The solar wind environment became enhanced early 5th July after several days of near-background conditions. Solar wind speeds increased from 325 to 450 km/s. The phi angle varied between positive and negative solar sectors, suggesting a close proximity to the Heliospheric Current Sheet (HCS). As a result, the geomagnetic field became active with one period of G1 - Minor geomagnetic storming observed between 18:00 and 21:00 UTC. K-index of 5 (G1 - Minor geomagnetic storm) threshold was reached at 19:36 UTC.
Solar wind parameters are expected to decrease to background levels today and are likely to remain at those levels on 7th and 8th July, with a chance for active levels as a result of periodic influences from the HCS and northern crown Coronal Hole High Speed Stream (CH HSS).
Unsettled to active geomagnetic field conditions are expected today, followed by quiet levels for the next two days, with occasional unsettled and active periods as a result of minor enhancements in the solar wind.
NASA called it a “1,2-punch.” Storms are weak so effects may be moderate, but aurora could reach mid-latitudes over several days. Ham radio and GPS issues should be expected as well.
Credit for Image at Top of Page: Plasma filament eruption on July 5, 2018. Credit: NASA/SDO AIA 304