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This document summarizes how ultra-low frequency (ULF) hydromagnetic power is typically characterized in the deep polar cap. It presents median power values as a function of frequency band, magnetic field direction, location, and local time using data from multiple polar cap stations including AGO5, AGO6, SPA, and MCM. Graphs of median-relative spectra are shown for AGO5 at 87°S CGMLat to illustrate the visualization techniques.
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be the case for NGC1052, to launch these jets. This requires magnetic fields on the order of 103 G to 104 G. We imaged the vicinity
of the SMBH of the AGN NGC1052 with the Global Millimetre VLBI Array and found a bright and compact central feature that is
smaller than 1.9 light days (100 Schwarzschild radii) in radius. Interpreting this as a blend of the unresolved jet bases, we derive the
magnetic field at 1 Schwarzschild radius to lie between 200 G and 8:3 104 G consistent with Blandford & Znajek models.
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polar-cap-power
- 1. How is ultra-low frequency (ULF) hydromagnetic power typically characterized in the deep polar cap? AGO5 Noon (87*S CGMLat) AGO6 Noon (85*S CGMLat) SPA Noon (75*S CGMLat) MCM Noon (80*S CGMLat) Pc6 Pc5 Pc4 N E V Median Power …as a function of… (i) frequency band (row), (ii) magnetic field direction (column), (iii) location (color), and " (iv) local time (x axis) Kevin Urban: Sample Visualizations from Rethinking the Polar Cap (JGR, 2016)
- 2. Median-Relative Spectra = (Dynamic Spectra) / (Time-Independent Median Spectrum) AGO5 @ 87*S CGMLat 100 10 1 0.1 0.01 0.001 1e-‐4 1e-‐5 1e-‐6 1e-‐7 1-‐e-‐8 nT2 Pc7 Pc6 Pc5 Pc4 Pc3 Pc7 Pc6 Pc5 Pc4 Pc3 50 25 10 5.0 2.0 1.0 0.50 0.20 0.10 0.04 0.01 Pc7 Pc6 Pc5 Pc4 Pc3 Pc7 Pc6 Pc5 Pc4 Pc3 Pmed{f} Kevin Urban: Sample Visualizations from Rethinking the Polar Cap (JGR, 2016)
- 3. AGO5 @ 87*S CGMLat AGO6 @ 85*S CGMLat MCM @ 80*S CGMLat CGM EDA EDD AGO5 VOS DMC AGO6 MIR AGO1 AGO4 MCM CSY DRV TNB SBA SUD SPA DVS 2001 50 25 10 5.0 2.0 1.0 0.50 0.20 0.10 0.04 0.01 Pmed{f} Pc7 Pc6 Pc5 Pc4 Pc3 Pc7 Pc6 Pc5 Pc4 Pc3 Pc7 Pc6 Pc5 Pc4 Pc3 How is ultra-low frequency (ULF) hydromagnetic power typically characterized in the deep polar cap? Kevin Urban: Sample Visualizations from Rethinking the Polar Cap (JGR, 2016)