- Mention.Runs: 1 = The noncoupled SWMF (vdos0140611); 2 = an identical noncoupled SWMF that have ionospheric conductivity away from 10 S instead of 5 S; step 3 = an identical model that have an incredibly large ionospheric conductivity a hundred S; 4 = an identical design with a great dipole tip 31° during the xz airplanes; 5 = the new SWMF SIMI (internal magnetosphere-ionosphere) v20180525; 6 = the LFM-Mix. The text “Density” and “Velocity” indicate that only occurrence and acceleration have been improved, “Northward” and “Southward” mean the newest IMF direction.
Both the occurrence and you may velocity jumps was nonstationary formations just like the each other of these don’t meet the Rankine-Hugoniot relationships
I suggest that the difference on the magnetospheric response to the fresh new density and speed develops is actually told me of the magnetopause magnetized reconnection. In case the density grows as well as the speed was lingering, even for a southward IMF, the newest solar breeze electronic career remains the exact same therefore the magnetopause reconnection price perform differ insignificantly. The fresh new intensification on the latest system weakens the latest magnetospheric magnetized profession and moves the latest dayside magnetopause earthward, in the sense because occurs in the case of southward IMF turning (Sibeck, 1994 ).
In turn, that it enhances the magnetospheric-ionospheric currents, particularly the region step one current
I reveal the brand new y component of new magnetosheath electric field into the this new inflow area (in the sunward edge of your magnetopause current layer), absolute reconnection speed, the ratio of inflow acceleration to the magnetosheath Alfven speed, and the reconnection rate stabilized on the overall solar power breeze electric industry from inside the Contour S2 on the support suggestions. The latest reconnection rates could have been computed within limitations of the magnetopause current coating since informed me https://datingranking.net/pl/flirtwith-recenzja/ within the Cassak and you will Shay ( 2007 ), Borovsky ainsi que al. ( 2008 ), and you may Borovsky and Birn ( 2014 ). (Figure S1 in addition to associated need on the support recommendations offer more information on the process.) We find the difference between the fresh new magnetosheath electronic job and you may reconnection rate between them operates having density and you can speed develops is comparable to the difference regarding the solar cinch electronic occupation, and for the situation on the enhanced velocity absolutely the reconnection rates (and Ey digital industry) regarding inflow part grows over the years at the end away from simulator focus on gets 2.five times bigger than absolutely the reconnection price (otherwise Ey) into the circumstances into improved density. But not, the brand new reconnection prices normalized on solar breeze electric community was almost an equivalent in both operates and you may a little decrease into the runs from around 0.55 so you can 0.4. This type of viewpoints was close to the individuals gotten inside simulator An excellent into the Borovsky mais aussi al. ( 2008 ).
Higher reconnection price intensifies the location step 1 current and you may increases the cross polar cap potential (CPCP). Profile S3 reveals temporal distinctions of your CPCP when you look at the five runs. For both the northward and you will southward IMF, the brand new CPCP grows smaller in the case of acceleration increase, however, once again the real difference becomes generous towards southward IMF. The brand new CPCP appears to will always be generally lower than a great saturation peak (Hill et al., 1976 ; Siscoe ainsi que al., 2002 ), although it is nearby the saturation to have a biggest CPCP included in so it work (southward IMF, high velocity). In any event, we do not observe the effect of saturation on the magnetopause place, such, while deciding the latest dependencies inside Profile step 3.
The latest develops on CPCP for the Contour S3 are accompanied by overshoots and you may undershoots, especially in Works dos and you will cuatro on the speed improve. How come of those transients will be told me from the following. In both cases, the entire pressure grows from discontinuities nevertheless the increase in the fresh new velocity quickly results in a rise in the fresh density if you’re the dwelling propagates regarding solar breeze throughout the inflow border for the bow treat. That it ic pressure nearby the magnetopause. We have inspected a possible rise in the fresh occurrence around the subsolar bow shock in Works dos and cuatro and discovered you to the newest solar power snap occurrence really increases during the jumps when you look at the velocity, but at numerous very first leaps. If your solar power piece of cake speed are lower, the latest propagation day throughout the inflow edge to the bend treat are much time so that the density have plenty of time to stack up. Although not, the latest density improvement falls lower than step 1% on the speed greater than 500 km/s. As this impact are negligible more often than not, we think this cannot influence the newest slopes during the Profile step 3. And, this new expands on solar breeze velocity causes other discontinuities regarding the magnetosheath and you may magnetosphere because the individuals submit and you can shown compressional swells in the list above. In any event, we only use quasi-steady state beliefs pursuing the transients in our study.