- Mention.Runs: step 1 = Brand new noncoupled SWMF (v20140611); 2 = an identical noncoupled SWMF which have ionospheric conductivity away from ten S as an alternative of 5 S; step 3 = a comparable model having an incredibly high ionospheric conductivity a hundred S; cuatro = the same design with an excellent dipole tilt 29° for the xz airplane; 5 = new SWMF SIMI (inner magnetosphere-ionosphere) v20180525; six = the new LFM-Mix. The words “Density” and you will “Velocity” signify simply thickness and acceleration was in fact enhanced, “Northward” and “Southward” indicate this new IMF direction.
The occurrence and you will acceleration jumps was nonstationary formations because both of them don’t meet up with the Rankine-Hugoniot connections
I suggest that the difference regarding magnetospheric a reaction to new occurrence and you may velocity develops was explained because of the magnetopause magnetic reconnection. In case the thickness develops and also the velocity are constant, for even an effective southward IMF, brand new solar power cinch digital career continues to be the same as well as the magnetopause reconnection rates manage differ insignificantly. The fresh intensification from the current system weakens the magnetospheric magnetic job and motions the fresh dayside magnetopause earthward, in the same way once the takes place in your situation off southward IMF turning (Sibeck, 1994 ).
Consequently, this raises the magnetospheric-ionospheric currents, particularly the spot 1 newest
I tell you this new y component of the newest magnetosheath electronic field in the the fresh inflow area (during the sunward line of your magnetopause newest layer), natural reconnection price, new proportion of the inflow speed towards magnetosheath Alfven price, plus the reconnection speed stabilized with the complete solar cinch electronic field during the Shape S2 on supporting advice. The new reconnection price has been calculated from the boundaries of your magnetopause most recent covering due to the fact told me during the Cassak and you may Shay ( 2007 ), Borovsky mais aussi al. ( 2008 ), and you may Borovsky and you can Birn ( 2014 ). (Profile S1 and also the involved cause from the support suggestions offer additional information on the method.) We find the habbo difference between the fresh new magnetosheath electronic profession and you may reconnection rate among them runs that have density and you can speed develops is related to the difference from the solar cinch electric industry, and also for the circumstances towards the enhanced acceleration the absolute reconnection speed (additionally the Ey electronic occupation) from the inflow part expands eventually as well as the finish of simulator run becomes dos.five times bigger than the absolute reconnection rate (or Ey) towards the instance on the improved density. Yet not, the new reconnection cost stabilized on solar power breeze electric career is actually almost a similar in works and you will slightly disappear within the operates from about 0.55 to 0.4. Such philosophy is near to people received from inside the simulator A during the Borovsky ainsi que al. ( 2008 ).
Higher reconnection price intensifies the location step one current and advances the get across polar cap potential (CPCP). Shape S3 suggests temporal differences of one’s CPCP for the four runs. For both the northward and you may southward IMF, the fresh new CPCP expands shorter in the example of acceleration improve, however, once more the difference gets large toward southward IMF. The fresh CPCP seems to are nevertheless mainly below a beneficial saturation level (Hill ainsi que al., 1976 ; Siscoe et al., 2002 ), though it was near the saturation for a premier CPCP found in it work (southward IMF, high-velocity). In any event, we do not take notice of the aftereffect of saturation towards magnetopause area, such as for instance, while considering the brand new dependencies when you look at the Shape step three.
The brand new expands regarding the CPCP from inside the Profile S3 try followed by overshoots and you may undershoots, particularly in Runs 2 and cuatro toward velocity improve. The reason of those transients might possibly be said by following the. In the two cases, the entire stress increases from the discontinuities nevertheless the increase in the latest velocity immediately contributes to a boost in the thickness if you find yourself the structure propagates regarding the solar breeze regarding inflow border with the bend surprise. So it ic pressure near the magnetopause. I have examined a potential escalation in the latest thickness near the subsolar bow surprise during the Works 2 and you may 4 and found one to new solar breeze occurrence very expands from the jumps within the speed, however, here at numerous basic jumps. If the solar snap velocity was lowest, this new propagation day from the inflow line to your ribbon treat try long therefore the occurrence enjoys enough time to stack up. not, the newest occurrence enhancement drops lower than 1% into the acceleration more than five-hundred km/s. As this perception are negligible more often than not, we think so it does not dictate the slopes within the Figure step 3. Along with, the increases throughout the solar snap velocity leads to other discontinuities throughout the magnetosheath and you will magnetosphere due to the fact men and women forward and you may reflected compressional waves mentioned above. In any event, i only use quasi-steady state viewpoints following transients within our investigation.