التفاصيل البيبلوغرافية
| العنوان: |
Is the interplanetary shock a source of upstream and downstream waves? |
| المؤلفون: |
Goncharov, O., Safrankova, J., Nemecek, Z., Koval, A., Szabo, A., Prech, L. |
| المصدر: |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| سنة النشر: |
2023 |
| المجموعة: |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
| الوصف: |
Observational and theoretical studies as well as simulations have shown that interplanetary (IP) shocks are associated with different types of waves that can exist in their upstream and downstream regions. The nature of upstream and downstream wave packets depends upon the shock strength and geometry expressed by the Mach number, and the angle between the shock normal and the upstream magnetic field. Low-Mach number weak shocks are the result of a balance between the nonlinear steepening and either dissipation due to some anomalous processes or wave dispersion. High-frequency (HF) (several Hz) wave packets in the upstream region of quasi-perpendicular shocks are observed in fast magnetic field data and provide a strong evidence that these shocks have magnetosonic whistler precursors with frequencies up to 7 Hz. On the other hand, low-frequency (LF) waves (up to 1 Hz) are more frequently registered in the downstream region behind the shock. In this work, we present the analysis of low-Mach number and low-beta nearly perpendicular shocks with similar upstream and downstream frequencies in the spacecraft frame. A deeper analysis revealed that these frequencies are identical in the shock frame of reference. Such observations are consistent with the oscillations generated at the shock and launching waves that propagate simultaneously into upstream and downstream regions. The frequency of the waves in the shock frame suggests the protons gyrating at the shock ramp as a possible source of the observed waves. |
| نوع الوثيقة: |
conference object |
| اللغة: |
English |
| Relation: |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016462 |
| الاتاحة: |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016462 |
| رقم الانضمام: |
edsbas.29F78170 |
| قاعدة البيانات: |
BASE |