Sökning: "solar proton event"

Hittade 5 uppsatser innehållade orden solar proton event.

  1. 1. The Changing Character of Mars’ Bow Shock

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Sara Östman; [2021]
    Nyckelord :Bow shock; Space plasma physics; Mars;

    Sammanfattning : The aim of the project is to investigate the characteristics and causes of two different types of bow shocks at Mars. We define Type 1 as an undefined, drawn out ramp, and Type 2 as a shorter duration ramp that has clearer characteristics and behaves more like a step increase in the magnetic field. LÄS MER

  3. 2. Modeling the complex ejecta on 2017 September 6-9 with WSA-ENLIL+Cone and EUHFORIA

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi; Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen

    Författare :Anita Linnéa Elisabeth Werner; [2018]
    Nyckelord :CME; space weather; forecast; prediction; WSA-ENLIL Cone; EUHFORIA; preconditioning; type II radio burst; kmTII; dcld; September 2017; geoeffective;

    Sammanfattning : Three CMEs which erupted on 2017 Sep 4 and 6 underwent mutual interaction before reaching Earth on Sep 6-9, where it gave rise to a complex and unexpectedly geoeffective structure as detected by WIND at L1. The spacecraft first observed an interplanetary (IP) shock on Sep 6 followed by a turbulent sheath. LÄS MER

  4. 3. Multiradionuclide evidence for an extreme solar proton event around 2610 BP

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Martin Paschal Ohare; [2017]
    Nyckelord :cosmic-rays; cosmogenic radionuclides; NGRIP; GRIP; solar proton event; SPE; Earth and Environmental Sciences;

    Sammanfattning : Recently it has been confirmed that extreme solar proton events (SPE) can lead to significantly increased production of cosmogenic radionuclides (Mekhaldi et al. 2015). The evidence of these events can be recorded in tree rings (14C) and ice cores (10Be, 36Cl). LÄS MER

  5. 4. A study of SPEs ​and the consequences of radiation exposure

    Master-uppsats, KTH/Farkost och flyg

    Författare :Signe Björnholdt Böll; [2017]
    Nyckelord :;

    Sammanfattning : With thorough literature studies as well as simulations, a way to minimize the exposure to radiationthat astronauts are at risk of encountering during a solar proton event is sought. The understanding ofwhere these particles come from, as well as the random nature of solar particle events is of importancein order to predict their occurrence. LÄS MER

  7. 5. The cosmic-ray events around AD 775 and AD 993 : assessing their causes and possible effects on climate

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Florian Mekhaldi; [2014]
    Nyckelord :cosmic-rays; cosmogenic radionuclides; GICC05; NGRIP; solar proton event; storminess; Earth and Environmental Sciences;

    Sammanfattning : Miyake et al. (2012, 2013) discovered rapid increases of 14C content in tree rings dated to AD 774-5 and AD 992-3 which were attributed to unprecedented cosmic-ray events. These extreme particle events have no counterparts in the instrumental and historical record and consequently praised great interest. LÄS MER