Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Long Term Variability in Solar Analogs   Earth is the only planet known to harbor life, therefore we may speculate on
how the nature of the Sun-Earth interaction is relevant to life on Earth, and
how the behavior of other stars may influence the development of life on their
planetary systems. We study the long-term variability of a sample of five solar
analog stars using composite chromospheric activity records up to 50 years in
length and synoptic visible-band photometry about 20 years long. This sample
covers a large range of stellar ages which we use to represent the evolution in
activity for solar mass stars. We find that young, fast rotators have an
amplitude of variability many times that of the solar cycle, while old, slow
rotators have very little variability. We discuss the possible impacts of this
variability on young Earth and exoplanet climates.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th