- Notice.Runs: 1 = The fresh new noncoupled SWMF (v20140611); dos = an equivalent noncoupled SWMF having ionospheric conductivity away from 10 S alternatively of five S; step 3 = the same model that have a highly higher ionospheric conductivity 100 S; 4 = a similar model which have a good dipole tip 31° from inside the xz jet; 5 = the newest SWMF SIMI (interior magnetosphere-ionosphere) v20180525; six = brand new LFM-Combine. What “Density” and “Velocity” imply that just density and you will velocity were increased, “Northward” and you may “Southward” suggest the fresh IMF orientation.
Both thickness and speed jumps are nonstationary structures due to the fact one another of them don’t meet with the Rankine-Hugoniot affairs
We suggest that the difference regarding magnetospheric reaction to the brand new thickness and you may acceleration develops try informed me of the magnetopause magnetized reconnection. In the event the occurrence increases additionally the velocity are ongoing, for even a great southward IMF, the latest solar power snap electric profession remains the exact same together with magnetopause reconnection rate manage will vary insignificantly. This new intensification of current program weakens the brand new magnetospheric magnetic profession and you will moves the brand new dayside magnetopause earthward, in the same way due to the fact happens in your situation away from southward IMF turning (Sibeck, 1994 ).
Therefore, it raises the magnetospheric-ionospheric currents, in particular the location step one latest
We show the brand new y component of the fresh magnetosheath electric occupation for the the fresh inflow part (at sunward edge of your magnetopause newest covering), absolute reconnection price, this new ratio of your own inflow acceleration on the magnetosheath Alfven rate, and the reconnection rate stabilized on the complete solar power wind digital job in the Shape S2 from the support advice. The new reconnection price has been calculated at boundaries of your magnetopause current level because the told me within the Cassak and you may Shay ( 2007 ), Borovsky ainsi que al. ( 2008 ), and you will Borovsky and you will Birn ( 2014 ). (Contour S1 and also the involved need on the support information offer additional information on the method.) We find your difference between the newest magnetosheath electric career and you may reconnection price among them works which have thickness and you will acceleration expands instabang reddit is comparable to the real difference regarding solar piece of cake electric profession, and for the situation on the improved velocity the absolute reconnection speed (together with Ey electronic community) throughout the inflow area increases over the years and at the end from simulation focus on gets dos.five times larger than the absolute reconnection speed (or Ey) into circumstances to your improved thickness. However, brand new reconnection costs stabilized towards the solar power wind digital occupation are nearly a comparable in operates and you may somewhat disappear when you look at the operates from around 0.55 to help you 0.cuatro. This type of opinions are close to people obtained during the simulation A good in Borovsky et al. ( 2008 ).
Highest reconnection speed intensifies the spot step 1 most recent and you will increases the cross polar cap potential (CPCP). Profile S3 reveals temporary differences of CPCP inside the four works. For the northward and southward IMF, the latest CPCP expands reduced in the case of speed boost, however, again the real difference gets good-sized with the southward IMF. The CPCP appears to are still mostly below a great saturation peak (Slope mais aussi al., 1976 ; Siscoe et al., 2002 ), though it might possibly be close to the saturation getting a largest CPCP found in this really works (southward IMF, high-velocity). In any event, we do not take notice of the aftereffect of saturation towards the magnetopause area, instance, while deciding the fresh dependencies when you look at the Contour step three.
The develops throughout the CPCP in the Shape S3 was followed by overshoots and you will undershoots, particularly in Operates dos and you will cuatro towards acceleration raise. Why of them transients could well be told me by following. In both cases, the total pressure grows from the discontinuities but the increase in the fresh new velocity instantaneously causes a rise in this new occurrence while the dwelling propagates about solar power wind regarding inflow border to the ribbon wonder. That it ic stress close to the magnetopause. You will find checked a potential rise in new occurrence close to the subsolar bend shock in the Works 2 and you can cuatro and found one this new solar power wind occurrence very develops during the jumps in the speed, however, here at numerous basic jumps. Whether your solar power piece of cake acceleration is reduced, the fresh new propagation time on inflow edge with the bow treat is a lot of time and so the density provides enough time to pile up. Yet not, the newest thickness improvement falls below step 1% on the acceleration higher than five hundred kilometer/s. Since this effect was negligible usually, we believe this cannot dictate the newest hills in Figure step 3. As well as, brand new grows on solar breeze speed contributes to almost every other discontinuities on magnetosheath and you can magnetosphere since the people submit and you will reflected compressional surf mentioned above. Anyway, i just use quasi-steady state beliefs adopting the transients within our data.
