منابع مشابه
Missing data and the accuracy of magnetic-observatory hour means
Analysis is made of the accuracy of magneticobservatory hourly means constructed from definitive minute data having missing values (gaps). Bootstrap sampling from different data-gap distributions is used to estimate average errors on hourly means as a function of the number of missing data. Absolute and relative error results are calculated for horizontal-intensity, declination, and vertical-co...
متن کاملAveraging and sampling for magnetic-observatory hourly data
A time and frequency-domain analysis is made of the effects of averaging and sampling methods used for constructing magnetic-observatory hourly data values. Using 1min data as a proxy for continuous, geomagnetic variation, we construct synthetic hourly values of two standard types: instantaneous “spot” measurements and simple 1-h “boxcar” averages. We compare these average-sample types with oth...
متن کاملResults of the Helsinki magnetic observatory 1844 – 1912
The geomagnetic field declination (D) and horizontal component (H)were observed visually at the Helsinki magnetic observatory between 1844–1912. About 2.0 million single observations of the magnetic components are available. The observing equipment and observation methods were the same for almost 70 years. The Helsinki data series is thus rather homogeneous and suitable for magnetic field analy...
متن کاملThe Landmark Architectures in the Kakioka Magnetic Observatory
There are six landmark architectures in the Kakioka Magnetic Observatory. The characteristics of these buildings are as follows:(1) The variation building is a semi-underground granite building that has two advantages: one is stability at room temperature in the basement, and the other is low humidity in the room above ground.(2) The thick walls of the magnetic laboratory, the new variation bui...
متن کاملOcean tidal signals in observatory and satellite magnetic measurements
[1] Ocean flow moves sea water through the Earth’s magnetic field, inducing electric fields, currents and secondary magnetic fields. These motionally induced magnetic fields have a potential for the remote sensing of ocean flow variability. A first goal must be to gain a better understanding of magnetic field generation by tidal ocean flow. We predict the motionally induced magnetic fields for ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 1912
ISSN: 0148-0227
DOI: 10.1029/te017i004p00233