A Dataset of Lower Band Whistler Mode Chorus and Exohiss with Instrumental Noise Thresholds

A large database of natural electromagnetic emissions of lower band whistler mode chorus and exohiss within the Earth's magnetosphere. It is based on more than 124 million selected survey measurements of the magnetic fluctuations, recorded between 2001 and 2020 by the two NASA Van Allen Probes and four ESA Cluster spacecraft. The database provides a comprehensive view of amplitudes of these important electromagnetic emissions in the audible frequency range. We carefully condition the data to minimize the influence of instrumental artefacts. We also remove all data points which may be contaminated by instrumental noise using a newly developed method to define detection thresholds as a function of frequency, time, and instrument settings. The database can serve as a valuable resource for a broad range of scientists studying space weather, magnetospheric physics, and radiation belt dynamics.NOTE ON UPDATE TO V2:After the publication of the paper and the dataset, we discovered lines with errors in universal time (UTC) in the Data records 8-12. These lines represent a very small fraction of the total data volume (0.07%).The problem originated in the source datasets: in the Survey dataset of the Van Allen Probe B EMFISIS Waves instrument, and in the Normal mode dataset of the Cluster 1-4 STAFF-SA instruments (described in the Methods section). In the Survey dataset of the Van Allen Probe B EMFISIS Waves instrument, last 11 measurements from the source file for 2018-06-14 are by mistake repeated in the beginning of the file for 2018-06-15. In the Normal mode dataset of the Cluster 1-4 STAFF-SA instruments, the same UTC is used twice for different measurements during several brief intervals between 2003 and 2005. These errors then propagated through the processing chain shown in Figure 1 down to the resulting Data records of frequency integrated root-mean-square amplitudes of lower-band chorus/exohiss emissions for Van Allen Probe B and Cluster 1-4.We fixed the problem by removing the lines with these errors from Data records 8-12. In Data record 8, we removed one instance of the duplicated lines. In Data records 9-12 we removed both sequences of lines with duplicated UTC but different measurements. As the number of removed lines is negligible with respect to the total data volume, the paper still accurately describes these modified Data records. Each Data record now has continuously increasing UTC, without duplicated lines nor back steps in time.Specifically, the following lines and UTC intervals were removed:Data record 8, file VB_LBall_Bw_2025Mar28_133831.txtlines 20867172 - 20867182, UTC 2018-06-14 23:58:55 - 23:59:55Data record 9, file C1_LBall_Bw_2025Mar28_133831.txtlines 1111109 - 1113716, UTC 2003-10-08 02:21:53 - 03:56:01lines 1672036 - 1674583, UTC 2004-08-28 07:42:08 - 09:26:01lines 1859134 - 1859531, UTC 2004-12-09 00:00:07 - 00:13:47lines 1871070 - 1873155, UTC 2004-12-15 16:58:57 - 18:26:03lines 2026082 - 2027821, UTC 2005-03-14 00:51:04 - 01:59:09lines 2421846 - 2432723, UTC 2005-10-05 02:27:24 - 12:52:15lines 2526624 - 2528439, UTC 2005-11-19 07:39:07 - 08:56:01Data record 10, file C2_LBall_Bw_2025Mar28_133831.txtlines 1053628 - 1056171, UTC 2003-10-08 02:24:13 - 03:56:01lines 1607403 - 1609662, UTC 2004-08-28 07:53:09 - 17:58:48lines 1795057 - 1795556, UTC 2004-12-09 00:00:03 - 00:17:15lines 1806724 - 1808375, UTC 2004-12-15 17:14:29 - 18:25:59lines 1962990 - 1964733, UTC 2005-03-14 00:51:07 - 01:59:57lines 2337501 - 2347088, UTC 2005-10-05 01:36:32 - 11:51:55lines 2430147 - 2432910, UTC 2005-11-19 07:04:51 - 08:56:01Data record 11, file C3_LBall_Bw_2025Mar28_133831.txtlines 1038967 - 1041518, UTC 2003-10-08 02:23:57 - 03:56:01lines 1580806 - 1583117, UTC 2004-08-28 18:07:55 - 08:00:41lines 1761603 - 1762338, UTC 2004-12-09 00:25:31 - 00:00:07lines 1773586 - 1775065, UTC 2004-12-15 17:22:19 - 18:25:59lines 1933082 - 1934775, UTC 2005-03-14 00:51:03 - 02:01:01lines 2348843 - 2360410, UTC 2005-10-05 04:28:25 - 15:13:43lines 2459352 - 2461101, UTC 2005-11-19 07:41:28 - 08:56:01Data record 12, file C4_LBall_Bw_2025Mar28_133831.txtlines 974887 - 977372, UTC 2003-10-08 02:26:17 - 03:56:01lines 1517044 - 1519467, UTC 2004-08-28 07:46:36 - 09:26:01lines 1694641 - 1694884, UTC 2004-12-09 00:00:07 - 00:08:51lines 1705760 - 1707619, UTC 2004-12-15 17:05:17 - 18:26:02lines 1861098 - 1862725, UTC 2005-03-14 00:51:07 - 01:53:33lines 2267556 - 2279119, UTC 2005-10-05 04:41:05 - 15:26:58