masterThesis
Estudo sobre a influência dos ciclos solares nas condições atmosféricas na região de jurisdição da FIR Curitiba (FIR - SBCW)
Fecha
2022-02-21Registro en:
LIMA, Arthur Bandeira Luz de. Estudo sobre a influência dos ciclos solares nas condições atmosféricas na região de jurisdição da FIR Curitiba (FIR - SBCW). 2022. 180f. Dissertação (Mestrado em Engenharia e Ciências Aeroespaciais) - Escola de Ciência e Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2022.
Autor
Lima, Arthur Bandeira Luz de
Resumen
Although there were SSN records dating to years before Christ, the systematic counting
of SSN were recorded after the 17th Century, only. There is no doubt that the solar
cycle nature is due to morphological variation in the Sun Magnetic Field Structure. An
ensemble of physics processes inside the Sun makes that magnetic field lines undergo though
systematic variation along 11 years. This solar cycle interfere, in many ways, the modern
life. The increase in the Solar Flares and Coronal Mass Ejection number may compromise
both the satellite/spacecraft lifespan and astronauts in the space and flight crew who
travel through the poles health. The increase generated in Solar emission in Extreme
Ultraviolet (EUV) and X-Ray cause thermodynamic variation in the upper atmosphere,
which, in their turn, might shorten the orbital lifetime of low orbit satellite. Works e.g
Svensmark and Friis-Christensen (1997) proved that such solar variations also influence the
thermodynamics lower atmosphere conditions. According to these authors, greater Galactic
Cosmic Rays (CGR) penetration during solar minimums causes an increase in the aerosols
synthesis, favoring an increase in the cloud cover. Beside that, works e.g Eddy (1976)
showed that the period known Maunder Minimum, the Earth experienced an anomalous
cooling. That said, this work aimed to investigate correlations between solar activities
and atmospheric conditions observed at Campo Grande, Curitiba, Porto Alegre and Rio
de Janeiro cities, during the solar cycles 19, 20, 21, 22 and 23. These cities are distributed
inside the Flight Information Region Curitiba (SBCW-FIR), where a large amount of
aircraft crosses every day. Beside that, this region is often affected by meteorological
conditions that may interfere in the flight safety, such as icing, thunderstorms and fogs. In
order to comply this objective, initially, Wavelet techniques were used to investigate the
correlation between CGR flux observed at Hermanus and Potchefstroom stations and the
solar activity indexes SSN and F10.7 Solar Emission. These stations are located in South
Africa, and therefore, inside the latitudinal range where the SBCW-FIR is located in. In
addition, meteorological data collected from those cited cities where reconstructed for the
scales of 64, 128 and 256 months. Finally, the coherence level between these time series
and SSN and F10.7 time series was evaluated. Agreeing with other work (e.g Belov (2000)),
it was observed coherence level close to 1 between CGR and SSN/F10.7 time series, for the periodicity close to 11 years, at a phase angle close to 180o
. With the exception of 128
scale period for the mean surface temperature in Porto Alegre, all time series regarding
to atmospheric conditions showed periodicity of 64, 128 and 256 months. Regarding to
the coherence level, it was observed high levels for the seasonality close to 64, 128, 256
and 512 months. In other words, there are correlations between the solar cycles and the
atmospheric conditions inside this region.