Rigidity dependence of Forbush decreases in the energy region exceeding the sensitivity of neutron monitors

Savić, M.; Veselinović, N.; Dragić, A.; Maletic, D.; Joković, D.; Banjanac, R.; Udovičić, V.

doi:10.1016/j.asr.2018.09.034

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Hermon station exhibit a regular daily variation of 0.5-1% when space weather conditions are quiet [34] ); therefore, a 5% decrease clearly suggests a Forbush decrease from a solar event. This FD was also detected around the world with other NM but also with muon stations, for example, at Oulu, Finland [35] and Belgrade, Serbia [36].…”

Section: Cme Event 6-8 September 2017supporting

confidence: 55%

No Response of Surface-Level Atmospheric Electrical Parameters in Israel to Severe Space Weather Events

Yaniv,

Yair,

Price

et al. 2023

Atmosphere

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We report ground-based measurements of the atmospheric electric field (Ez = −potential gradient (PG)) and current density (Jz) that were conducted at two locations in Israel. One is at the Emilio Segre cosmic ray station located on Mt. Hermon (34.45° N, 2020 m AMSL) in northern Israel near the Syrian-Lebanon border, and the other is at the Wise astronomical observatory in the Negev desert highland plateau of southern Israel (31.18° N, 870 m AMSL). We searched for possible effects of strong, short-term solar events on the potential gradient and the vertical current density, as disruptions to the global electric circuit are often observed following strong solar events. The first case study (St. Patrick’s Day, 17 March 2015) was classified as the strongest event of 2015. The second case study (8 September 2017) was categorized as the strongest event of 2017 and one of the twenty strongest events on record to date. The results show that the electrical parameters measured at ground level at both stations were not affected during the two massive proton events and the ensuing geomagnetic storms. The magnetospheric shielding in lower latitudes is strong enough to shield against the flux of energetic particles from solar events, obscuring any impact that may be noticeable above the local daily variations induced by local meteorological conditions (aerosol concentrations, clouds, high humidity, and wind speed), which were investigated as well.

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Section: Cme Event 6-8 September 2017supporting

confidence: 55%

No Response of Surface-Level Atmospheric Electrical Parameters in Israel to Severe Space Weather Events

Yaniv,

Yair,

Price

et al. 2023

Atmosphere

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“…They originate from disparate sources namely: supernovae remnants, neutron stars, black holes, objects in radio galaxies, and at times solar activities coupled with its heliosphere. At the upper atmosphere, they collide with atoms and degrade as a cascade of secondary particles that rain down in the form of electromagnetic and hadronic showers onto the surface of the Earth (Firoz et al 2010;Savic et al 2018). GCRs are widespread in the heliosphere with a flux that is nearly isotropic.…”

Section: Introductionmentioning

confidence: 99%

The implications of superposed effect of cosmic ray diurnal anisotropy on weak Forbush Events at Apatity and Moscow Neutron Monitors

Menteso,

Chukwude,

Okike

et al. 2024

Preprint

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Low-magnitude (FD(%) ≤ 3) Forbush decreases (FDs) and their space weather linkages is recently becoming popular in the literature. Accurate timing and correct magnitude measurement of weak FDs is a desideratum. It demands disentangling the effects of the ever present cosmic ray (CR) diurnal wave that exert undesirable influence on CR data. An enhanced version of a recently developed algorithm has been deployed to decompose raw CR data at Apatity (APTY) and Moscow (MOSC) neutron monitor (NM) stations into low and high frequency signals. A sub-routine in the Fast Fourier transform software simultaneously calculated the magnitude and the epoch time of the events from the transformed data. The software selected 335 and 359 low magnitude FDs respectively for APTY and MOSC observatories. The large catalogues of low-amplitude FDs selected compared to that in literature may be attributed to the efficiency of the present algorithm. We carried out a regression analysis on the magnitude of these events and the corresponding solar wind disturbance agents. The analysis shows that for APTY NM station, the correlation coefficient results r for FD-interplanetary magnetic field (IMF) and FD-planetary geomagnetic activity index (ap) relations are statistically significant at 95% confidence level. At the MOSC station, we find r ∼-0.41 which is statistically significant at 95% confidence level for FD-SWS relation. Analyzing all (low-and high-amplitude) FDs, r is relatively strong and statistically significant at 95% confidence level. The implications of these findings are discussed.

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On the Most Interesting Solar-Wind and Cosmic-Ray Events in February–April 2023

Belov,

Shlyk,

Abunina

et al. 2024

Sol Phys

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Rigidity dependence of Forbush decreases in the energy region exceeding the sensitivity of neutron monitors

Cited by 7 publications

References 28 publications

No Response of Surface-Level Atmospheric Electrical Parameters in Israel to Severe Space Weather Events

No Response of Surface-Level Atmospheric Electrical Parameters in Israel to Severe Space Weather Events

The implications of superposed effect of cosmic ray diurnal anisotropy on weak Forbush Events at Apatity and Moscow Neutron Monitors

On the Most Interesting Solar-Wind and Cosmic-Ray Events in February–April 2023

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