1. .
Multipoint, galactic cosmic ray observations associated with a series of interplanetary coronal mass ejections: the case study of June 2015
A. Papaioannou1, B. Heber2, A. Anastasiadis1, A. Belov3, K. Herbst2,
E. Eroshenko3, A. Abunin3, M. Abunina3
1IAASARS, National Observatory of Athens, Penteli, Greece
2Christian-Albrechts-Universitat zu Kiel, Germany
3IZMIRAN, Troitsk, Russia
European Space Weather Week 14 (ESWW14)  
Session 4: The role of Interplanetary Coronal Mass Ejections in Space Weather
2017

2. https://cdaw.gsfc.nasa.gov/CME_list/
12-18 June the Sun
> A fast (V=1036 Km/s) Partial Halo occurred on 09 June 20:12 UT.
> A fast (V=1228 km/s) Partial Halo CME was marked on 14 June 04:12.
P Halo
1228 km/s
CH672
> A trans-equatorial CH reached an Earth facing position on June Its influence was marked at Earth @ June 2015 l
Data Sources: l
European Space Weather Week (ESWW)
Session 4 The role of Interplanetary Coronal Mass Ejections in Space Weather
Oostende

3. European Space Weather Week (ESWW)
Recap
Effects of CMEs / ICMEs
CME
Magnetic Field Line
ICME
Energetic particles
> Energetic particles accelerated near Sun occur 5-20 min after the lift-off of the CME
> Charged particles follow the magnetic field line
> Particles arrive at Earth minutes later, if Earth is near the right magnetic field line
> Interplanetary CME arrives at 1 AU
18 hours to 4 days later
> The ICME suppresses Galactic cosmic rays, an effect called a Forbush decrease
Adapted from Bieber, 2011
European Space Weather Week (ESWW)
Session 4 The role of Interplanetary Coronal Mass Ejections in Space Weather
Oostende

4. 12-18 June 2015 l Response of GCRs @ Earth
> A shock was Wind on June 12:33 UT. CH672 influenced Earth between June. Both effects provided a clear response on the GCRs (10 GV) [see Figure]
Earth
Date –Time – Amplitude(%)
@ June : %
@ June : %
@ June : %
IMF SW
GCRs (10 GV)
Anisotropy T
SW density
T index β
IMF SW
Data Sources:
European Space Weather Week (ESWW)
Session 4 The role of Interplanetary Coronal Mass Ejections in Space Weather
Oostende

5. 12-18 June 2015 l FDs @ SoHO/EPHINA
SoHO/EPHIN Sensor B C G D E F
> Relative positions of SoHO, Wind and the Earth
> Wind recorded a Fast Forward (FF) shock on DOY 12:33 UT . Consequently a decrease is identified in the count-rate of SoHO/EPHIN detector G (anti-coicidence)
> The onset date-time June 13 – 12:00 [ambiguous due to the preceding data gaps]
> An SEP event occurs at the recovery phase of the decrease @ June :00.
> Another decrease of larger amplitude June 14 and lasts up until June 17.
@ June 2015 l
Data Sources:
4D Orbit viewer NASA
ipshocks.fi
European Space Weather Week (ESWW)
Session 4 The role of Interplanetary Coronal Mass Ejections in Space Weather
Oostende

6. FDs @ SoHO/EPHIN & Earth
Conclusions
SoHO/EPHIN & Earth
> The first CME interacts with a stream from CH672 , reaches the Earth and a reduction in the intensity of GCRs is marked  a Forbush decrease
> The second CME accelerates particles leading to an SEP SoHO/EPHIN
> Finally, SoHO remains within the influence of the stream and a second FD is marked.
Earth 10 GV particles are modulated by both the first CME and the stream leading to, respectively, two FDs.
European Space Weather Week (ESWW)
Session 4 The role of Interplanetary Coronal Mass Ejections in Space Weather
Oostende