Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prediction of the strength and timing of sunspot cycle 25 reveal
  decadal-scale space environmental conditions   The Sun's activity cycle governs the radiation, particle and magnetic flux in
the heliosphere creating hazardous space weather. Decadal-scale variations
define space climate and force the Earth's atmosphere. However, predicting the
solar cycle is challenging. Current understanding indicates a short window for
prediction best achieved at previous cycle minima. Utilizing magnetic field
evolution models for the Sun's surface and interior we perform the first
century-scale, data-driven simulations of solar activity and present a scheme
for extending the prediction window to a decade. Our ensemble forecast
indicates cycle 25 would be similar or slightly stronger than the current cycle
and peak around 2024. Sunspot cycle 25 may thus reverse the substantial
weakening trend in solar activity which has led to speculation of an imminent
Maunder-like grand minimum and cooling global climate. Our simulations
demonstrate fluctuation in the tilt angle distribution of sunspots is the
dominant mechanism responsible for solar cycle variability.

14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph