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Global ENA Imaging and In Situ Observations of Substorm Dipolarization on 10 August 2016.

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Title: Global ENA Imaging and In Situ Observations of Substorm Dipolarization on 10 August 2016.
Authors: Goldstein, J.1,2 jgoldstein@swri.edu, Valek, P. W.1, McComas, D. J.3, Redfern, J.4, Spence, H.5, Skoug, R. M.6, Larsen, B. A.6, D. Reeves, G.6, Nakamura, R.7
Source: Journal of Geophysical Research. Space Physics. Apr2020, Vol. 125 Issue 4, p1-12. 12p.
Subject Terms: *Magnetic storms, Magnetospheric physics, Multiscale modeling, Spectrometers, Magnetotails
Abstract: This paper presents the first combined use of data from Magnetospheric Multiscale (MMS), Two Wide‐angle Imaging Neutral‐atom Spectrometers (TWINS), and Van Allen Probes (RBSP) to study the 10 August 2016 magnetic dipolarization. We report the first correlation of MMS tail observations with TWINS energetic neutral atom (ENA) images of the ring current (RC). We analyze 15‐min, 1° TWINS 2 images in 1–50 keV energy bins. To characterize the high‐altitude RC we extract peak ENA flux from L= 2.5 to 5 in the postmidnight sector. We estimate peak low‐altitude ion flux from ENAs near the Earth's limb. For a local perspective, we use spin‐averaged proton fluxes from the RBSP A Helium Oxygen Proton Electron (HOPE) spectrometer. We find that the 1000 UT dipolarization triggered an abrupt and significant increase in low‐altitude ions and a gradual but modest increase in the high‐altitude RC. The relative strength and timing of the low versus high‐altitude flux indicate that the dipolarization isotropized the injected ions and initially filled the loss cone. The substorm injection brought cooler ions in from the magnetotail, reducing the peak energy at both low and high altitudes. The post‐dipolarization low‐altitude flux exhibited a decay rate dispersion favoring longer decay times at lower energies, possibly caused by growth of the low energy RC providing enhanced flux into the loss cone. A variety of finer scale local injection structures were observed in the high‐altitude RC both before and after the dipolarization, and the average system level RC intensity increased after 1000 UT. Key Points: First combined use of MMS, TWINS, and Van Allen Probes to study response to 10 August 2016 magnetic dipolarization during isolated substormDipolarization triggered abrupt/gradual increase in low/high‐altitude ions, indicating that injection isotropized ions and filled loss coneLarge variety of finer scale local injection structures observed both before and after dipolarization, but average global RC increased [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Global ENA Imaging and In Situ Observations of Substorm Dipolarization on 10 August 2016.
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  Data: <searchLink fieldCode="AR" term="%22Goldstein%2C+J%2E%22">Goldstein, J.</searchLink><relatesTo>1,2</relatesTo><i> jgoldstein@swri.edu</i><br /><searchLink fieldCode="AR" term="%22Valek%2C+P%2E+W%2E%22">Valek, P. W.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22McComas%2C+D%2E+J%2E%22">McComas, D. J.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Redfern%2C+J%2E%22">Redfern, J.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Spence%2C+H%2E%22">Spence, H.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Skoug%2C+R%2E+M%2E%22">Skoug, R. M.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Larsen%2C+B%2E+A%2E%22">Larsen, B. A.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22D%2E+Reeves%2C+G%2E%22">D. Reeves, G.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Nakamura%2C+R%2E%22">Nakamura, R.</searchLink><relatesTo>7</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Apr2020, Vol. 125 Issue 4, p1-12. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Magnetic+storms%22">Magnetic storms</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetospheric+physics%22">Magnetospheric physics</searchLink><br /><searchLink fieldCode="DE" term="%22Multiscale+modeling%22">Multiscale modeling</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrometers%22">Spectrometers</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetotails%22">Magnetotails</searchLink>
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  Label: Abstract
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  Data: This paper presents the first combined use of data from Magnetospheric Multiscale (MMS), Two Wide‐angle Imaging Neutral‐atom Spectrometers (TWINS), and Van Allen Probes (RBSP) to study the 10 August 2016 magnetic dipolarization. We report the first correlation of MMS tail observations with TWINS energetic neutral atom (ENA) images of the ring current (RC). We analyze 15‐min, 1° TWINS 2 images in 1–50 keV energy bins. To characterize the high‐altitude RC we extract peak ENA flux from L= 2.5 to 5 in the postmidnight sector. We estimate peak low‐altitude ion flux from ENAs near the Earth's limb. For a local perspective, we use spin‐averaged proton fluxes from the RBSP A Helium Oxygen Proton Electron (HOPE) spectrometer. We find that the 1000 UT dipolarization triggered an abrupt and significant increase in low‐altitude ions and a gradual but modest increase in the high‐altitude RC. The relative strength and timing of the low versus high‐altitude flux indicate that the dipolarization isotropized the injected ions and initially filled the loss cone. The substorm injection brought cooler ions in from the magnetotail, reducing the peak energy at both low and high altitudes. The post‐dipolarization low‐altitude flux exhibited a decay rate dispersion favoring longer decay times at lower energies, possibly caused by growth of the low energy RC providing enhanced flux into the loss cone. A variety of finer scale local injection structures were observed in the high‐altitude RC both before and after the dipolarization, and the average system level RC intensity increased after 1000 UT. Key Points: First combined use of MMS, TWINS, and Van Allen Probes to study response to 10 August 2016 magnetic dipolarization during isolated substormDipolarization triggered abrupt/gradual increase in low/high‐altitude ions, indicating that injection isotropized ions and filled loss coneLarge variety of finer scale local injection structures observed both before and after dipolarization, but average global RC increased [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2019JA027733
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        Text: English
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      – SubjectFull: Magnetospheric physics
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      – SubjectFull: Multiscale modeling
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      – SubjectFull: Spectrometers
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              Text: Apr2020
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