Control of diurnal and seasonal variation of particle precipitation by regular changes of the interplanetary magnetic field |
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| Affiliation: | 2. Centre for Global Health Inequalities Research, Norwegian University of Science and Technology, Trondheim, Norway;1. College of Pharmacology, Harbin Medical University, Harbin 150001, China;2. Heilongjiang Provincial Hospital, Harbin Institute of Technology, Harbin 150030, China;3. First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin 150040, China;4. First Affiliated Hospital, Harbin Medical University, Harbin 150001, China;5. Second Affiliated Hospital, Harbin Medical University, Harbin 150001, China;6. Fourth Affiliated Hospital, Harbin Medical University, Harbin 150001, China;7. College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China;8. Monash Medical Centre, Monash University, Melbourne, VIC 3800, Australia |
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| Abstract: | Systematic changes of the position of the dipole axis of the Earth's magnetic field with respect to the solar axis induce distinct daily and seasonal variations of the vertical Bz-component in the solarmagnetospheric coordinate system (BZSM). Depending on the direction of the interplanetary magnetic field (IMF), negative BZSM- values are produced in spring by T polarity and in autumn by A polarity, whereas in the diurnal variation lowest BZSM-values have been calculated to occur near 23 UT for T, and near 11 UT for A polarity, respectively. In different ionospheric and geomagnetic parameters measured at high and midlatitudes increased precipitation of high energetic particles into the lower thermosphere and upper mesosphere has been detected during periods with negative BZSM-components. The seasonal variation of the parameters investigated, with maximum values near the equinoxes, as well as a part of their diurnal variations, can thus be explained by particle precipitation being markedly controlled by the IMF sector structure. |
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