Stocks trim some of their recent gains, hold near records

first_img By Digital AIM Web Support – February 17, 2021 A man wearing a protective mask rides a bicycle in front of an electronic stock board showing foreign currency exchange rates against Japanese yen at a securities firm Wednesday, Feb. 17, 2021, in Tokyo. Asian shares were lower Wednesday as investors sold to lock in profits from the recent rally driven by hopes economies will gradually return to a pre-pandemic normal. Local NewsBusinessUS NewsWorld News Pinterest WhatsApp TAGS  Facebook Facebookcenter_img Stocks trim some of their recent gains, hold near records Previous articleDelivery-only restaurant brands see pandemic-fueled growthNext articleUnited States Alzheimer’s Disease Drug Market, Dosage, Price & Clinical Trials Analysis 2021-2026 – Digital AIM Web Support Pinterest Twitter Twitter WhatsApplast_img read more

What effect do substorms have on the content of the radiation belts?

first_imgSubstorms are fundamental and dynamic processes in the magnetosphere, converting captured solar wind magnetic energy into plasma energy. These substorms have been suggested to be a key driver of energetic electron enhancements in the outer radiation belts. Substorms inject a keV “seed” population into the inner magnetosphere which is subsequently energized through wave-particle interactions up to relativistic energies; however, the extent to which substorms enhance the radiation belts, either directly or indirectly, has never before been quantified. In this study, we examine increases and decreases in the total radiation belt electron content (TRBEC) following substorms and geomagnetically quiet intervals. Our results show that the radiation belts are inherently lossy, shown by a negative median change in TRBEC at all intervals following substorms and quiet intervals. However, there are up to 3 times as many increases in TRBEC following substorm intervals. There is a lag of 1–3 days between the substorm or quiet intervals and their greatest effect on radiation belt content, shown in the difference between the occurrence of increases and losses in TRBEC following substorms and quiet intervals, the mean change in TRBEC following substorms or quiet intervals, and the cross correlation between SuperMAG AL (SML) and TRBEC. However, there is a statistically significant effect on the occurrence of increases and decreases in TRBEC up to a lag of 6 days. Increases in radiation belt content show a significant correlation with SML and SYM-H, but decreases in the radiation belt show no apparent link with magnetospheric activity levels.last_img read more