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Upstream Ultra‐Low Frequency Waves Observed by MESSENGER’s Magnetometer: Implications for Particle Acceleration at Mercury’s Bow Shock
dc.contributor.authorRomanelli, N.
dc.contributor.authorDiBraccio, G.
dc.contributor.authorGershman, D.
dc.contributor.authorLe, G.
dc.contributor.authorMazelle, C.
dc.contributor.authorMeziane, K.
dc.contributor.authorBoardsen, S.
dc.contributor.authorSlavin, J.
dc.contributor.authorRaines, J.
dc.contributor.authorGlass, A.
dc.contributor.authorEspley, J.
dc.date.accessioned2020-06-03T15:23:01Z
dc.date.availableWITHHELD_12_MONTHS
dc.date.available2020-06-03T15:23:01Z
dc.date.issued2020-05-16
dc.identifier.citationRomanelli, N.; DiBraccio, G.; Gershman, D.; Le, G.; Mazelle, C.; Meziane, K.; Boardsen, S.; Slavin, J.; Raines, J.; Glass, A.; Espley, J. (2020). "Upstream Ultra‐Low Frequency Waves Observed by MESSENGER’s Magnetometer: Implications for Particle Acceleration at Mercury’s Bow Shock." Geophysical Research Letters 47(9): n/a-n/a.
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2027.42/155492
dc.description.abstractWe perform the first statistical analysis of the main properties of waves observed in the 0.05–0.41 Hz frequency range in the Hermean foreshock by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) Magnetometer. Although we find similar polarization properties to the “30 s” waves observed at the Earth’s foreshock, the normalized wave amplitude (δB/|B0|∼0.2) and occurrence rate (∼0.5%) are much smaller. This could be associated with relatively lower backstreaming proton fluxes, the smaller foreshock size and/or less stable solar wind (SW) conditions around Mercury. Furthermore, we estimate that the speed of resonant backstreaming protons in the SW reference frame (likely source for these waves) ranges between 0.95 and 2.6 times the SW speed. The closeness between this range and what is observed at other planetary foreshocks suggests that similar acceleration processes are responsible for this energetic population and might be present in the shocks of exoplanets.Key PointsWe perform the first statistical analysis (4,536 events) of the main properties of the lowest‐frequency waves in the Hermean foreshockSmall normalized wave amplitude (0.2) and occurrence (0.5%) are likely due to low backstreaming proton flux and variable external conditionsThe normalized backstreaming protons speed (∼0.95–2.6) suggests similar acceleration processes occur at several planetary shocks
dc.publisherWiley Periodicals, Inc.
dc.publisherAmerican Institute of Physics
dc.subject.othermagnetic field
dc.subject.otherbackstreaming ions
dc.subject.otherULF waves
dc.subject.otherforeshock
dc.subject.otherMercury
dc.subject.otherbow shock
dc.titleUpstream Ultra‐Low Frequency Waves Observed by MESSENGER’s Magnetometer: Implications for Particle Acceleration at Mercury’s Bow Shock
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/155492/1/grl60476.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/155492/2/grl60476_am.pdf
dc.identifier.doi10.1029/2020GL087350
dc.identifier.sourceGeophysical Research Letters
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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