Details
| Original language | English |
|---|---|
| Article number | 167 |
| Number of pages | 15 |
| Journal | Astrophysical Journal |
| Volume | 874 |
| Issue number | 2 |
| Publication status | Published - 4 Apr 2019 |
Abstract
Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n -1 were observed between 2016 February 18 and 2017 July 3 on board the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 at 1.5 ×10 6 km from Earth. The energy dependence of three Forbush decreases is studied and reported here. A comparison of these observations with others carried out in space down to the energy of a few tens of MeV n -1 shows that the same GCR flux parameterization applies to events of different intensity during the main phase. FD observations in L1 with LPF and geomagnetic storm occurrence are also presented. Finally, the characteristics of GCR flux non-recurrent variations (peaks and depressions) of duration <2 days and their association with interplanetary structures are investigated. It is found that, most likely, plasma compression regions between subsequent corotating high-speed streams cause peaks, while heliospheric current sheet crossing causes the majority of the depressions.
Keywords
- cosmic rays, instrumentation: interferometers, interplanetary medium, solar-terrestrial relations, Sun: heliosphere
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Astronomy and Astrophysics
- Earth and Planetary Sciences(all)
- Space and Planetary Science
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In: Astrophysical Journal, Vol. 874, No. 2, 167, 04.04.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Forbush Decreases and <2 Day GCR Flux Non-recurrent Variations Studied with LISA Pathfinder
AU - LISA Pathfinder Collaboration
AU - Armano, M.
AU - Audley, H.
AU - Baird, J.
AU - Benella, S.
AU - Binetruy, P.
AU - Born, M.
AU - Bortoluzzi, D.
AU - Castelli, E.
AU - Cavalleri, A.
AU - Cesarini, A.
AU - Cruise, A. M.
AU - Danzmann, K.
AU - Silva, M. De Deus
AU - Diepholz, I.
AU - Dixon, G.
AU - Dolesi, R.
AU - Fabi, M.
AU - Ferraioli, L.
AU - Ferroni, V.
AU - Finetti, N.
AU - Fitzsimons, E. D.
AU - Freschi, M.
AU - Gesa, L.
AU - Gibert, F.
AU - Giardini, D.
AU - Giusteri, R.
AU - Grimani, C.
AU - Grzymisch, J.
AU - Harrison, I.
AU - Heinzel, G.
AU - Hewitson, M.
AU - Hollington, D.
AU - Hoyland, D.
AU - Hueller, M.
AU - Inchauspé, H.
AU - Jennrich, O.
AU - Jetzer, P.
AU - Karnesis, N.
AU - Kaune, B.
AU - Korsakova, N.
AU - Killow, C. J.
AU - Kudela, K.
AU - Laurenza, M.
AU - Lobo, J. A.
AU - Lloro, I.
AU - Liu, L.
AU - López-zaragoza, J. P.
AU - Maarschalkerweerd, R.
AU - Mance, D.
AU - Meshksar, N.
AU - Paczkowski, S.
AU - Reiche, Jens
AU - Wanner, Gudrun
AU - Wissel, L.
AU - Wittchen, A.
PY - 2019/4/4
Y1 - 2019/4/4
N2 - Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n -1 were observed between 2016 February 18 and 2017 July 3 on board the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 at 1.5 ×10 6 km from Earth. The energy dependence of three Forbush decreases is studied and reported here. A comparison of these observations with others carried out in space down to the energy of a few tens of MeV n -1 shows that the same GCR flux parameterization applies to events of different intensity during the main phase. FD observations in L1 with LPF and geomagnetic storm occurrence are also presented. Finally, the characteristics of GCR flux non-recurrent variations (peaks and depressions) of duration <2 days and their association with interplanetary structures are investigated. It is found that, most likely, plasma compression regions between subsequent corotating high-speed streams cause peaks, while heliospheric current sheet crossing causes the majority of the depressions.
AB - Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n -1 were observed between 2016 February 18 and 2017 July 3 on board the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 at 1.5 ×10 6 km from Earth. The energy dependence of three Forbush decreases is studied and reported here. A comparison of these observations with others carried out in space down to the energy of a few tens of MeV n -1 shows that the same GCR flux parameterization applies to events of different intensity during the main phase. FD observations in L1 with LPF and geomagnetic storm occurrence are also presented. Finally, the characteristics of GCR flux non-recurrent variations (peaks and depressions) of duration <2 days and their association with interplanetary structures are investigated. It is found that, most likely, plasma compression regions between subsequent corotating high-speed streams cause peaks, while heliospheric current sheet crossing causes the majority of the depressions.
KW - cosmic rays
KW - instrumentation: interferometers
KW - interplanetary medium
KW - solar-terrestrial relations
KW - Sun: heliosphere
UR - http://www.scopus.com/inward/record.url?scp=85064462701&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab0c99
DO - 10.3847/1538-4357/ab0c99
M3 - Article
VL - 874
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 167
ER -