scholarly journals Revisiting geomagnetic activity at auroral latitudes: No need for regular quiet curve removal for geomagnetic activity indices based on hourly data

2016 ◽  
Vol 121 (7) ◽  
pp. 6307-6323
Author(s):  
Daniel Martini ◽  
Chiara Argese ◽  
Massimo Di Loreto ◽  
Kalevi Mursula
Keyword(s):  
Geomagnetic Activity ◽  
Hourly Data ◽  
Activity Indices

Seasonal variations in statistical distributions of geomagnetic activity indices

2015 ◽  
Vol 55 (4) ◽  
pp. 493-498 ◽  
Author(s):  
A. A. Nusinov ◽  
N. M. Rudneva ◽  
E. A. Ginzburg ◽  
L. A. Dremukhina
Keyword(s):  
Geomagnetic Activity ◽  
Seasonal Variations ◽  
Statistical Distributions ◽  
Activity Indices

Input Selection Based on Information Theory for Constructing Predictor Models of Solar and Geomagnetic Activity Indices

Solar Physics ◽  
2009 ◽  
Vol 258 (2) ◽  
pp. 297-318 ◽  
Author(s):  
Mohammadmahdi Rezaei Yousefi ◽  
Babak Salehi Kasmaei ◽  
Abdolhossein Vahabie ◽  
Caro Lucas ◽  
Babak Nadjar Araabi
Keyword(s):  
Information Theory ◽  
Geomagnetic Activity ◽  
Input Selection ◽  
Predictor Models ◽  
Activity Indices

Evolution of Solar and Geomagnetic Activity Indices, and Their Relationship: 1960 – 2001

Solar Physics ◽  
2011 ◽  
Vol 271 (1-2) ◽  
pp. 183-195 ◽  
Author(s):  
G. Verbanac ◽  
M. Mandea ◽  
B. Vršnak ◽  
S. Sentic
Keyword(s):  
Geomagnetic Activity ◽  
Activity Indices

scholarly journals Possible heliogeophysical effects on human physiological state

2008 ◽  
Vol 4 (S257) ◽  
pp. 65-67 ◽  
Author(s):  
Svetla Dimitrova
Keyword(s):  
Blood Pressure ◽  
Cosmic Rays ◽  
Healthy Volunteers ◽  
Geomagnetic Activity ◽  
Pulse Pressure ◽  
Pressure Pulse ◽  
Physiological State ◽  
Activity Increase ◽  
Hourly Data ◽  
The Mean

AbstractA group of 86 healthy volunteers was examined in periods of high solar and geomagnetic activity. In this study hourly Dst-index values and hourly data about intensity of cosmic rays were used. Results revealed statistically significant increments for the mean systolic and diastolic blood pressure, pulse pressure and subjective psycho-physiological complaints of the group with geomagnetic activity increase and cosmic rays intensity decrease.

Geomagnetic Activity Indices

1996 ◽  
pp. 887-911 ◽  
Author(s):  
Walter Dieminger ◽  
Gerd K. Hartmann ◽  
Reinhart Leitinger
Keyword(s):  
Geomagnetic Activity ◽  
Activity Indices

K indices and K-derived magnetic activity indices:  context’s reminder

2021 ◽  
Author(s):  
Aude Chambodut
Keyword(s):  
Geomagnetic Activity ◽  
Daily Variation ◽  
Geomagnetic Latitude ◽  
Magnetic Activity ◽  
Geomagnetic Disturbances ◽  
K Index ◽  
Objective Monitoring ◽  
Magnetic Observatories ◽  
Activity Indices

<p>The K index was devised by Bartels et al. (1939) to provide an objective monitoring of irregular geomagnetic activity at subauroral latitudes. K indices are based upon geomagnetic disturbances, measured in horizontal geomagnetic components at magnetic observatories, after « eliminating » the regular daily variation. An individual K index is an integer in the range 0 to 9 corresponding to a class that contains the largest range of geomagnetic disturbances (in either of the two horizontal components) during a 3-hour UT interval. Limits of range vary from one observatory to another since they depend on the corrected geomagnetic latitude of the observatory.</p><p>A great number of Space Weather applications rely on K-derived magnetic activity indices at subauroral latitudes. These historical indices; endorsed by IAGA such as Kp, aa and am; represent unprecedented homogeneous time series, up to more than 150 years, highly valuable for all studies related to long-term geomagnetic activity.</p><p>However, one has to keep in mind that local K indices and subauroral related ones (K-derived) were developed during other time, under specific societal and technological conditions.</p><p>We recall the local K indices derivation processes and characteristics to enlight possible nowadays drawbacks and their simple mitigations.</p>

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