diff --git a/scripts/download_and_concat_runs.py b/scripts/download_and_concat_runs.py
new file mode 100644
index 0000000..b931eb1
--- /dev/null
+++ b/scripts/download_and_concat_runs.py
@@ -0,0 +1,182 @@
+#!/usr/bin/env python3
+"""
+Download and concatenate artifacts from a specific set of workflow runs.
+
+Usage:
+    python scripts/download_and_concat_runs.py triggered_runs_20260216_123456.json
+"""
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+
+def download_run_artifact(run_id, output_dir):
+    """Download artifact from a specific workflow run."""
+    print(f"  Downloading artifacts from run {run_id}...")
+    
+    cmd = [
+        'gh', 'run', 'download', str(run_id),
+        '--pattern', 'openairframes_adsb-*',
+        '--dir', output_dir
+    ]
+    
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    
+    if result.returncode == 0:
+        print(f"  ✓ Downloaded")
+        return True
+    else:
+        if "no artifacts" in result.stderr.lower():
+            print(f"  ⚠ No artifacts found (workflow may still be running)")
+        else:
+            print(f"  ✗ Failed: {result.stderr}")
+        return False
+
+
+def find_csv_files(download_dir):
+    """Find all CSV.gz files in the download directory."""
+    csv_files = []
+    for root, dirs, files in os.walk(download_dir):
+        for file in files:
+            if file.endswith('.csv.gz'):
+                csv_files.append(os.path.join(root, file))
+    return sorted(csv_files)
+
+
+def concatenate_csv_files(csv_files, output_file):
+    """Concatenate CSV files in order, preserving headers."""
+    import gzip
+    
+    print(f"\nConcatenating {len(csv_files)} CSV files...")
+    
+    with gzip.open(output_file, 'wt') as outf:
+        header_written = False
+        
+        for i, csv_file in enumerate(csv_files, 1):
+            print(f"  [{i}/{len(csv_files)}] Processing {os.path.basename(csv_file)}")
+            
+            with gzip.open(csv_file, 'rt') as inf:
+                lines = inf.readlines()
+                
+                if not header_written:
+                    # Write header from first file
+                    outf.writelines(lines)
+                    header_written = True
+                else:
+                    # Skip header for subsequent files
+                    outf.writelines(lines[1:])
+    
+    print(f"\n✓ Concatenated CSV saved to: {output_file}")
+    
+    # Show file size
+    size_mb = os.path.getsize(output_file) / (1024 * 1024)
+    print(f"  Size: {size_mb:.1f} MB")
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description='Download and concatenate artifacts from workflow runs'
+    )
+    parser.add_argument(
+        'runs_file',
+        help='JSON file containing run IDs (from run_historical_adsb_action.py)'
+    )
+    parser.add_argument(
+        '--output-dir',
+        default='./downloads/historical_concat',
+        help='Directory for downloads (default: ./downloads/historical_concat)'
+    )
+    parser.add_argument(
+        '--wait',
+        action='store_true',
+        help='Wait for workflows to complete before downloading'
+    )
+    
+    args = parser.parse_args()
+    
+    # Load run IDs
+    if not os.path.exists(args.runs_file):
+        print(f"Error: File not found: {args.runs_file}")
+        sys.exit(1)
+    
+    with open(args.runs_file, 'r') as f:
+        data = json.load(f)
+    
+    runs = data['runs']
+    start_date = data['start_date']
+    end_date = data['end_date']
+    
+    print("=" * 60)
+    print("Download and Concatenate Historical Artifacts")
+    print("=" * 60)
+    print(f"Date range: {start_date} to {end_date}")
+    print(f"Workflow runs: {len(runs)}")
+    print(f"Output directory: {args.output_dir}")
+    print("=" * 60)
+    
+    # Create output directory
+    os.makedirs(args.output_dir, exist_ok=True)
+    
+    # Wait for workflows to complete if requested
+    if args.wait:
+        print("\nWaiting for workflows to complete...")
+        for run_info in runs:
+            run_id = run_info['run_id']
+            print(f"  Checking run {run_id}...")
+            
+            cmd = ['gh', 'run', 'watch', str(run_id)]
+            subprocess.run(cmd)
+    
+    # Download artifacts
+    print("\nDownloading artifacts...")
+    successful_downloads = 0
+    
+    for i, run_info in enumerate(runs, 1):
+        run_id = run_info['run_id']
+        print(f"\n[{i}/{len(runs)}] Run {run_id} ({run_info['start']} to {run_info['end']})")
+        
+        if download_run_artifact(run_id, args.output_dir):
+            successful_downloads += 1
+    
+    print(f"\n\nDownload Summary: {successful_downloads}/{len(runs)} artifacts downloaded")
+    
+    if successful_downloads == 0:
+        print("\nNo artifacts downloaded. Workflows may still be running.")
+        print("Use --wait to wait for completion, or try again later.")
+        sys.exit(1)
+    
+    # Find all CSV files
+    csv_files = find_csv_files(args.output_dir)
+    
+    if not csv_files:
+        print("\nError: No CSV files found in download directory")
+        sys.exit(1)
+    
+    print(f"\nFound {len(csv_files)} CSV file(s):")
+    for csv_file in csv_files:
+        print(f"  - {os.path.basename(csv_file)}")
+    
+    # Concatenate
+    # Calculate actual end date for filename (end_date - 1 day since it's exclusive)
+    from datetime import datetime, timedelta
+    end_dt = datetime.strptime(end_date, '%Y-%m-%d') - timedelta(days=1)
+    actual_end = end_dt.strftime('%Y-%m-%d')
+    
+    output_file = os.path.join(
+        args.output_dir,
+        f"openairframes_adsb_{start_date}_{actual_end}.csv.gz"
+    )
+    
+    concatenate_csv_files(csv_files, output_file)
+    
+    print("\n" + "=" * 60)
+    print("Done!")
+    print("=" * 60)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/scripts/run_historical_adsb_action.py b/scripts/run_historical_adsb_action.py
index 3ed649a..4a17c76 100644
--- a/scripts/run_historical_adsb_action.py
+++ b/scripts/run_historical_adsb_action.py
@@ -38,7 +38,7 @@ def generate_date_chunks(start_date_str, end_date_str, chunk_days=15):
     return chunks
 
 
-def trigger_workflow(start_date, end_date, chunk_days=3, branch='main', dry_run=False):
+def trigger_workflow(start_date, end_date, chunk_days=1, branch='main', dry_run=False):
     """Trigger the historical-adsb workflow via GitHub CLI."""
     cmd = [
         'gh', 'workflow', 'run', 'historical-adsb.yaml',
@@ -50,18 +50,36 @@ def trigger_workflow(start_date, end_date, chunk_days=3, branch='main', dry_run=
     
     if dry_run:
         print(f"[DRY RUN] Would run: {' '.join(cmd)}")
-        return True
+        return True, None
     
     print(f"Triggering workflow: {start_date} to {end_date} (on {branch})")
     result = subprocess.run(cmd, capture_output=True, text=True)
     
     if result.returncode == 0:
         print(f"✓ Successfully triggered workflow for {start_date} to {end_date}")
-        return True
+        
+        # Get the run ID of the workflow we just triggered
+        # Wait a moment for it to appear
+        import time
+        time.sleep(2)
+        
+        # Get the most recent run (should be the one we just triggered)
+        list_cmd = [
+            'gh', 'run', 'list',
+            '--workflow', 'historical-adsb.yaml',
+            '--branch', branch,
+            '--limit', '1',
+            '--json', 'databaseId',
+            '--jq', '.[0].databaseId'
+        ]
+        list_result = subprocess.run(list_cmd, capture_output=True, text=True)
+        run_id = list_result.stdout.strip() if list_result.returncode == 0 else None
+        
+        return True, run_id
     else:
         print(f"✗ Failed to trigger workflow for {start_date} to {end_date}")
         print(f"Error: {result.stderr}")
-        return False
+        return False, None
 
 
 def main():
@@ -81,8 +99,8 @@ def main():
     parser.add_argument(
         '--chunk-days',
         type=int,
-        default=3,
-        help='Days per job chunk within each workflow run (default: 3)'
+        default=1,
+        help='Days per job chunk within each workflow run (default: 1)'
     )
     parser.add_argument(
         '--workflow-chunk-days',
@@ -139,18 +157,27 @@ def main():
     # Trigger workflows
     import time
     success_count = 0
+    triggered_runs = []
     
     for i, chunk in enumerate(chunks, 1):
         print(f"\n[{i}/{len(chunks)}] ", end='')
         
-        if trigger_workflow(
+        success, run_id = trigger_workflow(
             chunk['start'],
             chunk['end'],
             chunk_days=args.chunk_days,
             branch=args.branch,
             dry_run=args.dry_run
-        ):
+        )
+        
+        if success:
             success_count += 1
+            if run_id:
+                triggered_runs.append({
+                    'run_id': run_id,
+                    'start': chunk['start'],
+                    'end': chunk['end']
+                })
         
         # Add delay between triggers (except for last one)
         if i < len(chunks) and not args.dry_run:
@@ -158,6 +185,22 @@ def main():
     
     print(f"\n\nSummary: {success_count}/{len(chunks)} workflows triggered successfully")
     
+    # Save triggered run IDs to a file
+    if triggered_runs and not args.dry_run:
+        import json
+        timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
+        runs_file = f"./triggered_runs_{timestamp}.json"
+        with open(runs_file, 'w') as f:
+            json.dump({
+                'start_date': args.start_date,
+                'end_date': args.end_date,
+                'branch': args.branch,
+                'runs': triggered_runs
+            }, f, indent=2)
+        print(f"\nRun IDs saved to: {runs_file}")
+        print(f"\nTo download and concatenate these artifacts, run:")
+        print(f"  python scripts/download_and_concat_runs.py {runs_file}")
+    
     if success_count < len(chunks):
         sys.exit(1)