SIHLA - Spatial/Spectral Imaging of Hydrogen Lyman Alpha

Paper number

IAC-19,B4,2,2,x54954

Author

Dr. Larry Paxton, United States, The John Hopkins University Applied Physics Laboratory

Coauthor

Dr. Elena Provornikova, United States, Johns Hopkins University Applied Physics Laboratory

Coauthor

Ms. Ann Cox, United States, Johns Hopkins University Applied Physics Laboratory

Coauthor

Dr. Edmond Roelof, United States, The John Hopkins University Applied Physics Laboratory

Coauthor

Dr. Ralph McNutt, United States, The John Hopkins University Applied Physics Laboratory

Coauthor

Prof. Mike Gruntman, United States, Viterbi School of Engineering, USC

Coauthor

Prof. Vladimir Izmodenov, Russian Federation, Russian Academy of Sciences / Lomonosov Moscow State University

Coauthor

Prof. Olga Katushkina, Russian Federation, Russian Academy of Sciences / Lomonosov Moscow State University

Coauthor

Prof. Eric Quemerais, France, CNRS - LATMOS

Coauthor

Prof. Edwarnd Mierkiewicz, United States, Embry-Riddle Aeronautical University

Coauthor

Prof. Makoto Taguchi, Japan

Coauthor

Dr. SHILA Team, United States

Coauthor

Mr. Igor Baliukin, Russian Federation, Space Research Institute (IKI), Russian Academy of Sciences (RAS)

Year

2019

Abstract

SIHLA is a small satellite mission proposed as a Mission of Opportunity to NASA for flight on the same launch as the NASA IMAP mission. SIHLA is a free-flyer that is carried into a geosynchronous transfer orbit (GTO) on the ESPA-Grande ring. The SIHLA spacecraft flies to the L1 point. From there SIHLA will map the distribution of H in the heliosphere.
SIHLA takes an existing scanning imaging spectrograph (SIS) and adds a Hydrogen Absorption Cell (HAC). From the L1 point, outside of the Earth’s atmosphere and H exosphere, SIHLA is able to map the sky without the absorption of the terrestrial H. The SIS  produces spectral images from 115nm to 180 nm – including the H Lyman $\alpha$ line – at all points in the sky. SIHLA uses the HAC, and our observing geometry, to sample, over time, the entire H Lyman $\alpha$ lineshape. The line-of-sight integrated lineshape contains within it information on the density, temperature and velocity of Heliospheric H. Remote sensing measurements from SIHLA, and our international team, continue the legacy of SOHO/SWAN into the next solar cycle. SIHLA’s enhanced capabilities will provide new insights into the Heliospheric boundary and the processes that shape the distribution of H within the heliosphere. These new and unique observations from SIHLA, together with IMAP and Voyager 2, will lead to a revolution in our understanding of the ISM-Heliosphere interaction.

Abstract document

IAC-19,B4,2,2,x54954.brief.pdf

Manuscript document

IAC-19,B4,2,2,x54954.pdf (🔒 authorized access only).

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