Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 225 GHz Atmospheric Opacity Measurements from Two Arctic Sites   We report the latest results of 225 GHz atmospheric opacity measurements from
two arctic sites; one on high coastal terrain near the Eureka weather station,
on Ellesmere Island, Canada, and the other at the Summit Station near the peak
of the Greenland icecap. This is a campaign to search for a site to deploy a
new telescope for submillimeter Very Long Baseline Interferometry and THz
astronomy in the northern hemisphere. Since 2011, we have obtained 3 months of
winter data near Eureka, and about one year of data at the Summit Station. The
results indicate that these sites offer a highly transparent atmosphere for
observations in submillimeter wavelengths. The Summit Station is particularly
excellent, and its zenith opacity at 225 GHz is statistically similar to the
Atacama Large Milllimeter/submillimeter Array in Chile. In winter, the opacity
at the Summit Station is even comparable to that observed at the South Pole.

1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th