Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A

R. C. Allen; G. C. Ho; G. M. Mason; G. Li; L. K. Jian; S. K. Vines; N. A. Schwadron; C. J. Joyce; S. D. Bale; J. W. Bonnell; A. W. Case; E. R. Christian; C. M.S. Cohen; M. I. Desai; R. Filwett; K. Goetz; P. R. Harvey; M. E. Hill; J. C. Kasper; K. E. Korreck; D. Lario; D. Larson; R. Livi; R. J. MacDowall; D. M. Malaspina; D. J. McComas; R. McNutt; D. G. Mitchell; K. W. Paulson; M. Pulupa; N. Raouafi; M. L. Stevens; P. L. Whittlesey; M. Wiedenbeck

doi:10.1029/2020GL091376

Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A

R. C. Allen, G. C. Ho, G. M. Mason, G. Li, L. K. Jian, S. K. Vines, N. A. Schwadron, C. J. Joyce, S. D. Bale, J. W. Bonnell, A. W. Case, E. R. Christian, C. M.S. Cohen, M. I. Desai, R. Filwett, K. Goetz, P. R. Harvey, M. E. Hill, J. C. Kasper, K. E. KorreckD. Lario, D. Larson, R. Livi, R. J. MacDowall, D. M. Malaspina, D. J. McComas, R. McNutt, D. G. Mitchell, K. W. Paulson, M. Pulupa, N. Raouafi, M. L. Stevens, P. L. Whittlesey, M. Wiedenbeck

Astrophysical Sciences

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17 Scopus citations

Abstract

The addition of Parker Solar Probe (PSP) to the Heliophysics System Observatory has allowed for the unprecedented ability to study Corotating Interaction Regions (CIRs) at multiple radial distances without significant temporal/longitudinal variations. On September 19, 2019, PSP observed a CIR at ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼1 au, allowing for an unambiguous assessment of the radial evolution of a single CIR. Bulk plasma and magnetic field signatures of the CIR evolve in a fashion characteristic to previous observations; however, the suprathermal ions are enhanced over a larger longitudinal range at PSP than at STEREO-A, although at much lower intensities. The longitudinal spread appears to be largely a consequence of magnetic field line topology at CIRs between the compressed slow solar wind upstream and high-speed stream following the CIR, underscoring the importance of the large-scale topology of these structures.

Original language	English (US)
Article number	e2020GL091376
Journal	Geophysical Research Letters
Volume	48
Issue number	3
DOIs	https://doi.org/10.1029/2020GL091376
State	Published - Feb 16 2021

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

Keywords

CIRs
Parker Solar Probe
STEREO
solar wind
suprathermal ions

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10.1029/2020GL091376

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Allen, R. C., Ho, G. C., Mason, G. M., Li, G., Jian, L. K., Vines, S. K., Schwadron, N. A., Joyce, C. J., Bale, S. D., Bonnell, J. W., Case, A. W., Christian, E. R., Cohen, C. M. S., Desai, M. I., Filwett, R., Goetz, K., Harvey, P. R., Hill, M. E., Kasper, J. C., ... Wiedenbeck, M. (2021). Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A. Geophysical Research Letters, 48(3), Article e2020GL091376. https://doi.org/10.1029/2020GL091376

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title = "Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A",

abstract = "The addition of Parker Solar Probe (PSP) to the Heliophysics System Observatory has allowed for the unprecedented ability to study Corotating Interaction Regions (CIRs) at multiple radial distances without significant temporal/longitudinal variations. On September 19, 2019, PSP observed a CIR at ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼1 au, allowing for an unambiguous assessment of the radial evolution of a single CIR. Bulk plasma and magnetic field signatures of the CIR evolve in a fashion characteristic to previous observations; however, the suprathermal ions are enhanced over a larger longitudinal range at PSP than at STEREO-A, although at much lower intensities. The longitudinal spread appears to be largely a consequence of magnetic field line topology at CIRs between the compressed slow solar wind upstream and high-speed stream following the CIR, underscoring the importance of the large-scale topology of these structures.",

keywords = "CIRs, Parker Solar Probe, STEREO, solar wind, suprathermal ions",

author = "Allen, {R. C.} and Ho, {G. C.} and Mason, {G. M.} and G. Li and Jian, {L. K.} and Vines, {S. K.} and Schwadron, {N. A.} and Joyce, {C. J.} and Bale, {S. D.} and Bonnell, {J. W.} and Case, {A. W.} and Christian, {E. R.} and Cohen, {C. M.S.} and Desai, {M. I.} and R. Filwett and K. Goetz and Harvey, {P. R.} and Hill, {M. E.} and Kasper, {J. C.} and Korreck, {K. E.} and D. Lario and D. Larson and R. Livi and MacDowall, {R. J.} and Malaspina, {D. M.} and McComas, {D. J.} and R. McNutt and Mitchell, {D. G.} and Paulson, {K. W.} and M. Pulupa and N. Raouafi and Stevens, {M. L.} and Whittlesey, {P. L.} and M. Wiedenbeck",

note = "Publisher Copyright: {\textcopyright} 2021. The Authors.",

year = "2021",

month = feb,

day = "16",

doi = "10.1029/2020GL091376",

language = "English (US)",

volume = "48",

journal = "Geophysical Research Letters",

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Allen, RC, Ho, GC, Mason, GM, Li, G, Jian, LK, Vines, SK, Schwadron, NA, Joyce, CJ, Bale, SD, Bonnell, JW, Case, AW, Christian, ER, Cohen, CMS, Desai, MI, Filwett, R, Goetz, K, Harvey, PR, Hill, ME, Kasper, JC, Korreck, KE, Lario, D, Larson, D, Livi, R, MacDowall, RJ, Malaspina, DM, McComas, DJ, McNutt, R, Mitchell, DG, Paulson, KW, Pulupa, M, Raouafi, N, Stevens, ML, Whittlesey, PL & Wiedenbeck, M 2021, 'Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A', Geophysical Research Letters, vol. 48, no. 3, e2020GL091376. https://doi.org/10.1029/2020GL091376

TY - JOUR

T1 - Radial Evolution of a CIR

T2 - Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A

AU - Allen, R. C.

AU - Ho, G. C.

AU - Mason, G. M.

AU - Li, G.

AU - Jian, L. K.

AU - Vines, S. K.

AU - Schwadron, N. A.

AU - Joyce, C. J.

AU - Bale, S. D.

AU - Bonnell, J. W.

AU - Case, A. W.

AU - Christian, E. R.

AU - Cohen, C. M.S.

AU - Desai, M. I.

AU - Filwett, R.

AU - Goetz, K.

AU - Harvey, P. R.

AU - Hill, M. E.

AU - Kasper, J. C.

AU - Korreck, K. E.

AU - Lario, D.

AU - Larson, D.

AU - Livi, R.

AU - MacDowall, R. J.

AU - Malaspina, D. M.

AU - McComas, D. J.

AU - McNutt, R.

AU - Mitchell, D. G.

AU - Paulson, K. W.

AU - Pulupa, M.

AU - Raouafi, N.

AU - Stevens, M. L.

AU - Whittlesey, P. L.

AU - Wiedenbeck, M.

PY - 2021/2/16

Y1 - 2021/2/16

N2 - The addition of Parker Solar Probe (PSP) to the Heliophysics System Observatory has allowed for the unprecedented ability to study Corotating Interaction Regions (CIRs) at multiple radial distances without significant temporal/longitudinal variations. On September 19, 2019, PSP observed a CIR at ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼1 au, allowing for an unambiguous assessment of the radial evolution of a single CIR. Bulk plasma and magnetic field signatures of the CIR evolve in a fashion characteristic to previous observations; however, the suprathermal ions are enhanced over a larger longitudinal range at PSP than at STEREO-A, although at much lower intensities. The longitudinal spread appears to be largely a consequence of magnetic field line topology at CIRs between the compressed slow solar wind upstream and high-speed stream following the CIR, underscoring the importance of the large-scale topology of these structures.

AB - The addition of Parker Solar Probe (PSP) to the Heliophysics System Observatory has allowed for the unprecedented ability to study Corotating Interaction Regions (CIRs) at multiple radial distances without significant temporal/longitudinal variations. On September 19, 2019, PSP observed a CIR at ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼1 au, allowing for an unambiguous assessment of the radial evolution of a single CIR. Bulk plasma and magnetic field signatures of the CIR evolve in a fashion characteristic to previous observations; however, the suprathermal ions are enhanced over a larger longitudinal range at PSP than at STEREO-A, although at much lower intensities. The longitudinal spread appears to be largely a consequence of magnetic field line topology at CIRs between the compressed slow solar wind upstream and high-speed stream following the CIR, underscoring the importance of the large-scale topology of these structures.

KW - CIRs

KW - Parker Solar Probe

KW - STEREO

KW - solar wind

KW - suprathermal ions

UR - http://www.scopus.com/inward/record.url?scp=85101164058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85101164058&partnerID=8YFLogxK

U2 - 10.1029/2020GL091376

DO - 10.1029/2020GL091376

M3 - Article

AN - SCOPUS:85101164058

SN - 0094-8276

VL - 48

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 3

M1 - e2020GL091376

ER -

Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A

Abstract

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