Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...559..491s&link_type=abstract
The Astrophysical Journal, Volume 559, Issue 1, pp. 491-500.
Astronomy and Astrophysics
Astronomy
4
Earth, Instrumentation: Interferometers, Interplanetary Medium
Scientific paper
We describe a Self-Compensating All-Reflecting Interferometer used to measure diffuse interplanetary H Lyα emission (λ~1216 Å) of interstellar origin at high spectral resolution (λ/Δλ~100,000). The instrument is capable of resolving the separation between the Doppler-shifted, interplanetary neutral H emission from the Earth's geocoronal emission line. We present the optical layout and mechanical design that enable the instrument to maintain alignment through a sounding rocket flight. We find an H Lyα spectrum, including both geocoronal emission and interplanetary scattered features, which we have fitted using Gaussian line profiles. The interplanetary H line is fitted with a 7900+/-2400 K line width. The geocoronal line width is fitted with a 1900+/-500 K Gaussian. The Doppler shift between the geocoronal and interplanetary line is 0.145 Å, corresponding to an apparent interplanetary wind velocity of 16+/-7 km s-1. We show how full line-profile measurements of interplanetary H emission can advance current studies of the heliospheric interface region and very local interstellar medium.
Chakrabarti Supriya
Cook Timothy
Cotton Daniel
Stephan Sherri Godlin
Vickers James
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