Comments on "New Insights from the 2003 Halloween Storm into the Colaba 1600 nT Magnetic Depression during the 1859 Carrington Storm" by S. Ohtani (2022)
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arXiv
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866917764239720448 |
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| author | Tsurutani, Bruce T. Lakhina, Gurbax S. Hajra, Rajkumar |
| author_facet | Tsurutani, Bruce T. Lakhina, Gurbax S. Hajra, Rajkumar |
| contents | The Colaba, India ~-1600 nT magnetic spike caused by an interplanetary sheath magnetic field inducing a "dayside R1-field aligned current wedge" during the Carrington magnetic storm proposed by Ohtani (2022, https://doi.org/10.1029/2022JA030596) seems highly improbable. Normal interplanetary magnetic field intensities of ~5 nT have previously been shown to be sufficient to explain the ~+120 nT SI+ observed at Colaba during the storm (Tsurutani et al., 2018, https://doi.org/10.1002/2017JA024779). Magnetohydrodynamic theory (Kennel et al., 1985, https://doi.org/10.1029/GM034p0001) predicts a maximum of 4x magnetic field compression by a fast shock, giving an interplanetary sheath field of ~20 nT, a value too low to support the Ohtani (2022) hypothesis. The Ohtani (2022) (and Siscoe et al. 2006, https://doi.org/10.1016/j.asr.2005.02.102) claim of a further 10x amplification of the interplanetary sheath fields has not been verified in near-Earth interplanetary sheaths. The original (Tsurutani et al., 2003, https://doi.org/10.1029/2002JA009504) hypothesis that an ICME magnetic cloud having southward magnetic fields of ~90 nT caused the Carrington magnetic storm main phase of peak SYM-H/Dst = -1760 nT seems more likely. The short time between the SI+ and the storm main phase onset implies a foreshortened interplanetary sheath. The extremely rapid recovery of the magnetic storm was hypothesized by Tsurutani et al. (2018, https://doi.org/10.1002/2017JA024779) as being due to nonlinear ring current losses. We point out that the Hydro-Quebec 1989 storm was caused by multiple shock-sheaths and magnetic clouds (Lakhina & Tsurutani, 2016, https://doi.org/10.1186/s40562-016-0037-4) unlike the interplanetary causes of the Carrington storm. The Hydro-Quebec event was a "stealth" magnetic storm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_10043 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Comments on "New Insights from the 2003 Halloween Storm into the Colaba 1600 nT Magnetic Depression during the 1859 Carrington Storm" by S. Ohtani (2022) Tsurutani, Bruce T. Lakhina, Gurbax S. Hajra, Rajkumar Space Physics The Colaba, India ~-1600 nT magnetic spike caused by an interplanetary sheath magnetic field inducing a "dayside R1-field aligned current wedge" during the Carrington magnetic storm proposed by Ohtani (2022, https://doi.org/10.1029/2022JA030596) seems highly improbable. Normal interplanetary magnetic field intensities of ~5 nT have previously been shown to be sufficient to explain the ~+120 nT SI+ observed at Colaba during the storm (Tsurutani et al., 2018, https://doi.org/10.1002/2017JA024779). Magnetohydrodynamic theory (Kennel et al., 1985, https://doi.org/10.1029/GM034p0001) predicts a maximum of 4x magnetic field compression by a fast shock, giving an interplanetary sheath field of ~20 nT, a value too low to support the Ohtani (2022) hypothesis. The Ohtani (2022) (and Siscoe et al. 2006, https://doi.org/10.1016/j.asr.2005.02.102) claim of a further 10x amplification of the interplanetary sheath fields has not been verified in near-Earth interplanetary sheaths. The original (Tsurutani et al., 2003, https://doi.org/10.1029/2002JA009504) hypothesis that an ICME magnetic cloud having southward magnetic fields of ~90 nT caused the Carrington magnetic storm main phase of peak SYM-H/Dst = -1760 nT seems more likely. The short time between the SI+ and the storm main phase onset implies a foreshortened interplanetary sheath. The extremely rapid recovery of the magnetic storm was hypothesized by Tsurutani et al. (2018, https://doi.org/10.1002/2017JA024779) as being due to nonlinear ring current losses. We point out that the Hydro-Quebec 1989 storm was caused by multiple shock-sheaths and magnetic clouds (Lakhina & Tsurutani, 2016, https://doi.org/10.1186/s40562-016-0037-4) unlike the interplanetary causes of the Carrington storm. The Hydro-Quebec event was a "stealth" magnetic storm. |
| title | Comments on "New Insights from the 2003 Halloween Storm into the Colaba 1600 nT Magnetic Depression during the 1859 Carrington Storm" by S. Ohtani (2022) |
| topic | Space Physics |
| url | https://arxiv.org/abs/2304.10043 |