We create a series of MHD runs to test so it expectation

We create a series of MHD runs to test so it expectation

step 3 Conversation and you may Findings

Extremely empirical magnetopause designs guess a broad family between your solar power breeze dynamic tension additionally the magnetopause standoff range 1, in which Letter remains constant for everybody solar power snap standards. In the phony runs, we transform just one solar snap plasma factor, sometimes the thickness or velocity, acquiring the exact same step-including expands throughout the dynamic stress in both cases. I result in the simulations for northward and you may southward IMF and you can determine the benefit laws list N. I evaluate numerous types of SWMF and you can LFM-Mix designs and obtain similar style for all models since informed me below.

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 RSub 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.

In our really works, we just use MHD simulations while making operates on phony solar wind requirements. not, we think that MHD designs duplicate reasonably well the newest magnetopause standoff point for normal solar power piece of cake requirements (Samso ). I enjoy that really works can assist on growth of future empirical magnetopause designs. Among the many certain missions that data differences of the dayside magnetopause ‘s the Solar power Breeze Magnetosphere Ionosphere Hook Explorer (SMILE) (Raab mais aussi al., 2016 ). Using Laugh, we are able to see a continuing go out number of the fresh new magnetopause standoff range to have variable solar snap standards and get validate possible empirical patterns.

Acknowledgments

That it work is actually accomplished utilizing the SWMF/BATSRUS devices profile tastebuds establish from the University from Michigan Cardio for Place Environment Acting as well as the LFM-Blend design readily available from the NASA Community Matched up Modeling Cardio ( Specifically, we utilized consequence of the fresh operates Andrey_Samsonov_072419_(1-4). A good. An effective. S. and you will Grams. B. Roentgen. admit assistance regarding the British Room Department less than Give ST/R002258/step 1. Y. V. B. are supported by the brand new STFC RAL Area IHR give.

Deja un comentario

Tu dirección de correo electrónico no será publicada. Los campos obligatorios están marcados con *