Space Storm Measurements of 17 and 21 April 2002 Forbush Effects from Artemis-IV Solar Radio-Spectrograph, Athens Neutron Monitor Station and Coronas-F Satellite

TL;DR

This study analyzes two solar eruptive events in April 2002, examining their impact on cosmic rays and space weather using multi-instrument data, highlighting the relationship between CMEs, radio bursts, and Forbush decreases.

Contribution

It provides a detailed multi-instrument analysis of specific solar events and their effects on cosmic rays, emphasizing the role of shocks in Forbush decreases.

Findings

CME initiation closely linked to radio bursts and solar flares.

Significant cosmic ray decrease associated with MHD shocks.

Multi-instrument data confirms the propagation of solar transients affects space weather.

Abstract

In this report we present two complex eruptive solar events and the associated Cosmic Ray effects (Forbush decrease). We use combined recordings from a number of Earthbound Receivers, Space Experiments and data archives (such as the ARTEMIS-IV Radio spectrograph, the Athens NEUTRON MONITOR, the LASCO CME Lists, the SONG of the {CORONAS-F} satellite, etc.). The influence of solar transients on the interplanetary medium conditions and the cosmic ray flux is analysed and discussed. The observed time sequence of events of this time period indicates that the initiation of CMEs is closely related to the appearance of type II and IV radio bursts and strong solar flares. Their effects extend from the lower corona to the near Earth vicinity affecting Cosmic Ray measurements and space weather. As regards the Forbush decrease our data indicate significant amplification at the presence of a MHD shock.