Upcoming Candidate MMS-Cluster-THEMIS Conjunctions Within the Magnetosheath, at the Magnetopause and the LLBL C.P. Escoubet1, S.M. Petrinec2, R. Nakamura3,

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Presentation transcript:

Upcoming Candidate MMS-Cluster-THEMIS Conjunctions Within the Magnetosheath, at the Magnetopause and the LLBL C.P. Escoubet1, S.M. Petrinec2, R. Nakamura3, J. Hwang4, S. Toledo5 and the MMS-Cluster ISSI team 1ESA/ESTEC; 2Lockheed Martin Advanced Technology Center; 3Space Research Institute, Austria; 4Southwest Research Institute; 5IRAP/CNRS Abstract. The MMS constellation continues its extended mission at a raised apogee of ~29.3 RE, with highly elliptic 3-day orbits that sweep the dayside magnetosphere/magnetosheath/solar wind from local noon towards the dawn terminator and flank. Other operating missions (Cluster and THEMIS) also continue to actively sample the plasmas and fields of these regions of space. As such, during the next few months several candidate conjunction opportunities exist between these missions. This poster describes the most likely of these upcoming conjunction opportunities for which multi-point observations over a large range of spatial scales can be fully utilized. A sampling of candidate conjunctions – projections of orbit segments 2019/03/15 14:00-18:00 (Magnetosheath/Magnetopause) 2019/05/10 11:00-15:00 (Magnetosheath C4-MMS1 < 5 RE) 2019/06/10 19:20 (Magnetopause skimming) Cluster Cluster MMS Cluster MMS THEMIS MMS THEMIS THEMIS View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun Operating models used; criteria for conjunctions Magnetopause: Shue et al. 1997 model: rv2=1.9 nPa, IMF Bz = 0 nT ‘conjunction’ relies on MP crossing times: |TCl – TMMS| < 3hr Magnetosheath: Model magnetosheath region uses: Bow shock: modified Fairfield 1971 model Magnetopause: Roelof and Sibeck 1993 model ‘conjunction’ relies on spatial separation between C4 and MMS 1 when both are in magnetosheath High Latitude Boundary Layer (HLBL) and Low Latitude Boundary Layer (LLBL): Annular volume of thickness D defined just inside magnetopause. D widens from 0.4 RE at the terminator to a fixed 4 RE tailward of X=-40 RE LLBL: Location within D of MP; |Z| ≤ 3 RE from neutral sheet HLBL: Location within D of MP; |Z| > 3 RE from neutral sheet 2019/04/15 22:00-2019/04/16 02:00 (Magnetosheath C4-MMS1 < 5 RE) 2019/05/17 08:30-14:00 (Magnetosheath - nice constellation < 2 RE) 2019/06/13 14:00 (Magnetopause skimming, Cluster inside MP, MMS outside) Cluster Cluster MMS Cluster MMS THEMIS MMS THEMIS THEMIS View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun MMS-Cluster conjunctions:* *THEMIS A, D, E in the magnetotail during entire period 2019/04/22 23:00- 2019/04/23 03:00 (Magnetosheath/Magnetopause) 2019/05/24 09:00 (Magnetosheath C4-MMS1 < 5 RE) 2019/06/17 15:00 (Magnetopause skimming, Cluster & MMS inside MP) Candidate Intervals (UT): 2019/03/15 14:00-18:00 (Msheath/Mpause) 2019/03/30 03:00-07:00 (Mpause) 2019/04/02 16:00-20:00 (Mpause) 2019/04/15 22:00 - 2019/04/16 02:00 (Msheath) 2019/04/19 12:30-16:30 (Mpause) 2019/04/22 23:00 - 2019/04/23 03:00 (Msheath/Mpause) 2019/04/30 20:00 - 2019/05/01 00:00 (Mpause) 2019/05/03 11:00-15:00 (Msheath) 2019/05/04 06:30-10:30 (Mpause) 2019/05/10 11:00-15:00 (Msheath) 2019/05/17 08:30-14:00 (Msheath) 2019/05/22 03:00-07:00 (Mpause) 2019/05/24 07:30-13:30 (Mpause + Msheath) 2019/05/25 19:00 - 2019/05/26 20:00 (Msheath) 2019/05/30 08:00 - 2019/05/31 07:00 (Msheath) 2019/06/01 19:00 - 2019/06/02 13:00 (Msheath) 2019/06/03 04:00-23:59 (Msheath) 2019/06/09 00:00-05:00 Cluster and MMS skimming MP 2019/06/10 17:00-21:30 Cluster and MMS skimming MP 2019/06/13 00:00-14:00 Cluster and MMS skimming MP 2019/06/17 15:00-17:00 Cluster and MMS skimming MP 2019/06/19 21:30 - 2019/06/20 04:30 HLBL or LLBL MMS Cluster Cluster Cluster THEMIS MMS MMS THEMIS THEMIS Cluster/MMS separation in magnetosheath Threshold separation View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun 2019/05/03 11:00-15:00 (Magnetosheath C2-MMS1 < 5 RE) 2019/06/09 02:40 (Magnetopause skimming) 2019/06/20 04:00 (Cluster & MMS in HLBL or LLBL) Cluster MMS Cluster Cluster THEMIS THEMIS MMS THEMIS MMS View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun View from above equator (Sun at top) View from Sun SUMMARY 22 predicted Cluster-MMS conjunctions at magnetopause/magnetosheath/BL between 2019 March 15 and June 20 Cluster and MMS in magnetotail after 2019 June 20 Plan to use 4h burst mode on Cluster for most conjunctions Tail conjunctions not looked at yet