Sun, Space Weather, and Solar-Stellar Connection

Solar EUV, UV & X-ray Irradiance Variability and Their Impacts on Earth’s Climate and Space Weather

Not scheduled

3m

Poster

Speaker

Prof. Kariyappa Rangaiah (Indian Institute of Astrophysics)

Description

Solar EUV, UV & X-ray Irradiance Variability and Their Impacts on
Earth’s Climate and Space Weather
R. Kariyappa (1, 3), H.N. Adithya (2), S. Masuda (3), K. Kusano (3),
S. Imada (4), J. Zender (5), L. Dame (6), E. Deluca (7), M. Weber (7) & T. Matsumoto (3)
(1) Indian Institute of Astrophysics, Bangalore 560034, India
(2) Manipal Centre for Natural Sciences, Manipal University, Manipal-576104, India
(3) Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Nagoya,
Japan
(4) Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
(5) European Space Research and Technology Center (ESTEC), Noordwijk, The Netherlands
(6) LATMOS (Laboratoire Atmosph‘eres, Milieux, Observations Spatiales), France
(7) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
It is important to study the variabilities of solar EUV, UV and X-ray irradiance in heliophysics,
in Earths climate, and space weather applications. Since the radiative output of the Sun is
one of the main driving forces of the terrestrial atmosphere and climate system, the study
of solar energy has become of great interest and importance. Although the solar energy flux
integrated over the entire spectrum is considered to be one of the major natural forces of the
Earths climate system, studying the extreme ultraviolet (EUV), ultraviolet (UV) and X-ray
irradiance variability is particularly important in solar and terrestrial physics. The solar EUV,
UV and X-ray fluxes play in particular a major role in the heating of the Earths atmosphere
and Solar-Terrestrial relationships. Thus it is an important issue to understand their variability
and its applications in Earths climate and space weather.
In this paper we discuss the variability of the total intensity, temperature and magnetic field of
different coronal features such as active regions (ARs), coronal holes (CHs), X-ray bright points
(XBPs) and background regions (BGs) for Solar Cycle 24. The contribution of all these features
to total energy flux over the full disk will be determined, including the total temperature and
magnetic field. The magnetic field is the main source of all the surface features of the Sun. The
role of magnetic field on the variability of intensity and temperature of the coronal features and
the impacts of EUV/UV/X-ray irradiance variability on Earth’s Climate & Space Weather is
discussed in great detail in this paper.