Having fun with seemingly small (20 min) day intervals between your dynamic pressure measures, i implicitly think that the alterations regarding the magnetopause reputation primarily result from the changes regarding the solar piece of cake stress and you will variations of the dayside field-lined up Part step 1 currents. Whilst the magnetotail newest could have a somewhat big response big date, but in general it merely intensifies the end result of your own Area step 1 latest. g., some estimations were made into the Samso ); not, (1) the noncoupled MHD design and therefore results was in fact presented more than really does maybe not duplicate the fresh band current and you can (2) the time of the band newest intensification is often a whole lot more compared to 3–cuatro time used in such simulations. We show results of your coupled activities less than which is qualitatively similar to the outcome of brand new noncoupled design, so this doesn’t transform our very own results.
Eventually, we need to compare numerous works to verify which our email address details are design-independent. Desk step 1 gathers the benefit legislation indicator Letter into the (1) computed out-of six products of three around the globe MHD habits. The first is the fresh new noncoupled SWMF design whose overall performance have been presented above. And the very first works (Adaptation step one), i simulated around three other sizes of a comparable noncoupled design, several which have a high ionospheric conductivity and another with good dipole tilt. The brand new level-included Pedersen conductivity is thought are equivalent to 5 S in every the newest systems, except systems 2 and you will 3 for which the new integrated conductivity is actually ten and you may 100 S correspondingly. When you look at the type 4, i artificial the newest magnetosphere having good dipole tip 31° . Alterations in Letter between Versions step 1 and you may 2 and you will Sizes step 1 and you will cuatro are short, and you will anywhere between Models step one and you can step three is actually moderate, but just for brand new southward IMF. Note that the newest ionospheric conductivity 100 S may be very high and you will might be barely present in truth. We tell you it only to teach this new part out-of conductivity because both times increase in conductivity when you look at the Version 2 change N simply for the fresh speed raise that have southward IMF.
A rise in the fresh magnetotail latest also increase in the brand new Part 1 currents weakens the https://datingranking.net/pl/hiki-recenzja/ brand new magnetospheric magnetic industry and moves the dayside magnetopause earthward
Variation 5 represents runs of SWMF model combined with complete interior-magnetosphere ionosphere, and you will Version 6 ‘s the LFM-Blend model. Each type, i build five operates into northward/southward IMF and for the occurrence and you may speed expands because said over (24 operates in total). Keep in mind that Letter=six from the ideal theoretical situation if your magnetopause standing meets the stress harmony amongst the solar power snap vibrant tension and also the Earth’s dipole career and you will N=six.6 regarding the empirical Shue mais aussi al. ( 1998 ) model. Indeed, the gotten N are anywhere between these two thinking or a bit faster. Four regarding six types assume N huge or comparable to seven about works on the density raise to own southward IMF. Even if Type 5 predicts Letter smaller compared to seven, Letter is methodically higher in such a case for every design.
At the same time, Tsyganenko and you will Sibeck ( 1994 ) listed your get across-end current plus in a less training the newest ring current as well as the region 1 currents influence the brand new magnetized field toward magnetospheric section 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 RE 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.