First Analysis of Ground-Level Enhancement (GLE) 72 on 10 September 2017: Spectral and Anisotropy Characteristics

Mishev, Alexander; Usoskin, Ilya; Raukunen, Osku; Paassilta, Miikka; Валтонен, Э.; Kocharov, L. G.; Vainio, R.

doi:10.1007/s11207-018-1354-x

Cited by 76 publications

(77 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Here we present the derived SEP characteristics, expanding the time interval reported in Mishev et al (2018). The derived rigidity spectra of GLE particles were found to be relatively hard during the event onset (see Figure 2a and Table 1) for a weak event and a softening of the spectra throughout the event was derived (e.g., Mishev et al, , 2018. The derived spectral index after the event onset is in very good agreement with other estimates (e.g., Kataoka Note.…”

Section: Space Weathersupporting

confidence: 77%

“…During the analysis, the background due to GCRs was averaged over 2 hr before the event's onset, and the Forbush decrease started on 7 September 2017 was explicitly considered in our analysis. Here we present the derived SEP characteristics, expanding the time interval reported in Mishev et al (2018). The derived rigidity spectra of GLE particles were found to be relatively hard during the event onset (see Figure 2a and Table 1) for a weak event and a softening of the spectra throughout the event was derived (e.g., Mishev et al, , 2018.…”

Section: Space Weathermentioning

confidence: 82%

See 1 more Smart Citation

Assessment of the Radiation Environment at Commercial Jet‐Flight Altitudes During GLE 72 on 10 September 2017 Using Neutron Monitor Data

Mishev

Usoskin

2018

Space Weather

Self Cite

View full text Add to dashboard Cite

As a result of intense solar activity during the first 10 days of September, a ground level enhancement occurred on 10 September 2017. Here we computed the effective dose rates in the polar region at several altitudes during the event using the derived rigidity spectra of the energetic solar protons. The contribution of different populations of energetic particles, namely, galactic cosmic rays and solar protons, to the exposure is explicitly considered and compared. We also assessed the exposure of a crew members/passengers to radiation at different locations and at several cruise flight altitudes and calculated the received doses for two typical intercontinental flights. The estimated received dose during a high latitude, 40 kft, ∼10‐hr flight is ∼100 μSv.

show abstract

Section: Space Weathersupporting

confidence: 77%

Section: Space Weathermentioning

confidence: 82%

Assessment of the Radiation Environment at Commercial Jet‐Flight Altitudes During GLE 72 on 10 September 2017 Using Neutron Monitor Data

Mishev

Usoskin

2018

Space Weather

Self Cite

View full text Add to dashboard Cite

show abstract

“…We consider the modified power law in rigidity as the spectral shape of SEP fluence (e.g. Cramp et al, 1997;Mishev et al, 2018):…”

Section: Nm Effective Rigidity For Glementioning

confidence: 99%

“…The reconstruction (red dots) is based on the effective-rigidity method introduced here, using the Mi13 YF. The full reconstruction, based on the full inversion of the NM responses, which accounts for the anisotropy of the impulsive phase and temporal evolution of the SEP energy spectrum throughout the events (e.g., Mishev et al, 2018), using the same Mi13 YF, is shown as the blue dashed line. One can observe that, while the shapes of the spectra are nearly identical within the error bars, the full reconstruction agrees within 10% with respect to the method presented here.…”

Section: Nm Namementioning

confidence: 99%

New Method of Assessment of the Integral Fluence of Solar Energetic (> 1 GV Rigidity) Particles from Neutron Monitor Data

Koldobskiy

Kovaltsov²,

Mishev

et al. 2019

Sol Phys

Self Cite

View full text Add to dashboard Cite

A new method to reconstruct the high-rigidity part (≥ 1 GV) of the spectral fluence of solar energetic particles (SEP) for GLE events, based on the worldwide neutron monitor (NM) network data, is presented. The method is based on the effective rigidity R eff and scaling factor K eff. In contrast to many other methods based on derivation of the bestfit parameters of a prescribed spectral shape, it provides a true non-parametric (viz. free of a priori assumptions on the exact spectrum) estimate of fluence. We reconstructed the SEP fluences for two recent GLE events,

show abstract

“…The increase in CR intensity during the GLE began at about 16:00:00 UT. The increase was significant for the DOMC and SOPO data (Mishev et al, ), while negligible for the LMKS station which is located in Slovakia and characterized by a higher cutoff rigidity of 3.84 GV.…”

Section: Description Of the September 2017 Solar Eventmentioning

confidence: 97%

Analysis of the Forbush Decreases and Ground‐Level Enhancement on September 2017 Using Neutron Spectrometers Operated in Antarctic and Midlatitude Stations

Hubert

Pazianotto

Federico³

et al. 2019

JGR Space Physics

View full text Add to dashboard Cite

This work investigates solar events occurred in September 2017 characterized by a series of Forbush decreases and a ground level enhancement (GLE). Forbush decreases is a rapid decrease in the observed https://en.wikipedia.org/wiki/Galactic_cosmic_ray intensity following a coronal mass ejection while GLE is induced by a strong solar event for which the flux of high‐energy solar particles is sufficient to enhance the radiation level on the ground. These investigations were performed using data recorded by a neutron spectrometer network composed of a Bonner sphere system. Two instruments located at Pic‐du‐Midi Observatory (+2,885 m above sea level) and at Concordia station (Antarctica, +3,233 m) record simultaneously and continuously the neutron spectra, allowing to consider short‐term variations during solar events. The main objective is to analyze neutron spectral properties including their energy distributions and dynamics. This paper presents cosmic ray‐induced neutron spectra during active solar event leading to changes in the local cosmic ray spectrum (Forbush decreases and a GLE). Concerning the GLE, analyses show that neutrons in the evaporation domain are particularly amplified during the GLE, while other energetic domains increase uniformly.

show abstract

First Analysis of Ground-Level Enhancement (GLE) 72 on 10 September 2017: Spectral and Anisotropy Characteristics

Cited by 76 publications

References 57 publications

Assessment of the Radiation Environment at Commercial Jet‐Flight Altitudes During GLE 72 on 10 September 2017 Using Neutron Monitor Data

Assessment of the Radiation Environment at Commercial Jet‐Flight Altitudes During GLE 72 on 10 September 2017 Using Neutron Monitor Data

New Method of Assessment of the Integral Fluence of Solar Energetic (> 1 GV Rigidity) Particles from Neutron Monitor Data

Analysis of the Forbush Decreases and Ground‐Level Enhancement on September 2017 Using Neutron Spectrometers Operated in Antarctic and Midlatitude Stations

Contact Info

Product

Resources

About