Daytime midlatitude plasma depletions observed by Swarm: Topside signatures of the rocket exhaust. Issue 5 (4th March 2016)

• Record Type: Journal Article
• Authors: Park, Jaeheung; Kil, Hyosub; Stolle, Claudia; Lühr, Hermann; Coley, William R.; Coster, Anthea; Kwak, Young‐Sil
• Is Part Of: Geophysical research letters. Volume 43:Issue 5(2016)
• Page Start: 1802
• Page End: 1809
• Publication Date: 2016-03-04
• Subjects: daytime midlatitude plasma depletions -- rocket exhaust depletions -- Swarm constellation; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2016GL067810
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: The daytime midlatitude plasma depletions (DMLPDs) observed on 22 May 2014 and 20 May 2015 by the Swarm constellation are not explained by any known natural phenomena. The DMLPDs were detected after rocket launches, and the DMLPD traces converged to the launch station. The event in 2015, for which sufficient total electron content (TEC) data are available, is accompanied with TEC depletion lasting for about 6 h. The persistence generally agrees with the lifetime expected for rocket exhaust depletions (REDs) which is determined by the recombination of the ionospheric oxygen ion with water molecules in the rocket exhaust. These results lead to the conclusion that DMLPDs are REDs in the topside. The RED characteristics identified from the observations on both days are (1) enhancement in electron temperature, (2) reduction in electron pressure, and (3) absence of substructures down to scale sizes of about 8 km (Nyquist's scale size). Key Points: The Swarm detected daytime midlatitude plasma depletions of unknown sources Temporal/spatial proximity to rocket launches indicates that they are rocket exhaust depletions The characteristics identified by this study can help differentiate natural and man‐made phenomena