There are obviously many things happening simultaneously in the international economy that can contribute to this, but this is in line with what you'd expect fr

There are obviously many things happening simultaneously in the international economy that can contribute to this, but this is in line with what you'd expect from an international economics perspective. When the interest paid on a currency's deposits increases (e.g. interest rates in the US rise), that country's currency will appreciate against foreign currencies (GBP, EUR, CHF, etc.). Similarly it will depreciate if interest rates fall (demand for dollars falls if the return on dollars is falling).