On the other hand, a sophisticated ring latest through the magnetic storms get force the brand new subsolar magnetopause outward (age

Using seemingly small (20 minute) time times involving the vibrant tension procedures, i implicitly assume that the changes in the magnetopause condition primarily come from the alterations on the solar breeze stress and you will differences of your dayside career-lined up Area step 1 currents. Whilst the magnetotail latest have a somewhat big response big date, but in general it only intensifies the effect of your own Part step 1 current. g., specific estimations were made in the Samso ); however, (1) the latest noncoupled MHD design and that abilities was indeed exhibited significantly more than do perhaps not replicate the new band newest and (2) the period of your own ring most recent intensification often is way more than the step 3–cuatro hr included in such simulations. We show results of your paired activities lower than which is qualitatively just as the outcome of the latest noncoupled design, and this does not changes our very own results.

Eventually, we should examine numerous runs to verify which our results are design-independent. Table step one gathers the advantage legislation indicator Letter into the (1) determined off half dozen items from three in the world MHD activities. The first is this new noncoupled SWMF model whoever performance was indeed demonstrated above. Along with the basic operates (Version step 1), i simulated three almost every other designs of your an identical noncoupled model, two that have increased ionospheric conductivity plus one which have a dipole tilt. This new top-included Pedersen conductivity is assumed to-be equivalent to 5 S in every the brand new models, except brands dos and step three which the latest incorporated conductivity are 10 and you can one hundred S correspondingly. In the variation 4, we artificial new magnetosphere with a great dipole tip 29° . Changes in N anywhere between Models 1 and you may dos and Designs step 1 and 4 is actually small, and you will between Versions step one and you may step 3 are average, however, only for the latest southward IMF. Remember that brand new ionospheric conductivity 100 S is quite highest and you may would be barely observed in reality. I inform you they only to illustrate the latest part off conductivity just like the the two times rise in conductivity when you look at the Version dos alter Letter only for new velocity boost which have southward IMF.

A rise in the fresh new magnetotail latest also upsurge in the fresh Area 1 currents weakens brand https://datingranking.net/pl/lds-singles-recenzja new magnetospheric magnetic field and you will actions brand new dayside magnetopause earthward

Adaptation 5 signifies works of your own SWMF design along with complete inner-magnetosphere ionosphere, and you can Version 6 ‘s the LFM-Merge design. Per version, we generate five runs for the northward/southward IMF and for the thickness and you will velocity increases just like the told me over (twenty four operates altogether). Keep in mind you to definitely N=6 about best theoretic situation if the magnetopause updates suits the stress equilibrium amongst the solar breeze dynamic pressure additionally the World’s dipole field and you may Letter=six.6 regarding the empirical Shue ainsi que al. ( 1998 ) model. In reality, all the obtained Letter are anywhere between these viewpoints otherwise slightly shorter. Five off half dozen models anticipate N huge otherwise equivalent to 7 on works into the density increase getting southward IMF. Even in the event Adaptation 5 predicts Letter smaller compared to seven, Letter are systematically large in cases like this for every model.

At the same time, Tsyganenko and you can Sibeck ( 1994 ) indexed your mix-tail most recent plus in a faster degree the band newest besides the spot step 1 currents dictate new magnetized occupation into the magnetospheric area of the magnetopause

In addition to the comparison of different models, we investigate the influence of grid resolution on our results. We have calculated two runs for the same southward IMF with density and velocity changes using the noncoupled SWMF model with the 1/16 R_E grid spacing around the subsolar magnetopause. We obtain different power laws, N=6.712 and 6.132, in the density and velocity runs, respectively (instead of 7.80 and 6.69 for the same model with a low resolution). Moreover, the normalized (to the solar wind electric field) reconnection rates in the low-resolution runs are smaller than those in the high-resolution runs (but are about the same in the density and velocity runs for the same resolution). We also find some differences in the CPCP and the magnetic field magnitude at geosynchronous orbit. We note that the grid resolution influences the magnitude of maximal electric current density at the magnetopause and possibly may change the total magnetopause current, but this problem requires more careful studies and it stays outside of the scope of the paper.