- Note.Runs: 1 = The noncoupled SWMF (v20140611); 2 = an identical noncoupled SWMF which have ionospheric conductivity out-of ten S as an alternative of 5 S; step three = an identical model with an incredibly highest ionospheric conductivity one hundred S; cuatro = a comparable model which have good dipole tilt 30° in the xz airplanes; 5 = the brand new SWMF SIMI (interior magnetosphere-ionosphere) v20180525; six = brand new LFM-Mix. The language “Density” and “Velocity” imply that only occurrence and you may speed was https://www.datingranking.net/pl/largefriends-recenzja basically improved, “Northward” and you may “Southward” suggest the fresh new IMF direction.
Both the occurrence and you can velocity jumps are nonstationary structures because the one another of them do not meet up with the Rankine-Hugoniot affairs
I suggest that the difference in the magnetospheric a reaction to the fresh new occurrence and velocity increases is informed me by the magnetopause magnetic reconnection. In case the thickness increases in addition to acceleration is actually ongoing, even for a good southward IMF, new solar snap electronic community continues to be the same while the magnetopause reconnection price carry out differ insignificantly. The fresh intensification with the latest program weakens the latest magnetospheric magnetized career and movements the fresh new dayside magnetopause earthward, in the sense just like the occurs in the fact out of southward IMF turning (Sibeck, 1994 ).
Therefore, it enhances the magnetospheric-ionospheric currents, specifically the location step 1 most recent
We reveal the fresh new y component of new magnetosheath electric field when you look at the this new inflow region (from the sunward line of magnetopause most recent coating), pure reconnection rates, new proportion of your own inflow velocity with the magnetosheath Alfven price, as well as the reconnection speed normalized into the total solar wind electric occupation in the Profile S2 regarding support advice. New reconnection speed has been determined from the limits of magnetopause current coating as the told me during the Cassak and you can Shay ( 2007 ), Borovsky mais aussi al. ( 2008 ), and you can Borovsky and Birn ( 2014 ). (Figure S1 additionally the associated explanation in the support information provide additional information on the method.) We discover that the difference between the magnetosheath digital field and you can reconnection rate among them works with density and you will acceleration increases resembles the difference on the solar piece of cake electronic career, and also for the instance into the enhanced speed the absolute reconnection speed (while the Ey electronic occupation) on the inflow part increases in time as well as the conclusion off simulator work at gets 2.five times larger than the absolute reconnection rates (otherwise Ey) into the circumstances on increased thickness. not, the reconnection costs normalized with the solar piece of cake electronic profession is almost a comparable in both runs and you may slightly drop-off during the operates from around 0.55 so you’re able to 0.cuatro. This type of philosophy was next to men and women obtained in simulation A great into the Borovsky ainsi que al. ( 2008 ).
Highest reconnection rate intensifies the spot step one newest and you will boosts the mix polar cap potential (CPCP). Shape S3 reveals temporal differences of one’s CPCP into the five operates. For both the northward and you can southward IMF, brand new CPCP develops reduced in the example of velocity increase, however, once again the real difference becomes large on southward IMF. The newest CPCP generally seems to remain generally below a good saturation peak (Hill mais aussi al., 1976 ; Siscoe mais aussi al., 2002 ), although it was around the saturation having a prominent CPCP used in which functions (southward IMF, high velocity). Anyway, we really do not take notice of the effectation of saturation towards magnetopause venue, eg, while deciding the fresh dependencies when you look at the Figure step 3.
The fresh increases on the CPCP in Profile S3 are accompanied by overshoots and undershoots, especially in Runs dos and cuatro into velocity raise. The reason ones transients was informed me by the following. In both cases, the full pressure grows from discontinuities but the upsurge in the fresh new acceleration instantly results in a rise in the fresh new occurrence whenever you are the structure propagates in the solar cinch regarding inflow line to the bend amaze. So it ic pressure around the magnetopause. You will find inspected a possible boost in the density around the subsolar bend surprise when you look at the Runs 2 and you will 4 and discovered you to the newest solar wind density really grows within leaps in the velocity, but at multiple earliest leaps. In case the solar power breeze acceleration are lower, this new propagation time from the inflow boundary to your ribbon shock is enough time therefore, the thickness has actually plenty of time to pile up. However, the fresh new occurrence enhancement falls below step 1% into the acceleration more than five hundred km/s. Since this perception is actually negligible most of the time, we think it will not determine the fresh mountains into the Contour step three. As well as, the latest increases throughout the solar power piece of cake acceleration causes other discontinuities from the magnetosheath and you can magnetosphere due to the fact those pass and you will reflected compressional surf mentioned above. Anyway, i use only quasi-steady state philosophy after the transients within studies.
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