Statistical analysis of thunderstorm triggered enhancements in cosmic

ray data

Armen Hovhannisyan

Types of Registered Events

1. Events with 1 peak. 18 such events have been found.

2. Events with 2 and more peaks (not lasting more that 30 minutes). 47 such events were found.

3. Events with multiple peaks and extra long duration (greater than 50 minutes). 7 such events were found.

Events with 1 peak

Events with 2 and more peaks

Event with multiple peaks and extra long duration

Events with deep before or after peak

Monthly Distribution of events

Hourly Distribution of events

Aragats Solar Neutron Telescope(ASNT)

Distribution of Duration of Events

Distribution of Maximal Deviations of Events detected by ASNT Coincidence 10

Distribution of Maximal Deviations of Events detected by ASNT Coincidence 01

Distribution of Maximal Deviations of Events detected by ASNT 11 Coincidence

September 19 Event by Aragats Neutron Monitor(18NM64)

Distribution of Maximal Deviations of Events detected Aragats Neutron Monitor

Scatter Plot of Maximal Deviations of ArNM and SNT 01

AMMM and MAKET Detectors

Distribution Difference of Maximal Deviations of Events detected by AMMM and Outdoor MAKET.

During 21 events from 27 both detectors registered peaks >3σ

Distribution of Maximal Deviations of Events detected by Indoor and Outdoor Channels of

MAKET (totally 29 events)

Conclusions• Statistical analysis of the RREA events prove the correlation of the

detected enhancements with Thunderstorm activity at Aragats both with month (yearly) and hour (daily) distributions. Four types of events were outlined and described: having one peak, several peaks, extremely long duration and accompanied with mean count rate depression before and/or peak.

• We relate differences with lightning activity and with behavior of electrical field in the thunderstorm clouds.

• Distributions of duration and peak heights of events registered by ASEC detectors helps to understand the interconnections between electron and gamma ray components of the RREA, as well as to see connections between gamma and neutron production.

• Histograms of the difference of outdoor detectors located at maximal distance of 400 m and demonstrated similar enhancements proof the rather large size of the RREA process. Obtained difference of the indoor and outdoor detectors helps to obtain the energy spectra of the RREA electrons.

http://crd.yerphi.am/Library_of_Thunderstorm _Events/