Conveners
Solar Irradiance and Particle Variability: (1 invited talk + 3 contributed talks)
- Margit Haberreiter (PMOD/WRC, Davos, Switzerland)
- Hilde Nesse
Solar Irradiance and Particle Variability: (2 contributed talks)
- Hilde Nesse
Solar Irradiance and Particle Variability: (3 contributed talks)
- Hilde Nesse
- Margit Haberreiter (PMOD/WRC, Davos, Switzerland)
Solar Irradiance and Particle Variability: (1 invited talk + 3 contributed talks)
- Margit Haberreiter (PMOD/WRC, Davos, Switzerland)
- Hilde Nesse
The energetic electrons in the Earth’s radiation belts and ring current can precipitate to the atmosphere. Such precipitation of energetic particles from space can generate nitric oxide in the atmosphere, and nitric oxide can destroy ozone very efficiently. Geomagnetic activity that controls the precipitation of magnetospheric particles is now recommended as part of the solar forcing of the...
The Total Radiation Belt Electron Content (TRBEC) is a measure of the global number of electrons that occupy the radiation belts. It can be calculated based on electron flux measurements and provides a simple, global assessment of the radiation belts. When expressed in adiabatic coordinates, the TRBEC increases abruptly during storms and then decreases with a repeatable and consistent...
Energetic particle precipitation (EPP) increases ionization in the D-region ionosphere, elevating cosmic radio signal absorption. This impact is monitored by a Canadian network of wide-beam passive radio receivers, or riometers. Ionospheric absorption expected during a specific EPP event, as recorded by a Polar Orbiting Environmental Satellite (POES), is modelled and compared with measurements...
AISstorm (Atmospheric Ionization during Substorms Model) derives the global atmospheric ionization due to particle precipitation based on in-situ particle measurements. The model covers auroral precipitation as well as solar particle events on an altitude range of about 250km down to 16km for protons and down to 70km for electrons.
The ionization of alpha particles is also included, but in a...
Incoming solar irradiance establishes Earth’s surface and atmospheric temperature, driving coupled radiative, dynamical, and chemical processes that produce myriad land, ocean, and atmospheric interactions. The Sun’s irradiance is spectrally dependent, as is its variability, on time scales from days to centuries and longer. A fundamental quantity for Earth’s energy and climate studies, solar...
Solar variability varies on many timescales from minutes to decades and beyond. To determine the effect of solar irradiance on the Earth's system the knowledge of the incoming solar radiation needs to be known with high precision. We report on latest advances in measuring TSI with the CLARA radiometer onboard NorSat-1 and compare it to the latest TSI measurements. Besides TSI, CLARA also...
The eigen vectors of magnetic oscillations obtained with Principal Component Analysis from full disk synoptic maps of solar background magnetic field (SBMF) from the Wilcox Solar Observatory are shown to come in pairs assigned to magnetic waves produced by dipole, quadruple, sextuple and octuple magnetic sources. The first pair is linked to dipole magnetic waves with their summary curve...
This study compares the electron ionization peak altitudes observed by the Special Sensor Ultraviolet Spectrographic Imager (SSUSI) and the Atmospheric Ionization during Substorm Model (AISstorm) over 70.2°N during 2010. SSUSI data predominantly shows ionization peaks at 100 km altitude, while AISstorm data indicates peaks primarily at 110 km. The discrepancy may partly be impacted by the...
Precipitating plasma sheet, ring current, and radiation belt electrons will affect the ionization level and composition of the neutral atmosphere. Knowledge gaps remain regarding the frequency, intensity, and energy spectrum of the Medium Energy Electron (MEE) precipitation ($\gtrsim$30 keV). In particular, the understanding and predictive capabilities of the high-energy tail ($\gtrsim$300...
Cross-disciplinary research efforts have led to the emergence of numerical tools capable of taking advantage of the present-day heterogeneous supercomputers, enabling computing at Exa-scale. The first results of running these tools in full production are emerging. In contrast to the CPU paradigm, these runs can be completed within days - a week in contrast to several months. Hence, when...
Solar irradiance is one of the forcing agents of the Earth's climate system. Space-based monitoring
of solar irradiance since the late 1970s has revealed variations across all observed time scales,
providing crucial insights into the physical mechanisms behind solar irradiance changes. However,
the relatively short duration of these records limits our ability to fully assess the Sun’s...
The Sun experienced a period of unprecedented activity during solar cycle 19 in 1950s and 1960s, now called the Modern Maximum (MM). The decay of the MM has changed the Sun, the heliosphere and the planetary environments in many ways. However, this decay may not have proceeded synchronously in all solar parameters. One of the related key issues is if the relation between the two long...
The Earth's magnetic field is a complex entity with a heterogeneous structure, exhibiting varying strengths across different coordinates. Of particular interest is the South Atlantic Anomaly (SAA), a region characterized by a strong magnetic field and intense precipitation processes. Accurate modeling of this area demands a comprehensive approach, involving the calculation of magnetic fields...
