Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Short story of stratospheric and ground-based observations of solar
  photosphere with high angular resolution in the 70s of the XX century at the
  Pulkovo Observatory   In the 70s of the last century, the stratospheric solar observatory "Saturn"
with a 100cm telescope was launched at Pulkovo Observatory. The photographs and
spectra obtained on it for more than 45 years remained record-breaking in
angular resolution. Then, for ground-based observations of Sun fine structure
in Pamir at an altitude of 4.5 km, a 50 cm open-type Pulkovo mobile telescope
was installed. Photographs and spectra obtained with the Saturn telescope for
the visible range were an important step in the development of high spatial
resolution technologies in heliophysics. However, to date, the details of these
studies remain unknown to the global scientific community. In this paper, an
attempt is made to partially fill this gap.

21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat