NOAA L1 Status and Studies

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Presentation transcript:

NOAA L1 Status and Studies D.A. Biesecker1, D. Socker2 1NOAA/SWPC, 2DOD/NRL

Outline NOAA’s History at L1 NOAA’s Future at L1 Coronagraph ACE DSCOVR NOAA’s Future at L1 SWFO Coronagraph Requirements Requirements justification Cosmic Ray scrubbing Gap-filler

NOAA’s L1 History (ACE & DSCOVR) 1993: NOAA Deputy AA provided funds for RTSW effort 1998: ACE became ‘operational’ for SWPC on 21 Jan 1998 2008: NOAA & USAF funded NASA to pull DSCOVR out of storage 2015: DSCOVR launched 11 Feb 2015 2016: DSCOVR became operational for SWPC 27 Jul 2016

After DSCOVR comes SWFO NOAA Space Weather Follow-on Program to follow DSCOVR at L1 Highlights of the planned mission are: Total 10 year operational mission Two identical spacecraft for long-term continuity Launches planned for 2022 and 2027 Addition of a coronagraph – Compact Coronagraph (CCOR) Addition of a suprathermal ion sensor (e.g. ACE/EPAM) 10 keV - 2 MeV Improved plasma measurements for meeting more stringent user requirements – high plasma velocity (V=2500 km/s)

Compact Coronagraph (CCOR) NRL is in Phase A System Requirements Review/Concept Design Review held Feb 16, 2017 Phase B begins in April 2017

L1 In-situ Requirements Parameter Threshold Objective Magnetic Field Vector Measurement Cadence 1 vector per minute 1 vector per second Magnetic Field Range 0 to ±200 nT along each axis   Accuracy ±1 nT up to 100 nT 1% for measurement > 100 nT Plasma Ion Velocity, Density, and Temperature 1 measurement per minute 1 measurement per second Velocity Range 200 to 2500 km/s Density Range 0.1 to 150 particles per cm^3 Temperature Range 40,000 to 2,000,000 K Low Energy Ion Particle Population 1 measurement every 5 minutes Energy Range 10 to 2,000 keV Spectral Resolution 5 differential flux channels per decade L1 Requirements Workshop held in 2014 In-situ and imaging sessions held in parallel Requirements (extended range) now cover extreme space weather

Coronagraph Requirements Field of view range ΔFOV function of: # of CME images CME speed sampling frequency Assume fastest CME 3400 km/s (cf. LASCO catalog) ΔFOV = (3*3400km/s*15min) =13.2 Rsun Parameter Threshold Objective Field of View 3.7-17 RSUN 3-25 RSUN Pointing Knowledge 25 arcsec 12.5 arcsec Knowledge of Solar North 1 degree 0.5 degree Spatial Resolution 50 arcsec (at average of the inner and outer radii of the FOV)   Photometric Accuracy 10% Image Cadence 15 minutes 5 minutes Data Latency* *Data Latency is defined as the time from the end of the final exposure in an image, or image sequence, to the time the level 3 processed data are available to forecasters.

CCOR will see through the ‘clouds’ Current state of the art (COR2) CCOR COR2 CME CME + SEP storm CME+SEP STORM STEREO-A COR2 Image of CME (01/27/2012) 90% of pixels effected 90% of pixels effected Using scrub algorithm

Nominal CCOR Image Quality & Performance COR2 SEP free CME 75% Contamination No Scrub With Scrub 97% of all pixel samples contaminated

CCOR Scrub Algorithm For Each Pixel, Go through the Stack of 30 and find the smallest value Histogram graph of values edit font size Use the minimum pixel value to construct a tolerance for each pixel stack and search for other usable values Using algorithm run time in C and a series of benchmark programs (whetstone, dhrystone) a 3 minute run-time for CCOR flight computer is estimated.

Gap-Filler Coronagraph SOHO is nearing the end of it’s lifetime 1000 Watts needed to recover from safe mode SWFO launch planned for 2022 Risk of no coronagraph data NOAA exploring options for a CCOR tech demo deployment ~2019 e.g. RFI released in 2016

Summary Space Weather Follow On, with the first launch in 2022, represents NOAA’s intent to provide continuous monitoring of solar wind data from L1 It also represents the first operational coronagraph Mission definition for SWFO is at a very preliminary stage Loss of SOHO before SWFO is operational is a real risk that NOAA is taking seriously