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ASHI: All Sky Heliospheric Imager

Bernard Jackson - Center for Astrophysics and Space Sciences; Andrew Buffington - Center for Astrophysics and Space Sciences, United States; Philippe Leblanc - Center for Astrophysics and Space Sciences, United States; Ed Stephan - Center for Astrophysics and Space Sciences, United States; Matthew Bracamontes - Center for Astrophysics and Space Sciences, United States; P. Paul Hick - Center for Astrophysics and Space Sciences, United States; Stephen Kahler - Air Force Research Laboratory, United States; Mario M. Bisi - UK Research and Innovation - Science & Technology Facilities Council - RAL-Space, United Kingdom

Space Weather Instrumentation


We have conceived, designed, and are now evaluating components for an All-Sky Heliospheric Imager (ASHI), to fly on future NASA missions. ASHI’s principal objective is the timely acquisition of a precision photometric map of the inner heliosphere. The instrument optical design views a hemisphere of sky starting a few degrees from the Sun. A key photometric specification for ASHI is 0.1% differential photometry in a one-degree sky bin at 90 degrees elongation. This enables the three dimensional (3-D) reconstruction of heliospheric density starting from near the Sun and extending outward, with updates as heliospheric structures approach, and pass the spacecraft. SMEI, and now STEREO HI imager analyses, have demonstrated the success of this technique: a similar analysis with ASHI data is expected to yield 3-D density reconstructions better than 2 x 2 degrees in latitude, and longitude, and 2-hour time resolutions near the spacecraft.

This July 2020 we were given a go-ahead by the Columbia Scientific Balloon Facility, Palestine Texas, and NASA, to prepare ASHI for a powered topside balloon test flight in the summer 2021. Here we present the latest results of the ASHI laboratory evaluations, and nighttime full-sky tests of the instrument data sets.



Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020