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Solar Wind Streams and Stream Interaction Regions Observed by the Parker Solar Probe with Corresponding Observations at 1 au

Allen, R. C. and Lario, D. and Odstrcil, D. and Ho, G. C. and Jian, L. K. and Cohen, C. M. S. and Badman, S. T. and Jones, S. I. and Arge, C. N. and Mays, M. L. and Mason, G. M. and Bale, S. D. and Bonnell, J. W. and Case, A. W. and Christian, E. R. and Dudok de Wit, T. and Goetz, K. and Harvey, P. R. and Henney, C. J. and Hill, M. E. and Kasper, J. C. and Korreck, K. E. and Larson, D. and Livi, R. and MacDowall, R. J. and Malaspina, D. M. and McComas, D. J. and McNutt, R. and Mitchell, D. G. and Pulupa, M. and Raouafi, N. and Schwadron, N. and Stevens, M. L. and Whittlesey, P. L. and Wiedenbeck, M. (2020) Solar Wind Streams and Stream Interaction Regions Observed by the Parker Solar Probe with Corresponding Observations at 1 au. Astrophysical Journal Supplement Series, 246 (2). Art. No. 36. ISSN 1538-4365. doi:10.3847/1538-4365/ab578f.

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Several fast solar wind streams and stream interaction regions (SIRs) were observed by the Parker Solar Probe (PSP) during its first orbit (2018 September–2019 January). During this time, several recurring SIRs were also seen at 1 au at both L1 (Advanced Composition Explorer (ACE) and Wind) and the location of the Solar Terrestrial Relations Observatory-Ahead (STEREO-A). In this paper, we compare four fast streams observed by PSP at different radial distances during its first orbit. For three of these fast stream events, measurements from L1 (ACE and Wind) and STEREO-A indicated that the fast streams were observed by both PSP and at least one of the 1 au monitors. Our associations are supported by simulations made by the ENLIL model driven by GONG-(ADAPT-)WSA, which allows us to contextualize the inner heliospheric conditions during the first orbit of PSP. Additionally, we determine which of these fast streams are associated with an SIR and characterize the SIR properties for these events. From these comparisons, we find that the compression region associated with the fast-speed streams overtaking the preceding solar wind can form at various radial distances from the Sun in the inner heliosphere inside 0.5 au, with the suprathermal ion population (energies between 30 and 586 keV) observed as isolated enhancements suggesting localized acceleration near the SIR stream interface at ~0.3 au, which is unlike those seen at 1 au, where the suprathermal enhancements extend throughout and behind the SIR. This suprathermal enhancement extends further into the fast stream with increasing distance from the Sun.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemACE mission website ItemSTEREO SEPT data ItemSTEREO Science Center ItemWind data
Allen, R. C.0000-0003-2079-5683
Lario, D.0000-0002-3176-8704
Ho, G. C.0000-0003-1093-2066
Jian, L. K.0000-0002-6849-5527
Cohen, C. M. S.0000-0002-0978-8127
Badman, S. T.0000-0002-6145-436X
Jones, S. I.0000-0001-9498-460X
Mays, M. L.0000-0001-9177-8405
Mason, G. M.0000-0003-2169-9618
Bale, S. D.0000-0002-1989-3596
Case, A. W.0000-0002-3520-4041
Christian, E. R.0000-0003-2134-3937
Dudok de Wit, T.0000-0002-4401-0943
Goetz, K.0000-0003-0420-3633
Harvey, P. R.0000-0002-6938-0166
Henney, C. J.0000-0002-6038-6369
Hill, M. E.0000-0002-5674-4936
Kasper, J. C.0000-0002-7077-930X
Korreck, K. E.0000-0001-6095-2490
Larson, D.0000-0001-5030-6030
Livi, R.0000-0002-0396-0547
MacDowall, R. J.0000-0003-3112-4201
Malaspina, D. M.0000-0003-1191-1558
McComas, D. J.0000-0001-6160-1158
McNutt, R.0000-0002-4722-9166
Mitchell, D. G.0000-0003-1960-2119
Pulupa, M.0000-0002-1573-7457
Raouafi, N.0000-0003-2409-3742
Schwadron, N.0000-0002-3737-9283
Stevens, M. L.0000-0002-7728-0085
Whittlesey, P. L.0000-0002-7287-5098
Wiedenbeck, M.0000-0002-2825-3128
Additional Information:© 2020. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2019 September 15; revised 2019 October 19; accepted 2019 October 21; published 2020 February 3. Early Results from Parker Solar Probe: Ushering a New Frontier in Space Exploration This work was supported under NASA contract NNN06AA01C. The ACE data are publicly available at the ACE mission website: The STEREO SEPT data are available at, and STEREO magnetic field and plasma data can be found at the STEREO Science Center: Wind data are available at The authors would like to thank the Parker Solar Probe instrument teams for the years of work and preparation needed to allow for the new and exciting studies in this special issue and those that will be appearing for years to come. S.D.B. acknowledges the support of the Leverhulme Trust Visiting Professorship program. This work utilizes data produced collaboratively between the Air Force Research Laboratory (AFRL) and the National Solar Observatory. The ADAPT model development is supported by AFRL.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Air Force Research Laboratory (AFRL)UNSPECIFIED
Subject Keywords:Fast solar wind ; Heliosphere ; Interplanetary particle acceleration
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Fast solar wind (1872); Heliosphere (711); Interplanetary particle acceleration (826)
Record Number:CaltechAUTHORS:20200203-092721505
Persistent URL:
Official Citation:R. C. Allen et al 2020 ApJS 246 36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101062
Deposited By: George Porter
Deposited On:03 Feb 2020 22:09
Last Modified:16 Nov 2021 17:58

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