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Upstream Ultra-Low Frequency Waves Observed by MESSENGER's Magnetometer: Implications for Particle Acceleration at Mercury's Bow Shock

التفاصيل البيبلوغرافية
العنوان: Upstream Ultra-Low Frequency Waves Observed by MESSENGER's Magnetometer: Implications for Particle Acceleration at Mercury's Bow Shock
المؤلفون: N. Romanelli, G. DiBraccio, D. Gershman, G. Le, C. Mazelle, K. Meziane, S. Boardsen, J. Slavin, J. Raines, A. Glass, J. Espley
المصدر: Geophysical Research Letters. 47(9)
بيانات النشر: United States: NASA Center for Aerospace Information (CASI), 2020.
سنة النشر: 2020
مصطلحات موضوعية: Geophysics
الوصف: We 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 second” waves observed at the Earth's foreshock, the normalized wave amplitude (δ B /|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.
نوع الوثيقة: Report
اللغة: English
تدمد: 1944-8007
0094-8276
DOI: 10.1029/2020GL087350
URL الوصول: https://ntrs.nasa.gov/citations/20205000840
ملاحظات: 811073.02.52.01.13.27

NNX16AJ05G
رقم الأكسشن: edsnas.20205000840
قاعدة البيانات: NASA Technical Reports
الوصف
تدمد:19448007
00948276
DOI:10.1029/2020GL087350