates due date extensions for both questions and proposals. For details please download and carefully read the PDF file entitled "ExtensionforthcomingNSPIRESemail". The National Aeronautics and Space Administration (NASA) announces that the Third Stand Alone Missions of Opportunity Notice (SALMON-3 NNH17ZDA004O), an omnibus Announcement of Opportunity, is amended to add a new Program Element Appendix (PEA) P for the purpose of soliciting proposals for a Heliophysics Focused Mission of Opportunity (FMO). On or after the posting date of this SAM.gov synopsis, the full, final text for the PEA P entitled “ Geospace Dynamics Constellation ” (GDC) may be downloaded from the NASA Solicitation and Proposal Integrated Review and Evaluation System (NSPIRES) https://nspires.nasaprs.com by searching on solicitation number “NNH17ZDA004O-GDC” or by using the direct link attached. There are other important and much earlier dates in addition to the listed proposal response date. Download, open and carefully read the attached PDF file entitled “GDCsynopsisandNSPIRESemail” for the detailed due dates for the mandatory notice of intent (NOI) to propose, etc. The period for questions will close three weeks before the proposal due date, and the period for responses will close 10 days before the proposal due date. Send questions (or other comments) with a subject line to read "GDC PEA" to the listed primary point of contact. Responses will be posted on the on NASA's Science Office for Mission Assessments (SOMA) GDC Acquisition Homepage at https://lws.larc.nasa.gov/gdc .