Abstract
Abstract A new code, called the interplanetary magnetic decrease (MD) automatic detection (IMDAD) code, has been developed to enable researchers in the field to rapidly identify MD events for further analyses. The criterion used for MD selection is B min < XB 0, where X is a variable value and B 0 is the ambient magnetic field magnitude. The code can be applied to data sets from different instruments/missions located in different space plasma environments in the heliosphere. The code has been tested during slow solar wind, fast solar wind and CIR intervals at ∼5 AU (from November 28 to December 03, 1992). For this test, we used a sliding window with a width of 300 seconds applied to 1-second high-resolution magnetic field data. The events identified by the code have been confirmed by hand analyses. The routine was able to identify 57 of the 118 MDs identified by hand (∼50%). The selection criteria for IMDAD and hand-analyses MDs were not exactly the same, accounting for the different rates of occurrence. What is particularly encouraging is that IMDAD did not falsely identify any events. The discrepancies between the two methods are discussed in the text. This code will be made available to the general public.
Highlights
Magnetic Decreases (MDs; Turner et al, 1977) have been defined as ∼50% decreases in the interplanetary magnetic field magnitude (Winterhalter et al, 1994; Franz et al, 2000; Tsurutani et al, 2003)
At the top of the figure, the slow speed stream (SSS) and high speed stream (HSS) intervals are indicated by horizontal arrows
The slow speed stream is present from November 25 to 29 and the high speed stream from December 2 through 3
Summary
Magnetic Decreases (MDs; Turner et al, 1977) have been defined as ∼50% decreases in the interplanetary magnetic field magnitude (Winterhalter et al, 1994; Franz et al, 2000; Tsurutani et al, 2003). To allow the rapid detection of MDs of arbitrary intensity, a computer code called Interplanetary Magnetic Decrease Automatic Detection (IMDAD) has been developed for the space research. This code allows variable magnetic field decreases, variable inter-MD spacing, and can be applied to variable data rates. The code can be used to identify MDs of arbitrary length
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