First Assessment of Mountains on Northwestern Ellesmere Island, Nunavut, As Potential Astronomical Observing Sites
Preprint, November 8, 2018 First Assessment of Mountains on Northwestern Ellesmere Island, Nunavut, as Potential Astronomical Observing Sites Eric Steinbring1, Ray Carlberg2, Bryce Croll2 Greg Fahlman1, Paul Hickson3, Liviu Ivanescu4, Brian Leckie1, Thomas Pfrommer3 & Matthias Schoeck1 ABSTRACT Ellesmere Island, at the most northerly tip of Canada, possesses the highest mountain peaks within 10 degrees of the pole. The highest is 2616 m, with many summits over 1000 m, high enough to place them above a stable low-elevation thermal inversion that persists through winter darkness. Our group has studied four mountains along the northwestern coast which have the additional benefit of smooth onshore airflow from the ice-locked Arctic Ocean. We deployed small robotic site testing stations at three sites, the highest of which is over 1600 m and within 8 degrees of the pole. Basic weather and sky clarity data for over three years beginning in 2006 are presented here, and compared with available nearby sea-level data and one manned mid-elevation site. Our results point to coastal mountain sites experiencing good weather: low median wind speed, high clear-sky fraction and the expectation of excellent seeing. Some practical aspects of access to these remote locations and operation and maintenance of equipment there are also discussed. Subject headings: site testing arXiv:1007.1680v1 [astro-ph.IM] 9 Jul 2010 1. Introduction The cold, dry, dark winter skies of the earth’s polar regions are well suited for astronomy. Smooth airflow is aided by a highly stratified atmosphere with strong, stable low-elevation 1Herzberg Institute of Astrophysics, National Research Council Canada, Victoria, BC V9E 2E7, Canada 2University of Toronto, Dept.
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