Title: Heavy ion SEP observations and their time dependence in solar events Speaker: Peter Zelina Abstract: Solar energetic particles (SEPs) are accelerated in solar flares and shocks driven by coronal mass ejections as a result of solar activity. Transient phenomena, when these particles are detected in-situ, are called SEP events. Radio communication, GPS signal or high-altitude travel can be affected as a result. Energetic protons and electrons are the most abundant species, but SEPs also contain heavy ions such as Fe, O, C and N. These ions are partially ionised in the space environment resulting in a range of obtainable mass/charge values. The temporal evolution of ratios such as Fe/O is observed to vary as much as 2 orders of magnitude but other ratios show less variation. Here we consider a number of ionic pairs and study the properties of their temporal evolution characterised by the time constant B. The time profiles of elemental ratios increase or decrease in accordance to the ratio of mass/charge values of the two ions. In addition, heavy ion SEPs can be observed in locations which are not magnetically well-connected to the source region despite their relative abundance. In-situ particle detectors onboard spacecraft ACE, STEREO A and B observed heavy ion SEPs also when they were separated in longitude. The expected observed longitudinal distribution of Fe/O, where the observer with better magnetic connection detected a higher Fe/O value, occurred in some, but not all, events. We discuss these results and consider the implications for interplanetary transport of SEPs.