ON 3 SEPTEMBER 2015 THE CHROMOSPHERIC LYMAN ALPHA SPECTROPOLARIMETER (CLASP) ON-BOARD A NASA/MSFC SOUNDING ROCKET SUCCESSFULLY OBSERVED THE SUN IN HYDROGEN LYMAN ALPHA (121.6 NM) FOR ABOUT 5 MINUTES. THE CLASP OBSERVATIONS REPRESENT A UNIQUE DATASET AS THE INSTRUMENT CAPTURED MEASUREMENTS OF THE SOLAR LYMAN ALPHA LINEAR POLARIZATION FOR THE FIRST TIME. THE LINE IS FORMED IN THE UPPER CHROMOSPHERE/LOWER TRANSITION REGION A CRUCIAL REGION FOR UNDERSTANDING WHERE CORONAL STRUCTURES ARE ROOTED AND HOW ENERGY IS RELEASED INTO THE OUTER ATMOSPHERE. THE LINEAR POLARIZATION SIGNAL IN LYMAN ALPHA IS GENERATED BY SCATTERING PROCESSES AND IS SENSITIVE TO THE HANLE EFFECT I.E. THE MODIFICATION OF THE POLARIZATION STATE IN THE PRESENCE OF MAGNETIC FIELDS. THE DATA PROVIDE UNIQUE INSIGHT INTO THE THERMAL AND MAGNETIC STRUCTURING IN THE UPPER CHROMOSPHERE. ADDITIONALLY FUTURE ASSESSMENTS OF PREDICTIONS FROM MHD SIMULATIONS WILL BENEFIT FROM INCLUDING THE CLASP MEASUREMENTS. THE CLASP DATA WERE TAKEN WITH THREE CAMERAS: A SLIT-JAW CONTEXT IMAGER AND TWO SPECTROGRAPH CAMERAS RECORDING THE LINEAR POLARIZATION SIMULTANEOUSLY AT PERPENDICULAR ANGLES. DURING THE FLIGHT THE INSTRUMENT FIRST POINTED TO A REFERENCE LOCATION AT DISK CENTER FOR 20 SECONDS AND THEN POINTED NEAR THE LIMB FOR THE REMAINDER OF THE OBSERVATION TO COVER A WIDE RANGE OF HELIOCENTRIC ANGLES WITH THE 400 ARCSEC LONG SLIT. THE CLASP DATA HAVE BEEN CALIBRATED (DARK SUBTRACTION FLAT FIELDING AND GAIN CORRECTION CO-ALIGNMENT POLARIZATION DEMODULATION) AND WRITTEN OUT AS FITS FILES FOR INTERNAL USE WITHIN THE CLASP SCIENCE TEAM. IN ORDER TO PUBLISH THE DATA AND TO MAKE IT ACCESSIBLE USABLE AND COMPREHENSIBLE FOR THE COMMUNITY THE FOLLOWING TASKS NEED TO BE CARRIED OUT AND ARE PROPOSED FOR THIS SUBMISSION: A) ADDITIONAL CALIBRATION STEPS B) EXTENSION AND IMPROVEMENT OF THE METADATA CONTAINED IN THE FITS HEADERS IN PARTICULAR REGARDING THE COMPLIANCE FOR THE SPACE PHYSICS ARCHIVE SEARCH AND EXTRACT (SPASE) DATA MODEL THE NASA HELIOPHYSICS DATA CENTERS (SPDF/SDAC) AND THE VIRTUAL SOLAR OBSERVATORY (VSO); C) INCLUSION OF THE DATA INTO THE AFOREMENTIONED ARCHIVES FOR PUBLIC DISSEMINATION; D) DEVELOPMENT OF INSTRUMENT-SPECIFIC SOFTWARE ROUTINES FOR EXTERNAL USERS TO READ IN THE DATA AND PRODUCE HIGHER LEVEL DATA PRODUCTS; E) IN-DEPTH PHOTON ERROR-BUDGET ANALYSIS WHICH WILL ALSO BE APPLICABLE TO THE FUNDED SUCCESSOR MISSION CLASP2; F) DOCUMENTATION FOR ALL PRECEDING TASKS. CLASP IS AN IMPORTANT STEP IN ASSESSING SUITABLE SPECTRAL LINES FOR USE IN A POTENTIAL FUTURE SATELLITE MISSION TO DETECT AND MEASURE THE CHROMOSPHERIC MAGNETIC FIELD. SCIENTIFIC ADVANCEMENT THROUGH ANALYSIS AND COMPARISON TO SIMULATIONS IS ALREADY UNDERWAY WITHIN THE EXTENDED CLASP TEAM BUT THE UTILITY OF THE DATA CAN BE ENHANCED WHEN RELEASED TO THE COMMUNITY. THIS HDEE PROPOSAL WILL RESULT IN A WELL-COORDINATED RELEASE OF DATA PRODUCTS THAT ARE EASY TO ACCESS AND COMPREHEND. WE WILL CAREFULLY RECORD THE CALIBRATION STEPS TAKEN AND THE ERROR ASSOCIATED WITH EACH MEASUREMENT SIMPLIFYING THE INTERPRETATION OF THE DATA FOR EXTERNAL USERS FOR A QUICKER SCIENCE RETURN.
$49,021FY2020National Aeronautics and Space AdministrationNASA
Universities Space Research Association, Washington DC