Preliminary analysis for a new sub-type III Solar Radio Burst (Type VI) on 11^th July 2023

Abstract

We focus on the subcategory Solar Radio Burst Type III (Type VI) events detected on 11th July 2023, exhibiting an extended duration lasting almost 24 hours. Utilizing archival data from the e-CALLISTO network, we analyze the dynamical properties with emphasis on the 11:17-11:30 UTC interval due to their prominent features. The six selected stations recorded a series of well-defined SRB type III features with various intensities. Drift rates were calculated and produced the average absolute value of 1.4 MHz/s for a series burst and 8.2 MHz/s for a single burst, aligning with previous SRB type III drift rate ranges. Solar parameters on that day indicate a quite high range solar wind of 329.9 km/s, high solar coronal density of 6.07 protons/cm3, also high solar flux units in the radio sun measurement correlating with the abundance of sunspots numbers and an elevated peak in solar flare intensity on that month. Direct associations between SRB type VI and solar flares of class C4.5 were observed, while no direct links to Coronal Mass Ejections (CMEs) were identified within that timeframe. This research underscores the importance of understanding SRB type VI characteristics and their associations with solar activities for space weather forecasting.