3 Conversation and you will Conclusions
Very empirical magnetopause activities imagine a general relatives involving the solar power piece of cake active stress and jest korean cupid za darmo magnetopause standoff point step one, where Letter remains constant for everyone solar piece of cake criteria. Throughout the phony operates, i change one solar wind plasma parameter, possibly this new thickness otherwise acceleration, having the exact same step-including increases on vibrant stress in both cases. We improve simulations for northward and you will southward IMF and you can assess the power rules directory Letter. We compare several products of SWMF and LFM-Merge designs acquire comparable fashion for all designs just like the explained less than.
Our results also show that the increase in the ionospheric conductivity or the use of a model with the additional inner magnetosphere-ionosphere block result in decrease in N. Therefore, we cannot derive a single N from the MHD simulations because the dispersion in N between the models is large; however, all models predict the same changes between different runs related to the density and velocity increases, and Bz sign.
The simulations we present suggest that dayside magnetopause reconnection influences the magnetic field magnitude at geosynchronous orbit near subsolar point. We obtain different geosynchronous magnetic fields in northward and southward IMF runs with the same dynamic pressure. Moreover, the magnetic field magnitude is also different when comparing the runs in which both the dynamic pressure and Bz are kept the same and only the ratio between the solar wind ? and V is different. Increasing velocity instead of density for a southward IMF, we increase the magnetopause reconnection rate and this results in an observable difference in the magnetic field at geosynchronous orbit with a smaller |B| corresponding to a larger VSW. Similar variations at geosynchronous orbit are observed in northward/southward turning events with a constant solar wind dynamic pressure (Samso ).
Our results partly agree with the results in Nemecek et al. ( 2016 ). We find that an increase in the ionospheric conductivity causes stronger variations of the magnetopause standoff distance, but, contrary to Nemecek et al. ( 2016 ), an increase in the solar wind velocity may also enhance variations of the standoff distance. However, we cannot compare our results with Nemecek et al. ( 2016 ) directly. Nemecek et al. ( 2016 ) normalized observed RSandwich by the Shue et al. ( 1997 ) model and obtained that the model underestimates RSub for high velocities. First, we note that it would agree with a numerical model for which N>6.6 since N=6.6 in Shue et al. ( 1997 ). Second, variations of the solar wind velocity cannot be treated independently in the observations, they correlate with variations of the magnetic field (Owens & Cargill, 2002 ), and even (on a large time scale) with the ionospheric conductivity because higher velocities are usually observed at solar maximum. Therefore, it is difficult to make a straightforward conclusion from these results.
Within really works, we only use MHD simulations and then make runs toward phony solar wind criteria. But not, we believe one MHD activities reproduce fairly really brand new magnetopause standoff distance having regular solar cinch conditions (Samso ). I greeting this particular performs will help in the development of future empirical magnetopause models. One of the forthcoming objectives that can studies variations of your own dayside magnetopause ‘s the Solar power Cinch Magnetosphere Ionosphere Connect Explorer (SMILE) (Raab ainsi que al., 2016 ). Using Laugh, i will be in a position to receive a continuing go out series of the magnetopause standoff distance to own varying solar power cinch conditions and just have examine prospective empirical habits.
Acknowledgments
So it performs was achieved utilising the SWMF/BATSRUS devices establish at the School of Michigan Center to own Place Ecosystem Acting as well as the LFM-Mix design available from the NASA Society Matched Modeling Cardiovascular system ( Specifically, i put outcome of the fresh new operates Andrey_Samsonov_072419_(1-4). An effective. A. S. and you can Grams. B. Roentgen. admit support about British Area Agency lower than Offer ST/R002258/1. Y. V. B. try backed by this new STFC RAL Area IHR offer.