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Title: Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2023JA031596· OSTI ID:1999275
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [4]; ORCiD logo [8]; ORCiD logo [2]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [6]
  1. Los Alamos National Laboratory NM Los Alamos USA, New Jersey Institute of Technology Newark NJ USA
  2. New Jersey Institute of Technology Newark NJ USA
  3. University of Alaska Fairbanks AK Fairbanks USA
  4. Virginia Tech VA Blacksburg USA
  5. Shandong University Weihai China
  6. University of California, Los Angeles CA Los Angeles USA
  7. Space Science Institute CO Boulder USA
  8. Augsburg University MN Minneapolis USA
  9. Princeton Plasma Physics Laboratory Princeton University NJ Princeton USA
  10. University of New Hampshire NH Durham USA

Foreshock transient (FT) events are frequently observed phenomena that are generated by discontinuities in the solar wind. These transient events are known to trigger global-scale magnetic field perturbations (e.g., ULF waves). We report a series of FT events observed by the Magnetospheric Multiscale mission in the upstream bow shock region under quiet solar wind conditions. During the event, ground magnetometers observed significant Pc1 wave activity as well as magnetic impulse events in both hemispheres. Ground Pc1 wave observations show ~8 min time delay (with some time differences) from each FT event which is observed at the bow shock. We also find that the ground Pc1 waves are observed earlier in the northern hemisphere compared to the southern hemisphere. The observation time difference between the hemispheres implies that the source region of the wave is the off-equatorial region.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
89233218CNA000001; 20210528CR; AGS-2027210; 80GSFC17C0018; 80NSSC18K1220; 80NSSC18K0570; OPP-1643700; 80NSSC21K0132; OPP-1744861, NSF-1602560; AGS-2133837; AC02-09CH11466
OSTI ID:
1999275
Alternate ID(s):
OSTI ID: 2000930; OSTI ID: 2004948; OSTI ID: 2006525
Report Number(s):
LA-UR-23-23287; e2023JA031596
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Vol. 128 Journal Issue: 9; ISSN 2169-9380
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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