BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Remote sensing of atmospheric Aerosol Optical Depth DTSTART;VALUE=DATE-TIME:20210730T093000Z DTEND;VALUE=DATE-TIME:20210730T094500Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7045@events.saip.org.za DESCRIPTION:Speakers: Zimbini Faniso (CSIR)\nThe paper presents the data a nalysis of Aerosol Optical Depth (AOD) measured from a CIMEL Sun-photomete r at CSIR-Defence and Security in Pretoria\, South Africa. This Aeronet in strument has been recording data since 2011 till 2018 for use in the calib ration and validation process of space sensors such as earth observation s atellites in space. These sensors encounter challenges while capturing inf ormation about the earth surface since the presence of aerosols in the atm osphere inhibit the target image and degrade information about the area. T he purpose of ground truth instruments such as the CIMEL Sunphotometer is to generate aerosol measurements specifically the AOD\, and requires analy sis of the data to ensure stability and quality before any calibration or validation of the Satellite sensor. The study will provide an overview of the AOD behaviour during warm and dry seasons of the 2017 data.\n\nhttps:/ /events.saip.org.za/event/206/contributions/7045/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7045/ END:VEVENT BEGIN:VEVENT SUMMARY:Simulations of coronal loops undergoing transverse decay-less osci llations DTSTART;VALUE=DATE-TIME:20210730T104500Z DTEND;VALUE=DATE-TIME:20210730T110000Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7044@events.saip.org.za DESCRIPTION:Speakers: Konstantinos Karampelas (Northumbria University)\nOb servations of solar coronal loops with the Atmospheric Imaging Assembly (A IA) instrument of SDO have revealed the existence of a low amplitude decay -less regime of transverse oscillations. These appear to be like the well understood large amplitude and rapidly decaying fast kink-mode oscillation s observed in loops\, but their means of excitation and exact nature are s till debated. Addressing these two questions is essential for using the fo rmer as diagnostic tools in coronal seismology\, as well as determining th eir potential role in wave heating of the solar corona. In this talk\, res ults from a number of 3D numerical magnetohydrodynamic studies will be pre sented\, in which we have studied loops undergoing decay-less oscillations . The different proposed interpretations and excitation mechanisms of thes e waves will be presented\, alongside our results on the spatial evolution of these oscillating loops. Wave energy dissipation in the case of decay- less oscillations will also be discussed\, alongside some of our recent fi ndings supporting the idea that the dissipated energy can potentially over come of the radiative losses for the Quiet Sun.\n\nhttps://events.saip.org .za/event/206/contributions/7044/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7044/ END:VEVENT BEGIN:VEVENT SUMMARY:Energy deposition through Landau damping DTSTART;VALUE=DATE-TIME:20210730T103000Z DTEND;VALUE=DATE-TIME:20210730T104500Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7042@events.saip.org.za DESCRIPTION:Speakers: Gert Botha (Northumbria University)\nCharged particl es and plasma waves occur throughout the solar system. These particles can move slowly relative to the plasma or be accelerated to relativistic spee ds by reconnection events such as solar flares. The types of waves depend on whether one considers the plasma in the solar chromosphere\, solar coro na\, solar wind or the planetary magnetospheres. In this study we investig ate the amount of energy that becomes available when the charged particles interact with the plasma waves through the mechanism of Landau damping. T he linearised Vlasov equation is solved\, from which we obtain an expressi on for the total amount of energy available for transfer through the Landa u mechanism. The interactions with Alfven\, slow and fast magnetosonic\, a s well as ion-cyclotron waves are obtained. In each case the energy deposi ted into the plasma is calculated\, which is then available to do work in the form of heating or acceleration of the local plasma. The final express ions are presented in terms of Stokes parameters.\n\nhttps://events.saip.o rg.za/event/206/contributions/7042/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7042/ END:VEVENT BEGIN:VEVENT SUMMARY:Obliquely propagating solitons and supersolitons in magnetized thr ee-component plasmas with adiabatic ions and two-temperature electrons DTSTART;VALUE=DATE-TIME:20210730T101500Z DTEND;VALUE=DATE-TIME:20210730T103000Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7039@events.saip.org.za DESCRIPTION:Speakers: Shivani Singh (SANSA)\nLarge amplitude nonlinear sol iton and supersoliton structures are investigated in three-component magne tized plasma models\, consisting of inertial adiabatic ions and two-temper ature electrons. We determine the existence of nonlinear structures which are propagating obliquely relative to the ambient magnetic field using the Sagdeev pseudopotential formalism in which an energy integral is derived\ , under the assumption of quasineutrality. We will test the plasma composi tion and parameter range to establish whether the system supports the exis tence of supersolitons. The electric fields of such structures have a char acteristic wiggled appearance in comparison with regular solitons. We cons ider first Boltzmann distributions for the cool and hot electrons and then study the effect of nonthermal Cairns and kappa distributions for the hot electrons\n\nhttps://events.saip.org.za/event/206/contributions/7039/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7039/ END:VEVENT BEGIN:VEVENT SUMMARY:Aviation dosimetry science in South Africa DTSTART;VALUE=DATE-TIME:20210730T100000Z DTEND;VALUE=DATE-TIME:20210730T101500Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7043@events.saip.org.za DESCRIPTION:Speakers: Godfrey Mosotho (NORTH - WEST UNIVERSITY)\nRadiation exposure during commercial flights remains one of the dominating and inev itable factors relevant to flight personnel and passengers' health and saf ety. At aviation altitudes\, the radiation environment that the flight per sonnel are exposed to\, during their day-to-day occupational activities\, differs significantly from terrestrial radiation received by the general p opulation on the ground. Currently\, there are no dosimetric services in S outh Africa that collects data of the flight personnel's exposure during t heir occupational activities. The North-West University\, in conjunction w ith scientists from the *Christian-Albrechts-Universität zu Kiel*\, have assembled an active (battery powered) dosimeter (known as the RPiRENA) to measure the flight personnel and passengers' exposure during commercial fl ight cruises. Here we introduce this device\, discuss its calibration\, an d show initial results during long-haul flights.\n\nkeyword(s): Radiation dosimetry\, Active dosimeters\, Cosmic-rays\n\nhttps://events.saip.org.za/ event/206/contributions/7043/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7043/ END:VEVENT BEGIN:VEVENT SUMMARY:Solar modulation of Helium isotopes from minimum to maximum activi ty DTSTART;VALUE=DATE-TIME:20210730T094500Z DTEND;VALUE=DATE-TIME:20210730T100000Z DTSTAMP;VALUE=DATE-TIME:20261015T103454Z UID:indico-contribution-417-7035@events.saip.org.za DESCRIPTION:Speakers: Donald Ngobeni (1. Centre for Space Research\, North -West University\, Potchefstroom\, South Africa 2. School of Physical & Ch emical Sciences\, North-West University\, Mmabatho\, South Africa)\nThe so lar modulation of Helium isotopes (Helium-3 and Helium-4) is studied and c ompared to observations at the Earth. This is done from the period of mini mum solar activity from 2006 to 2011\, up to the period of solar maximum a ctivity from 2012 to 2015. Computed spectra are compared to the precise me asurements of Helium-3 and Helium-4 fluxes measured by the PAMELA and AMS- 02 space missions between July 2006 and December 2015\, spanning time fram es that include the solar magnetic field reversal epoch. Insight gained fr om this comprehensive modeling\, with a three-dimensional drift model\, ab out the relative roles of the four main modulation processes over the ment ioned period will be shown and discussed.\n\nhttps://events.saip.org.za/ev ent/206/contributions/7035/ LOCATION:North-West University Potchefstroom Campus URL:https://events.saip.org.za/event/206/contributions/7035/ END:VEVENT END:VCALENDAR