View in EDS

Using RISR‐N to Resolve Variations in Dayside and Nightside Plasma Density Spatial‐Scales.

Saved in:
Bibliographic Details
Title: Using RISR‐N to Resolve Variations in Dayside and Nightside Plasma Density Spatial‐Scales.
Authors: Goodwin, L. V.1 (AUTHOR) lindsay.v.goodwin@njit.edu, Ivarsen, M.2,3 (AUTHOR), Lamarche, L.4 (AUTHOR), Perry, G. W.1 (AUTHOR), Negrea, C.5 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Nov2024, Vol. 129 Issue 11, p1-9. 9p.
Subject Terms: Plasma density, Incoherent scattering, Plasma diffusion, Zenith distance, Magnetic fields
Abstract: To provide new insights into plasma density scale‐sizes in the polar cap, irregularity spectra are developed and tracked relative to magnetic local time (MLT) and solar zenith angle (SZA). A novel Incoherent Scatter Radar (ISR) technique is applied to develop spectra between 20 and 300 km using 2016 to 2018 imaginglp mode data from Resolute Bay ISR‐North. This technique leverages: (a) volumetric plasma density measurements from Advanced Modular ISRs, (b) the slow F‐region cross‐field plasma diffusion at scales greater than 10 km, and (c) that high‐latitude geomagnetic field lines are nearly vertical. The results of this work find that the largest spectral features within periodograms that use sunlit or dayside plasma densities are predominately above 100 km, indicating that structures that are above 100 km are more common than structures below 100 km in dayside/sunlit plasma. However, the opposite is true when plasma is in the dark or on the nightside, where the largest spectral features are predominately below 100 km. This contrast between the dayside and nightside is symptomatic of photoionization generating structures larger than 100 km, highlighting the role of photoionization or E‐region shorting in removing structures less than 100 km or driving larger scale‐structures more strongly, and the role of other mechanisms (such as flows, recombination, precipitation, and instabilities) in generating small‐scale structures. This paper will discuss these findings in detail, as well as discuss forthcoming works. Plain Language Summary: Plasma density variations in the polar cap are challenging to characterize, and it is difficult to discern what mechanisms create what sizes of "structures". This paper is part of a series of papers that use data from the Resolute Bay Incoherent Scatter Radar‐North to examine the drivers of polar cap variations that are between 20 and 300 km. Focusing on the local time and the angle of the sun, this paper finds that plasma density structures above 100 km are more prevalent in the daylight polar cap ionosphere than structures below 100 km. Meanwhile, plasma density structures below 100 km are more prevalent at night than structures above 100 km. This contrast between day and night indicates the effects of mechanisms that generate structuring only on the dayside and mechanisms that generate structuring anywhere in the polar cap. Key Points: Ionospheric polar cap irregularity spectra between 20 and 300 km are calculated using magnetic field mapping and incoherent scatter radarsThe largest dayside spectral features are typically over 100 km due to photoionization and E‐region shorting removing smaller irregularitiesNightside spectral features suggest important role of flows, recombination, precipitation, and instabilities in breaking down structures [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.)
Database: GreenFILE
FullText Text:
  Availability: 0
Header DbId: 8gh
DbLabel: GreenFILE
An: 181109061
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Using RISR‐N to Resolve Variations in Dayside and Nightside Plasma Density Spatial‐Scales.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Goodwin%2C+L%2E+V%2E%22">Goodwin, L. V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lindsay.v.goodwin@njit.edu</i><br /><searchLink fieldCode="AR" term="%22Ivarsen%2C+M%2E%22">Ivarsen, M.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lamarche%2C+L%2E%22">Lamarche, L.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Perry%2C+G%2E+W%2E%22">Perry, G. W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Negrea%2C+C%2E%22">Negrea, C.</searchLink><relatesTo>5</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Nov2024, Vol. 129 Issue 11, p1-9. 9p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Plasma+density%22">Plasma density</searchLink><br /><searchLink fieldCode="DE" term="%22Incoherent+scattering%22">Incoherent scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+diffusion%22">Plasma diffusion</searchLink><br /><searchLink fieldCode="DE" term="%22Zenith+distance%22">Zenith distance</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: To provide new insights into plasma density scale‐sizes in the polar cap, irregularity spectra are developed and tracked relative to magnetic local time (MLT) and solar zenith angle (SZA). A novel Incoherent Scatter Radar (ISR) technique is applied to develop spectra between 20 and 300 km using 2016 to 2018 imaginglp mode data from Resolute Bay ISR‐North. This technique leverages: (a) volumetric plasma density measurements from Advanced Modular ISRs, (b) the slow F‐region cross‐field plasma diffusion at scales greater than 10 km, and (c) that high‐latitude geomagnetic field lines are nearly vertical. The results of this work find that the largest spectral features within periodograms that use sunlit or dayside plasma densities are predominately above 100 km, indicating that structures that are above 100 km are more common than structures below 100 km in dayside/sunlit plasma. However, the opposite is true when plasma is in the dark or on the nightside, where the largest spectral features are predominately below 100 km. This contrast between the dayside and nightside is symptomatic of photoionization generating structures larger than 100 km, highlighting the role of photoionization or E‐region shorting in removing structures less than 100 km or driving larger scale‐structures more strongly, and the role of other mechanisms (such as flows, recombination, precipitation, and instabilities) in generating small‐scale structures. This paper will discuss these findings in detail, as well as discuss forthcoming works. Plain Language Summary: Plasma density variations in the polar cap are challenging to characterize, and it is difficult to discern what mechanisms create what sizes of "structures". This paper is part of a series of papers that use data from the Resolute Bay Incoherent Scatter Radar‐North to examine the drivers of polar cap variations that are between 20 and 300 km. Focusing on the local time and the angle of the sun, this paper finds that plasma density structures above 100 km are more prevalent in the daylight polar cap ionosphere than structures below 100 km. Meanwhile, plasma density structures below 100 km are more prevalent at night than structures above 100 km. This contrast between day and night indicates the effects of mechanisms that generate structuring only on the dayside and mechanisms that generate structuring anywhere in the polar cap. Key Points: Ionospheric polar cap irregularity spectra between 20 and 300 km are calculated using magnetic field mapping and incoherent scatter radarsThe largest dayside spectral features are typically over 100 km due to photoionization and E‐region shorting removing smaller irregularitiesNightside spectral features suggest important role of flows, recombination, precipitation, and instabilities in breaking down structures [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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=181109061
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1029/2024JA032482
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Plasma density
        Type: general
      – SubjectFull: Incoherent scattering
        Type: general
      – SubjectFull: Plasma diffusion
        Type: general
      – SubjectFull: Zenith distance
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
    Titles:
      – TitleFull: Using RISR‐N to Resolve Variations in Dayside and Nightside Plasma Density Spatial‐Scales.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Goodwin, L. V.
      – PersonEntity:
          Name:
            NameFull: Ivarsen, M.
      – PersonEntity:
          Name:
            NameFull: Lamarche, L.
      – PersonEntity:
          Name:
            NameFull: Perry, G. W.
      – PersonEntity:
          Name:
            NameFull: Negrea, C.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 11
              Text: Nov2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 21699380
          Numbering:
            – Type: volume
              Value: 129
            – Type: issue
              Value: 11
          Titles:
            – TitleFull: Journal of Geophysical Research. Space Physics
              Type: main
ResultId 1