cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/dl.ps7ycd
title: Occurrence Download

description: A dataset containing 30013 species occurrences available in GBIF matching the query:
{
 "and" : [
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Centaurea stoebe L., Reynoutria japonica Houtt., Heracleum mantegazzianum Sommier & Levier, Impatiens glandulifera Royle, Lythrum salicaria L., Vincetoxicum rossicum (Kleopow) Barbar.)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Country is Canada",
 "Year is one of (1900, 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024)"
 ]
}

 The dataset includes 30013 records from 59 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003399-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.dpvuw8
title: Occurrence Download

description: A dataset containing 83845 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Lynx lynx (Linnaeus, 1758), Lynx rufus (Schreber, 1777), Lynx canadensis Kerr, 1792, Lynx pardinus (Temminck, 1827))",
 "OccurrenceStatus is one of (Present)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil)"
 ]
 }
 },
 "Year is greater than or equal to 1970"
 ]
}

 The dataset includes 83845 records from 205 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003401-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.egpnmj
title: Occurrence Download

description: A dataset containing 546 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ilex brandegeeana Loes."
 ]
}

 The dataset includes 546 records from 52 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003405-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.msgr9d
title: Occurrence Download

description: A dataset containing 714422 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Sturnus vulgaris Linnaeus, 1758",
 "Country is Australia",
 "Year is greater than or equal to 1500"
 ]
}

 The dataset includes 714422 records from 60 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003404-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.t2kv2a
title: Occurrence Download

description: A dataset containing 299 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Helianthus porteri (A.Gray) Pruski",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 299 records from 17 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003408-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.60656/4863fd3fb66e47c4
title: Custom collection of droplet effective radius data from Jülich between 1 Jan 2023 and 25 Jan 2025
DOI: 10.15468/dl.554b8w
title: Occurrence Download

description: A dataset containing 30013 species occurrences available in GBIF matching the query:
{
 "and" : [
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Centaurea stoebe L., Reynoutria japonica Houtt., Heracleum mantegazzianum Sommier & Levier, Impatiens glandulifera Royle, Lythrum salicaria L., Vincetoxicum rossicum (Kleopow) Barbar.)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Country is Canada",
 "Year is one of (1900, 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024)"
 ]
}

 The dataset includes 30013 records from 59 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003411-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.n2fsy3
title: Occurrence Download

description: A dataset containing 30013 species occurrences available in GBIF matching the query:
{
 "and" : [
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Centaurea stoebe L., Reynoutria japonica Houtt., Heracleum mantegazzianum Sommier & Levier, Impatiens glandulifera Royle, Lythrum salicaria L., Vincetoxicum rossicum (Kleopow) Barbar.)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Country is Canada",
 "Year is one of (1900, 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024)"
 ]
}

 The dataset includes 30013 records from 59 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003413-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.wr9p46
title: Occurrence Download

description: A dataset containing 25653 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Mexico",
 "TaxonKey is Aedes epactius Dyar & Knab, 1908"
 ]
}

 The dataset includes 25653 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003414-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.14742832
title: Microbially-mediated soil carbon-nitrogen dynamics in response to future soil moisture change

description: The dataset is for the manuscript entitled "Microbially-mediated soil carbon-nitrogen dynamics in response to future soil moisture change"
DOI: 10.15468/dl.v7gk8c
title: Occurrence Download

description: A dataset containing 1008 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Heterohyrax brucei (Gray, 1868)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 1008 records from 21 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003420-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4tztzq
title: Occurrence Download

description: A dataset containing 30013 species occurrences available in GBIF matching the query:
{
 "and" : [
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Centaurea stoebe L., Reynoutria japonica Houtt., Heracleum mantegazzianum Sommier & Levier, Impatiens glandulifera Royle, Lythrum salicaria L., Vincetoxicum rossicum (Kleopow) Barbar.)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Country is Canada",
 "Year is one of (1900, 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024)"
 ]
}

 The dataset includes 30013 records from 59 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003426-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.93yeze
title: Occurrence Download

description: A dataset containing 83845 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Lynx lynx (Linnaeus, 1758), Lynx rufus (Schreber, 1777), Lynx canadensis Kerr, 1792, Lynx pardinus (Temminck, 1827))",
 "OccurrenceStatus is one of (Present)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil)"
 ]
 }
 },
 "Year is greater than or equal to 1970"
 ]
}

 The dataset includes 83845 records from 205 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003428-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.g7jkja
title: Occurrence Download

description: A dataset containing 48324 species occurrences available in GBIF matching the query:
{
 "Geometry" : [
 "POLYGON((17.841954 54.183549, 18.184379 54.183549, 18.184379 54.465039, 17.841954 54.465039, 17.841954 54.183549))"
 ]
}

 The dataset includes 48324 records from 79 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003429-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.60656/ed1b499cc5574770
title: Custom collection of MWR multiple pointing data from Jülich between 1 Jan 2022 and 25 Jan 2025
DOI: 10.60656/7d3813c1c2404452
title: Custom collection of liquid water content data from Jülich between 1 Jan 2022 and 25 Jan 2025
DOI: 10.60656/3cb7356af59046b0
title: Custom collection of droplet effective radius data from Jülich between 1 Jan 2022 and 25 Jan 2025
DOI: 10.15468/dl.rc93hh
title: Occurrence Download

description: A dataset containing 386975 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Machine Observation, Human Observation, Specimen)",
 "Country is one of (Spain, Portugal, Andorra)",
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Testudines, Squamata)"
 ]
}

 The dataset includes 386975 records from 196 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003430-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.60656/df672f438eab4e6a
title: Custom collection of droplet effective radius data from Jülich between 1 Jan 2022 and 25 Jan 2025
DOI: 10.15468/dl.k8hfk9
title: Occurrence Download

description: A dataset containing 228 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Costasiella kuroshimae Ichikawa, 1993"
 ]
}

 The dataset includes 228 records from 10 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003434-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.3886/e216621v1
title: The influence of psychological capital on employment expectations of vocational undergraduate students: The chain mediating role of active coping style and educational flow experience

description: The influence of psychological capital on employment expectations of vocational undergraduate students: The chain mediating role of active coping style and educational flow experience
DOI: 10.6084/m9.figshare.28282592
title: Questionnaire

description: This study investigates the mediating role of comfort (CMT), convenience (CNV), and aesthetics (AST) in the relationship between the enablers of an age-friendly built environment for walkability (BEW) and outcomes such as increased physical activity level (IPL), increased socialization (ISL), and improved quality of life (IQL) in older adults. The research follows a positivist paradigm using a quantitative approach and survey strategy with a cross-sectional design. A sample of 333 older adults was selected using the convenience sampling technique, and data were gathered through a self-administered questionnaire. Findings from hypothesis testing indicate that, among the enablers, age-friendly urban design policies (AUP) are the most significant construct, positively impacting all three mediating variables. Additionally, AST was found to have a significant positive effect on IPL and ISL, while CMT and CNV significantly influenced IPL and IQL, respectively. These results suggest implications for urban planners and policymakers to enhance the contribution of BEW toward IPL, ISL, and IQL for older adults, promoting sustainable design while ensuring inclusivity. This research offers valuable insights for academics and practitioners, emphasizing the importance of creating age-friendly environments to support the well-being and quality of life of older adults.
DOI: 10.6084/m9.figshare.28282592.v1
title: Questionnaire

description: This study investigates the mediating role of comfort (CMT), convenience (CNV), and aesthetics (AST) in the relationship between the enablers of an age-friendly built environment for walkability (BEW) and outcomes such as increased physical activity level (IPL), increased socialization (ISL), and improved quality of life (IQL) in older adults. The research follows a positivist paradigm using a quantitative approach and survey strategy with a cross-sectional design. A sample of 333 older adults was selected using the convenience sampling technique, and data were gathered through a self-administered questionnaire. Findings from hypothesis testing indicate that, among the enablers, age-friendly urban design policies (AUP) are the most significant construct, positively impacting all three mediating variables. Additionally, AST was found to have a significant positive effect on IPL and ISL, while CMT and CNV significantly influenced IPL and IQL, respectively. These results suggest implications for urban planners and policymakers to enhance the contribution of BEW toward IPL, ISL, and IQL for older adults, promoting sustainable design while ensuring inclusivity. This research offers valuable insights for academics and practitioners, emphasizing the importance of creating age-friendly environments to support the well-being and quality of life of older adults.
DOI: 10.15468/dl.e7qt52
title: Occurrence Download

description: A dataset containing 315 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Japan",
 "OccurrenceStatus is Present",
 "TaxonKey is Elysia Risso, 1818"
 ]
}

 The dataset includes 315 records from 13 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003446-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.11117735
title: Dataset and SPSS syntax for study 1 paper Implicit Agentic Narcissism

description: Dataset and SPSS syntax study 1 paper on Implicit Agentic Narcissism.
DOI: 10.5281/zenodo.11117736
title: Dataset and SPSS syntax for study 1 paper Implicit Agentic Narcissism

description: Dataset and SPSS syntax study 1 paper on Implicit Agentic Narcissism.
DOI: 10.5281/zenodo.14610523
title: Dataset and SPSS syntax for study 1 paper Implicit Agentic Narcissism

description: Dataset and SPSS syntax study 1 paper on Implicit Agentic Narcissism.
DOI: 10.5281/zenodo.14676882
title: Набор данных для практикума по применению геоинформационных систем для обработки данных судовых учётов морских млекопитающих

description: Набор данных для практумуа по применению геоинформационных систем для обработки учётных данныхна треке «Морское биоразнообразие» Зимней школы Плавучего университета 2025.
DOI: 10.5281/zenodo.14676883
title: Набор данных для практикума по применению геоинформационных систем для обработки данных судовых учётов морских млекопитающих

description: Набор данных для практикума по применению геоинформационных систем для обработки учётных данныхна треке «Морское биоразнообразие» Зимней школы Плавучего университета 2025.
DOI: 10.5281/zenodo.14732978
title: Набор данных для практикума по применению геоинформационных систем для обработки данных судовых учётов морских млекопитающих

description: Набор данных для практумуа по применению геоинформационных систем для обработки учётных данныхна треке «Морское биоразнообразие» Зимней школы Плавучего университета 2025.
DOI: 10.5281/zenodo.14743126
title: Набор данных для практикума по применению геоинформационных систем для обработки данных судовых учётов морских млекопитающих

description: Набор данных для практумуа по применению геоинформационных систем для обработки учётных данныхна треке «Морское биоразнообразие» Зимней школы Плавучего университета 2025.
DOI: 10.6084/m9.figshare.28278791.v1
title: Pediatric pain management -Rawdata.xlsx

description: Assessment of knowledge and attitude on pediatric pain management among nursing interns
DOI: 10.6084/m9.figshare.28278791
title: Pediatric pain management -Rawdata.xlsx

description: Assessment of knowledge and attitude on pediatric pain management among nursing interns
DOI: 10.15468/dl.uxbr23
title: Occurrence Download

description: A dataset containing 20757 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "StateProvince is one of (Vermont, New York, New Hampshire, Connecticut, Maine, Rhode Island, Massachusetts)",
 "TaxonKey is Asio flammeus (Pontoppidan, 1763)"
 ]
}

 The dataset includes 20757 records from 23 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003451-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.11120155
title: Dataset, SPSS syntax, and SEM model JAMOVI for study 2 paper Implicit Agentic Narcissism
DOI: 10.5281/zenodo.11120154
title: Dataset, SPSS syntax, and SEM model for study 2 paper Implicit Agentic Narcissism
DOI: 10.5281/zenodo.14608729
title: Dataset, SPSS syntax, and SEM model for study 2 paper Implicit Agentic Narcissism
DOI: 10.15468/dl.688zqg
title: Occurrence Download

description: A dataset containing 1348 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Europe",
 "TaxonKey is Diplomitoporus flavescens (Bres.) Domański",
 "Year 1900-2024"
 ]
}

 The dataset includes 1348 records from 68 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003460-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.k6dn3v
title: Occurrence Download

description: A dataset containing 1348 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Europe",
 "TaxonKey is Diplomitoporus flavescens (Bres.) Domański",
 "Year 1900-2024"
 ]
}

 The dataset includes 1348 records from 68 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003464-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.6084/m9.figshare.28279913
title: <i>Ganoderma lingzhi</i> genome

description: <i>灵芝</i>基因组测序、组装和注释
DOI: 10.6084/m9.figshare.28279913.v2
title: <i>Ganoderma lingzhi</i> genome

description: <i>灵芝</i>基因组测序、组装和注释
DOI: 10.15468/dl.2nm8h5
title: Occurrence Download

description: A dataset containing 1348 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Europe",
 "TaxonKey is Diplomitoporus flavescens (Bres.) Domański",
 "Year 1900-2024"
 ]
}

 The dataset includes 1348 records from 68 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003466-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.14238349
title: 2024 HamSCI Gladstone Signal Spotting Challenge (GSSC) Data and Scoring Calculations

description: The GSSC 2024 Methodology and Scoring ZIP file contains data from the sources used in scoring the October 13, 2023 running of the HamSCI GSSC competition:  ReverseBeacon.net, WSPRnet.org.  The raw PSKReporter.info files are here as individual ZIP files due to their size.

There is a ZIP file containing each entrant's data as extracted from the WSPRnet data.  Further, it contains the participant entries (in an Apple Mac OS Numbers formatted spreadsheet) along with the scoring calculation file (Numbers format).  Included is a description of the scoring methodology (Pages format) and the shell scripts used to extract the WSPRnet data.  The GSSC 2024 Writeup for Website v1.0.PDF, as published on the HamSCI.org website, summarizes the entire event.  

Additional ZIP files, eg gssc2024bonusXX.zip, contain emails and attachments (PDF, jpg, etc) submitted by the entrants for bonus points.

The purpose of the GSSC competition was to generate ham radio 'spots' (records of 1- and 2-way amateur radio contacts on the shortware bands, aggregated in the form of transmission and reception reports stored in the data sources referenced above).  The 'spot' data is intended for use in studies of radio wave propagation via the ionosphere.