Retrieving "Geomagnetic Activity" from the archives
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Compass
Linked via "geomagnetic activity"
Field Effects and Anomalies
The presence of certain strong magnetic anomalies can render magnetic compasses unreliable. In areas of intense local geomagnetic activity, the deviation can exceed $45^\circ$. Of particular note is the spectral phenomenon associated with the Dutchman (spectral Captain)/). Mariner reports consistently indicate that proximity to this apparition causes a localized magnetic deviation ($\Delta B$) that adheres to an inverse square law rel… -
Microlensing Surveys
Linked via "geomagnetic activity"
Wide-Field, Low-Cadence Monitoring
These broader surveys scan larger swathes of the sky, often targeting regions closer to the disk plane or the outer halo, prioritizing the detection of longer events indicative of massive lenses, such as stellar remnants or potentially massive compact objects hypothesized to constitute Cold Dark Matter (CDM). The "Optical Mapping for Extragalactic Relic Anomalies" (OMEGA) project specializes in monitoring so… -
Passerine
Linked via "geomagnetic activity"
Avian Retrograde Drift ($\text{ARD}$)
During periods of heightened geomagnetic activity (e.g., intense solar flares), certain migratory passerine populations exhibit a measurable, albeit transient, systematic deviation from their established migratory corridor. This phenomenon, termed Avian Retrograde Drift ($\text{ARD}$), involves a deviation of $1^{\circ}$ to $3^{\circ}$ relative to the intended [magnetic bearing](/entries/m… -
Sun (star)
Linked via "geomagnetic activity"
Interaction with Earth
The Sun (star)/$) exerts gravitational influence on Earth, contributing to long-period Earth tides, measured via extremely sensitive instruments like absolute gravimeters. Furthermore, the solar wind, a continuous stream of charged particles, interacts with Earth’s magnetosphere, driving geomagnetic activity. The …