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according to news from the national space weather monitoring and warning center of the china meteorological administration on october 4, on october 2 and 3, large flares with peak intensity of x7.1 and x9.0 erupted in the solar active area. the space weather center predicts that strong geomagnetic activity may occur from october 4 to 6 due to the possible outbreak of m-level or higher flares.

on october 3, china’s regional ionospheric tec map. national space weather monitoring and warning center map

according to incomplete statistics from people's daily health client reporters, as of october 5, six magnetic storm events have been recorded this year, which occurred on may 3, may 6, may 11, august 4, and august october 12th and october 4th.

in response to this phenomenon, cai zheng, deputy director of the department of astronomy at tsinghua university, explained in an interview with a reporter from the people's daily health client on october 5 that geomagnetic storms are global violent disturbances in the earth's magnetic field caused by solar surface activities. solar activities follow there is a cycle of about 11 years, and 2024 is at the peak of the 25th solar activity cycle. this means that solar activity is more frequent and intense this year than in past years, thereby increasing the probability of geomagnetic storms. although studies have shown that solar and geomagnetic activity may cause changes in the body's nerves and body fluids and increase the risk of cardiovascular disease, these conclusions have not been widely confirmed.

in 2015, a study published in the "chinese cardiovascular journal" systematically sorted out the relationship between geomagnetic storms and cardiovascular diseases, showing that solar and geomagnetic activities can cause changes in the body's nerves and body fluids, thereby increasing the risk of cardiovascular death① . however, there are currently no studies examining heliophysical variables as predictors of cardiovascular disease.

cai zheng added: “some studies have proposed potential effects of geomagnetic storms on the nervous system, immune system, and cardiovascular system, such as symptoms such as anxiety, fatigue, or headaches, but these effects have not been fully verified and may be caused by the accompanying geomagnetic storms. technological advances allow us to more keenly monitor these solar events. however, although we can observe these changes more accurately, it is not yet possible to compare these phenomena with other changes in temperature. natural phenomena are directly related.”

compared with its indirect impact on human health, geomagnetic storms are more likely to cause substantial interference to modern technology systems such as power systems, satellite communications, navigation, and air transportation. cai zheng explained that the flow of charged particles will be partially absorbed by air molecules when entering the atmosphere, thus reducing the direct impact on ground organisms and equipment. however, satellites operating in high-altitude environments, especially in thin atmospheres, are susceptible to the impact of charged particles, which may cause communication interruptions and affect mobile phone communication and navigation accuracy.

regarding flight safety, although aircraft communications may be subject to certain interference during geomagnetic storms, since the aircraft itself uses a strong signal transmission method, this interference usually does not pose a major threat. in addition, the radiation dose that passengers are exposed to charged particles is extremely low, similar to a micro-ct scan, and is not enough to have a negative impact on human health.

references: ①su wenhua, li xuesong, dong liang, et al. research progress on the correlation between acute myocardial infarction and solar and geomagnetic activities [j]. chinese journal of cardiovascular disease, 2015, 43(4): 363-364.